GNFAC Advisory Podcast https://www.mtavalanche.com/advisory/feed The daily Avalanche Advisory issued by the Gallatin National Forest Avalanche Center. en GNFAC Avalanche Advisory for Mon Dec 18, 2017 https://www.mtavalanche.com/advisory/17/12/18 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Mon Dec 18, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/1183" typeof="schema:Person" property="schema:name" datatype="">Alex Marienthal</span></span> <span class="field field--name-created field--type-created field--label-hidden">Mon, 12/18/2017 - 06:32</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-18-06-29-38.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-18-06-29-38.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Alex Marienthal with the Gallatin National Forest Avalanche Advisory issued on Monday, December 18<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <a href="http://yellowstoneclubfoundation.org/"><strong>Yellowstone Club Community Foundation</strong></a><strong> </strong>and <a href="http://www.montanaaleworks.com"><strong>Montana Ale Works</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>Since yesterday the mountains near Cooke City got 2” of new snow, near West Yellowstone got 1”, and elsewhere got maybe a trace. Temperatures this morning are high 20s F near Bozeman and Big Sky and single digits to teens F near West Yellowstone and Cooke City. Wind is west-southwest at 25-40 mph near Bozeman and Big Sky, and 10-20 mph in the southern mountains. Today, temperatures will be 20s to low 30s F with west-southwest wind at 30-45 mph. Snow today will total 1-2” in most areas with 4-6” near Cooke City by morning.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Bridger Range</a></h3><h3 class ="region" ><a href="/advisory/northern-gallatin" class="advisory-region" style="color: #fafafa;">Northern Gallatin</a></h3><h3 class ="region" ><a href="/advisory/northern-madison" class="advisory-region" style="color: #fafafa;">Northern Madison</a></h3></div><p>In the mountains near Bozeman and Big Sky, strong wind yesterday morning drifted new snow into slabs 2-3 feet thick. Skiers in the Bridger Range and Hyalite easily triggered these wind slabs near ridgelines, on steep rollovers, and along the edges of cliffs (<strong><a href="https://www.mtavalanche.com/images/17/wind-slab-ridge-north-bridger">photo</a></strong>). These slabs are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> today, and large enough to carry or bury a person. Strong wind today will continue to grow wind slabs. Wind was from the northwest yesterday and changed to southwest overnight, so fresh slabs may be found in different locations than yesterday.</p> <p>On non-wind loaded slopes, dry loose avalanches and storm slabs are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> and could run far and wide where the underlying snow is weak (<strong><a href="https://youtu.be/7RTIXnPxSDQ">video</a></strong>). These avalanches will likely be small, but could knock a person over or carry them into undesirable terrain.</p> <p>Be extra cautious of wind loaded terrain today, and assess the consequences of being caught in even a small <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a>, such as being dragged through trees or over cliffs. Fresh wind slabs and recent snow make avalanches possible, and the avalanche danger today is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong>.</p><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/southern-madison" class="advisory-region" style="color: #fafafa;">Southern Madison</a></h3><h3 class ="region" ><a href="/advisory/southern-gallatin" class="advisory-region" style="color: #fafafa;">Southern Gallatin</a></h3><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Lionhead Range</a></h3><h3 class ="region" ><a href="/advisory/cooke-city" class="advisory-region" style="color: #fafafa;">Cooke City</a></h3></div><p>Near Cooke City and West Yellowstone 3-5” of low density snow fell over the weekend, and a couple inches are expected today. Strong wind will drift this snow into slabs 1-2 feet thick near ridgelines. Be cautious of these drifts, and completely avoid them where the consequences of a small <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a> could be a nasty ride through trees or over cliffs.</p> <p>On some slopes, weak facets that formed during recent high pressure are now buried by the new snow (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>). Doug was in Cooke City yesterday and found this sugary <a href="https://staging.avalanche.org/avalanche-education/weak-layer" title="A snowpack layer with less strength than adjacent layers. Often the layer in the snowpack where an avalanche fractures." class="taxonomy-tooltip-link" target="_blank">weak layer</a> below the new snow on all aspects (<strong><a href="https://www.mtavalanche.com/images/17/weak-facets-are-under-new-snow">photo</a></strong>, <strong><a href="https://youtu.be/sZxO8CPCcTk">video</a></strong>). This layer is not a major problem at the moment, but will produce avalanches when loaded with more snow or wind slabs.</p> <p>Today, fresh wind slabs are possible and the avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> on wind loaded slopes. On non-wind loaded slopes, avalanches are not likely until more snow falls and the avalanche danger today is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BOZEMAN</u></p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Today and tomorrow, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>22 and 23 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This <a href="https://backcountrymagazine.com/stories/mountain-skills-use-checklist-facilitate-better-decisions/"><b>article from Backcountry Magazine</b></a> discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Mon, 18 Dec 2017 13:32:48 +0000 Alex Marienthal 18013 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Sun Dec 17, 2017 https://www.mtavalanche.com/advisory/17/12/17 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Sun Dec 17, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/1183" typeof="schema:Person" property="schema:name" datatype="">Alex Marienthal</span></span> <span class="field field--name-created field--type-created field--label-hidden">Sun, 12/17/2017 - 06:28</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-17-06-30-56.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-17-06-30-56.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Alex Marienthal with the Gallatin National Forest Avalanche Advisory issued on Sunday, December 17<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <strong><a href="http://www.mysteryranch.com/">Mystery Ranch</a></strong> and <strong><a href="http://www.strongholdfabrication.com/">Stronghold Fabrication</a></strong>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>Since yesterday morning the mountains got 10” of low density snow in Hyalite, 3-5” in the Bridger Range and near Big Sky, and 1-2” elsewhere. Temperatures this morning are single digits to low teens F. Wind is westerly at 15-25 mph with gusts to 40 mph near Bozeman and Big Sky. Today, temperatures will be high teens to low 20s F with wind at 20-30 mph out of the west. Clear skies today will give way to increasing clouds this evening and the mountains could get 1-2” of snow by morning.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Considerable Avalanche Hazard" alt ="Considerable Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Considerable.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Bridger Range</a></h3><h3 class ="region" ><a href="/advisory/northern-gallatin" class="advisory-region" style="color: #fafafa;">Northern Gallatin</a></h3><h3 class ="region" ><a href="/advisory/northern-madison" class="advisory-region" style="color: #fafafa;">Northern Madison</a></h3></div><p>Near Bozeman and Big Sky, yesterday’s storm delivered 7-10” of low density snow equal to .3-.5” of <a href="https://www.nrcs.usda.gov/wps/portal/nrcs/detail/or/snow/?cid=nrcs142p2_046155">snow water equivalent</a> (SWE). I was in Hyalite yesterday where there was minimal wind and the main concern was soft slabs of new snow and dry loose avalanches on steep terrain (<strong><a href="https://youtu.be/7RTIXnPxSDQ">video</a></strong>). Today, strong westerly winds will drift new snow into slabs that are easy to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a>. These slabs could be 2-3 feet thick, and found near ridgelines as well as along the edges of cliffs and gullies. Avoid steep, wind-loaded terrain today.</p> <p>On non-wind loaded slopes, soft slabs of new snow and dry loose avalanches are possible. These avalanches could run far and wide in very steep terrain, and on slopes where the previous snow surface is weak. On some slopes the new snow buried weak facets that formed during recent high pressure (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>, <a href="https://www.mtavalanche.com/images/17/unstable-test-results-west-side-bridgers"><strong>photo</strong></a>, <a href="https://www.youtube.com/watch?v=b30nRjneTlE"><strong>video</strong></a>). Watch for signs of instability such as cracking and collapsing, and avoid slopes similar to where these signs are present.</p> <p>Today, fresh wind slabs are easy to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> and the avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #f8931d; font-weight: bolder;"><span class = "avayhzrd-considerable">CONSIDERABLE</span></span></a></strong> on wind loaded slopes and <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> on all other slopes.</p><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/southern-madison" class="advisory-region" style="color: #fafafa;">Southern Madison</a></h3><h3 class ="region" ><a href="/advisory/southern-gallatin" class="advisory-region" style="color: #fafafa;">Southern Gallatin</a></h3><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Lionhead Range</a></h3><h3 class ="region" ><a href="/advisory/cooke-city" class="advisory-region" style="color: #fafafa;">Cooke City</a></h3></div><p>The mountains near West Yellowstone and Cooke City got 2-3” of low density snow yesterday. Moderate westerly winds will drift this snow into slabs up to a foot thick that are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> today. These slabs are most likely found near ridgelines. Evaluate terrain for the consequences of being caught in even a small <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a>. Approach wind loaded slopes with caution or avoid them altogether.</p> <p>On non-wind loaded slopes the snowpack is generally stable and avalanches are not likely. The recent snow buried weak layers on some slopes, which will be a future problem, but pose minimal threat today without a significant load (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>, <strong><a href="https://www.mtavalanche.com/images/17/thin-and-faceted-pika-point">photo</a></strong>). Today, the avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> on wind loaded slopes and <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong> on non-wind loaded slopes.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BOZEMAN</u></p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Today and tomorrow, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>22 and 23 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This <a href="https://backcountrymagazine.com/stories/mountain-skills-use-checklist-facilitate-better-decisions/"><b><span style="font-family:&quot;Times New Roman&quot;,serif">article from Backcountry Magazine</span></b></a> discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Sun, 17 Dec 2017 13:28:15 +0000 Alex Marienthal 18004 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Sat Dec 16, 2017 https://www.mtavalanche.com/advisory/17/12/16 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Sat Dec 16, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/126" typeof="schema:Person" property="schema:name" datatype="">Eric Knoff</span></span> <span class="field field--name-created field--type-created field--label-hidden">Sat, 12/16/2017 - 06:29</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-16-06-23-11.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-16-06-23-11.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Eric Knoff with the Gallatin National Forest Avalanche Advisory issued on Saturday, December 16<sup>th</sup> at 6:30 a.m. Today’s advisory is sponsored by <a href="http://homeinbigsky.com/?page_id=230"><strong>Knoff Group Real Estate</strong></a><strong> </strong>and <a href="http://www.yellowstoneskitours.com/"><strong>Yellowstone Ski Tours</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>At 5 a.m. the mountains have picked up 2-3” of new snow. Currently, it’s still snowing lightly and temperatures are in the teens to low 20’s F. Winds are blowing 5-15 mph out of the west. Today, snow will continue through the morning hours and the mountains will pick up an additional 1-3” by this afternoon. Skies begin to clear later in the day and temps will warm into the 20’s F. Winds will continue to blow 5-15 mph out of the west. No snow is expected tonight through tomorrow.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" >All Regions</h3></div><p>This storm looks to be weaker than originally forecasted. By the time it’s over, the mountains will likely pick up 3-5” of low density snow. This won’t add a significant amount of stress to the snowpack, but it will be enough produce heightened avalanche conditions. On some slopes, the new snow is being deposited on a <a href="https://staging.avalanche.org/avalanche-education/weak-layer" title="A snowpack layer with less strength than adjacent layers. Often the layer in the snowpack where an avalanche fractures." class="taxonomy-tooltip-link" target="_blank">weak layer</a> of near surface facets that formed during the recent high pressure. Alex and I found this layer on the west side of the Bridger Range (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>, <a href="https://www.youtube.com/watch?v=b30nRjneTlE"><strong>video</strong></a>) and I also found it in the Lionhead area near West Yellowstone yesterday. It’s safe to say this <a href="https://staging.avalanche.org/avalanche-education/persistent-weak-layer" title="Weak layers that continue to produce avalanches for several days or weeks after a storm." class="taxonomy-tooltip-link" target="_blank">persistent weak layer</a> exists throughout the advisory area (<a href="https://www.mtavalanche.com/images/17/unstable-test-results-west-side-bridgers"><strong>photo</strong></a>).</p> <p>Today, human triggered avalanches will be possible on wind loaded and non-wind loaded slopes. In areas where the new snow has been deposited over a weak old snow surface, it will be possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> small soft <a href="https://staging.avalanche.org/avalanche-education/slab" title="A relatively cohesive snowpack layer." class="taxonomy-tooltip-link" target="_blank">slab</a> avalanches in steeper terrain. These slides won’t carry a tremendous amount of volume, but they could easily catch and carry a skier or rider into unfavorable terrain. Watch for signs of instability such as cracking/collapsing and avoid slopes where these signs are present.</p> <p>Fortunately, this storm did not arrive with a heavy amount of wind, so <a href="https://staging.avalanche.org/avalanche-education/wind-loading" title="The added weight of wind drifted snow." class="taxonomy-tooltip-link" target="_blank">wind loading</a> won’t be a major concern. There will be small isolated wind slabs near the ridgelines, but these should be easy to recognize and avoid. In the Bridger Range, wind slabs that formed prior to this storm could still be a problem. On Thursday, a skier triggered a <a href="https://staging.avalanche.org/avalanche-education/wind-slab" title="A cohesive layer of snow formed when wind deposits snow onto leeward terrain. Wind slabs are often smooth and rounded and sometimes sound hollow. " class="taxonomy-tooltip-link" target="_blank">wind slab</a> on the Football Field south of Bridger Bowl that ran over the cliffs hundreds of feet below. Today, these older slabs should be more stubborn, but they’re something to keep in mind when traveling in the backcountry around the Bridgers. In all areas, manage you’re terrain carefully.</p> <p>Today, human triggered avalanches are possible and the avalanche danger is rated <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong>.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <h3><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></h3> <p><u>BOZEMAN</u></p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Today and tomorrow, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>Today,<strong> Avalanche Rescue</strong>, 10-2 on @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This <a href="https://backcountrymagazine.com/stories/mountain-skills-use-checklist-facilitate-better-decisions/">article from Backcountry Magazine</a> discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Sat, 16 Dec 2017 13:29:59 +0000 Eric Knoff 17997 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Fri Dec 15, 2017 https://www.mtavalanche.com/advisory/17/12/15 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Fri Dec 15, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/1183" typeof="schema:Person" property="schema:name" datatype="">Alex Marienthal</span></span> <span class="field field--name-created field--type-created field--label-hidden">Fri, 12/15/2017 - 06:47</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-15-06-42-36.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-15-06-42-36.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Alex Marienthal with the Gallatin National Forest Avalanche Advisory issued on Friday, December 15<sup>th</sup> at 7:00 a.m. Today’s advisory is sponsored by <a href="http://www.worldboards.com"><strong>World Boards</strong></a><strong> </strong>and <a href="http://stateparks.mt.gov/"><strong>Montana State Parks</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>The mountains did not get any snow since yesterday morning. Wind has been out of the west-northwest in the northern ranges and Cooke City, and out of the west-southwest near West Yellowstone, with speeds of 15-25 mph and gusts to 40 mph. Temperatures this morning are single digits to teens F in the southern ranges, and high 20s F near Bozeman and Big Sky. Today, temperatures will be high 20s to mid-30s F with west-northwest wind at 20-30 mph. A cold front tonight will bring temperatures in the low teens F, and the mountains will get 3-5” of snow by morning with another 3-5” through tomorrow.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Bridger Range</a></h3></div><p>Yesterday, strong wind in the Bridger Range drifted 2” of new snow into slabs 6-12” thick. Ski patrol easily triggered these slabs on mid-elevation terrain, at the bottom of cliffs and on steep rollovers. A skier triggered a soft <a href="https://staging.avalanche.org/avalanche-education/slab" title="A relatively cohesive snowpack layer." class="taxonomy-tooltip-link" target="_blank">slab</a> on the Football Field just south of Bridger Bowl’s boundary, which ran over the cliffs and left him wide eyed. These soft slabs are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> today. Carefully evaluate recently wind loaded terrain, and assess the terrain for consequences of being caught in even a small <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a>.</p> <p>Eric and I visited the west side of the Bridger Range on Wednesday where we found weak, sugary facets at the surface that will be a problem when capped with more snow (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>, <a href="https://www.youtube.com/watch?v=b30nRjneTlE"><strong>video</strong></a>). I went to the west side again yesterday and was surprised to find a slope with weak facets below the thanksgiving crust, which produced unstable test results (<strong><a href="https://www.mtavalanche.com/images/17/unstable-test-results-west-side-bridgers">photo</a></strong>, <strong><a href="https://www.mtavalanche.com/images/17/west-side-bridger-profile-14-dec">snowpit</a></strong>). Isolated areas of unstable snow exist, especially on the complex terrain of the west side, and give reason to dig before riding steep terrain (<a href="https://youtu.be/io32nxnei0c"><strong>video</strong></a>).</p> <p>Small wind slabs are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> today and the avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> on wind loaded slopes. Otherwise, the snowpack is generally stable and avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong> on non-wind loaded slopes.</p><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/northern-gallatin" class="advisory-region" style="color: #fafafa;">Gallatin Range</a></h3><h3 class ="region" ><a href="/advisory/northern-madison" class="advisory-region" style="color: #fafafa;">Madison Range</a></h3><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Lionhead Range</a></h3><h3 class ="region" ><a href="/advisory/cooke-city" class="advisory-region" style="color: #fafafa;">Cooke City</a></h3></div><p>Moderate wind and only a couple inches of fresh snow will not increase the avalanche danger today. The snowpack is mostly stable, and avalanches are difficult to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a>. Small, isolated wind slabs may be found near ridgelines, and will pose minimal threat unless they are triggered in steep, high consequence terrain.</p> <p>The main concern is weak facets that just got capped by a couple inches of snow (<a href="https://www.mtavalanche.com/images/17/small-faceted-grains"><strong>photo</strong></a>). Doug found this layer in the Taylor Fork on Wednesday (<a href="https://www.mtavalanche.com/images/17/thin-and-faceted-pika-point"><strong>photo</strong></a>), and we suspect it exists on slopes throughout the advisory area. Although this layer is not creating widespread instability at the moment, it will be something to pay close attention to as more snow falls this weekend.</p> <p>Today, generally safe avalanche conditions exist and avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BOZEMAN</u></p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Today and tomorrow, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This <a href="https://backcountrymagazine.com/stories/mountain-skills-use-checklist-facilitate-better-decisions/"><b>article from Backcountry Magazine</b></a> discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Fri, 15 Dec 2017 13:47:28 +0000 Alex Marienthal 17994 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Thu Dec 14, 2017 https://www.mtavalanche.com/advisory/17/12/14 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Thu Dec 14, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/126" typeof="schema:Person" property="schema:name" datatype="">Eric Knoff</span></span> <span class="field field--name-created field--type-created field--label-hidden">Thu, 12/14/2017 - 06:32</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-14-06-26-36.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-14-06-26-36.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Eric Knoff with the Gallatin National Forest Avalanche Advisory issued on Thursday, December 14<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored <strong><a href="http://alpineorthopedics.com/">Alpine Orthopedics</a></strong> and <strong><a href="https://highline-partners.com/">Highline Partners</a></strong>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>Over the past 24 hours the mountains picked up 1-2” of new snow. At 5 a.m. snow has moved out of the region and skies have become partly cloudy. Temperatures are in the teens to low 20’s F and winds are blowing 10-20 mph out of the W-NW. Today, a weak ridge of high pressure builds over the area producing clear skies and fairly calm conditions. Temperatures will warm into the mid to upper 20’s and winds will remain light to moderate out of the W-NW. No snow is expected over the next 24 hours, but there will be an increasing chance of snow Friday night into Saturday.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" >All Regions</h3></div><p>Yesterday’s storm was unusual. The valleys picked up just as much snow as the mountains, if not more. Despite this fact, it was nice to see the white stuff fall. While this welcomed shot of snow improved skiing and riding conditions, it did little to heighten the avalanche danger.</p> <p>Snow totals were 1-2”, which did not add a significant load to our snowpack. Today, there will be small isolated wind slabs near the ridgelines that formed from moderate west-northwest winds. These small slabs could be touchy if resting over a thin layer of near surface facets. However, these fresh slabs should only be 4-6” thick and pose little threat unless triggered in steep, high consequence terrain. Outside of small, isolated wind slabs the snowpack is generally stable (<a href="https://youtu.be/io32nxnei0c"><strong>video</strong></a>).</p> <p>The main concern now is the layer of near surface facets that got capped by the new snow (<strong><a href="https://www.mtavalanche.com/images/17/small-faceted-grains">photo</a></strong>). Yesterday, I found this layer to be well developed on the west side of the Bridger Range (<strong><a href="https://www.youtube.com/watch?v=b30nRjneTlE">video</a></strong>) and Doug found this layer in the Taylor Fork (<strong><a href="https://www.mtavalanche.com/images/17/thin-and-faceted-pika-point">photo</a></strong>). We do not have a complete record of where this layer exists, but it’s safe to say it can be found in all mountain ranges. Its distribution may be dependent on <a href="https://staging.avalanche.org/avalanche-education/aspect" title="The compass direction a slope faces (i.e. North, South, East, or West.)" class="taxonomy-tooltip-link" target="_blank">aspect</a> and elevation and we’ll be tracking it as we spend more time in the field. Although this layer is not creating widespread instability at the moment, it will be something to pay close attention to as more snow falls this weekend.</p> <p>Yesterday’s snowfall did not add significant stress to the snowpack. For this reason generally safe avalanche conditions exist and the avalanche danger is rated <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.<strong> </strong></p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p> <div> <hr /></div><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <h3><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></h3> <p><u>BOZEMAN</u></p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Today and tomorrow, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This article from Backcountry Magazine discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Thu, 14 Dec 2017 13:32:31 +0000 Eric Knoff 17989 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Wed Dec 13, 2017 https://www.mtavalanche.com/advisory/17/12/13 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Wed Dec 13, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/124" typeof="schema:Person" property="schema:name" datatype="">Doug Chabot</span></span> <span class="field field--name-created field--type-created field--label-hidden">Wed, 12/13/2017 - 06:36</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-13-06-10-06.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-13-06-10-06.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Doug Chabot with the Gallatin National Forest Avalanche Advisory issued on Wednesday, December 13<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <a href="http://www.mysteryranch.com/"><strong>Mystery Ranch</strong></a><strong> </strong>and <a href="https://www.bozo.coop"><strong>Community Food Co-op</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>At 5 a.m. under clear skies there’s no new snow, mountain temperatures are in the mid-20s and winds are blowing W-NW at 20-30 mph. It’s been eight days since snow fell in the northern ranges and five days in the south, but that’s about to change. A fast moving snow storm around noon will freshen up the mountains with 2-3” of snow by tonight. Winds will remain out of the W-NW at 20 mph with gusts of 40 mph during the storm. Clear weather returns tomorrow with more snow showers on Friday.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" >All Regions</h3></div><p>The snowpack is generally stable and the last reported avalanches were on Friday when ski patrols triggered small wind slabs. The backcountry only had a few wet sluffs on south-facing slopes. The snow depth varies from 5-6’ around Cooke City to 2.5’ in the northern mountains with all ranges harboring an ice crust that formed during Thanksgiving. In the absence of obvious signs of instability (cracking, collapsing or avalanches) we recommend digging and testing to this ice layer as a final step before dropping into avalanche terrain (<a href="https://www.mtavalanche.com/images/17/dig-thanksgiving-crust"><strong>photo</strong></a>, <a href="https://youtu.be/io32nxnei0c"><strong>video</strong></a>). On Monday in Hyalite my partner and I found stable conditions on the approach to Divide Peak and also in our <a href="https://staging.avalanche.org/avalanche-education/snowpit" title="A pit dug vertically into the snowpack where snow layering is observed and stability tests may be performed. Also called a snow profile." class="taxonomy-tooltip-link" target="_blank">snowpit</a> (<strong><a href="https://www.mtavalanche.com/images/17/divide-peak-pit-profile">profile</a></strong>).</p> <p>If today’s storm arrives as expected, backcountry skiing and riding will improve but there will be a price to pay in the form of wind-<a href="https://staging.avalanche.org/avalanche-education/loading" title="The addition of weight on top of a snowpack, usually from precipitation, wind drifting, or a person." class="taxonomy-tooltip-link" target="_blank">loading</a> and burying a new <a href="https://staging.avalanche.org/avalanche-education/weak-layer" title="A snowpack layer with less strength than adjacent layers. Often the layer in the snowpack where an avalanche fractures." class="taxonomy-tooltip-link" target="_blank">weak layer</a>. A few inches of snow and wind may create 6-12” wind slabs at the ridgelines that could be triggered during and immediately after the storm. Additionally, the last 8 days of high pressure created a layer of small-grained facets (weak snow) at the surface which will get buried and cause avalanches in the future (<strong><a href="https://www.mtavalanche.com/images/17/small-faceted-grains">photo</a></strong>). This layer is not widespread, but once buried it will require a bit of hunting to find. Stay tuned.</p> <p>For today, the avalanche danger is starting out as <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a>, </strong>but could rise with today’s snowfall.<strong> </strong></p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BOZEMAN</u></p> <p><strong>TONIGHT</strong>, Dec. 13, <strong>Avalanche Awareness</strong>, 6:30-8 p.m. at Gallatin Valley Snowmobile Association, 4-Corners</p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Dec. 14 and 15, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p class="MsoNormal">A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. 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font-size:11.0pt; font-family:"Calibri",sans-serif;} </style> <![endif]--></p> </div> </div> </div> </div> Wed, 13 Dec 2017 13:36:27 +0000 Doug Chabot 17984 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Tue Dec 12, 2017 https://www.mtavalanche.com/advisory/17/12/12 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Tue Dec 12, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/124" typeof="schema:Person" property="schema:name" datatype="">Doug Chabot</span></span> <span class="field field--name-created field--type-created field--label-hidden">Tue, 12/12/2017 - 06:39</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-12-06-35-49.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-12-06-35-49.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Doug Chabot with the Gallatin National Forest Avalanche Advisory issued on Tuesday, December 12<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <a href="https://www.edwardjones.com/en_US/fa/index.html&amp;CIRN=520762"><strong>Edward Jones</strong></a><strong> </strong>and <a href="http://www.thebountifultable.com/"><strong>Bountiful Table</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>We are hostages under an oppressive regime of high pressure. There’s no new snow, winds are west at 10-20 mph and an inversion has created above freezing temperatures at the ridgetops and low 20s in the valleys. West Yellowstone and Cooke City have been spared the inversion, but will not escape the warm temperatures which will reach the low 40s everywhere. A slow change back to winter begins on Friday, so don’t despair.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" >All Regions</h3></div><p>There’s been no new snow, no wind-<a href="https://staging.avalanche.org/avalanche-education/loading" title="The addition of weight on top of a snowpack, usually from precipitation, wind drifting, or a person." class="taxonomy-tooltip-link" target="_blank">loading</a> and no recent avalanches. We have no reports of cracking or collapsing and <a href="https://staging.avalanche.org/avalanche-education/stability" title="The chance that an avalanche will not occur, relative to a given trigger (usually the weight of a human). " class="taxonomy-tooltip-link" target="_blank">stability</a> tests are benign. The snowpack is generally stable. Buried 1-2’ deep is an ice crust that formed during Thanksgiving that we are using as a visual marker in the snow (<a href="https://www.mtavalanche.com/images/17/dig-thanksgiving-crust"><strong>photo</strong></a>). Isolated instabilities (i.e. <a href="https://staging.avalanche.org/avalanche-education/wind-slab" title="A cohesive layer of snow formed when wind deposits snow onto leeward terrain. Wind slabs are often smooth and rounded and sometimes sound hollow. " class="taxonomy-tooltip-link" target="_blank">wind slab</a>) would be found above this layer so we recommend digging to the crust and testing the snow, even during a low danger. Yesterday my partner and I skied Divide Peak up Hyalite and did a few <a href="https://staging.avalanche.org/avalanche-education/stability" title="The chance that an avalanche will not occur, relative to a given trigger (usually the weight of a human). " class="taxonomy-tooltip-link" target="_blank">stability</a> tests, which did not dissuade us from skiing our line (<a href="https://youtu.be/io32nxnei0c"><strong>video</strong></a>, <strong><a href="https://www.mtavalanche.com/images/17/divide-peak-pit-profile">snowpit</a></strong>).</p> <p>It did not freeze at the ridgetops last night and may not for a couple more days. The mountains around Cooke City and West Yellowstone have below freezing temperatures this morning, but will warm this afternoon. Across our forecast area the snow surface will get moist on sunny slopes and I expect to see pinwheels rolling off steep slopes along with a few small, wet loose avalanches (<strong><a href="https://www.mtavalanche.com/images/17/wet-loose-cooke-city">photo</a></strong>, <strong><a href="https://www.mtavalanche.com/images/17/small-wet-loose-slides-beehive">photo</a></strong>). While seemingly inconsequential, a small wet <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a> could push a skier off a cliff or into other high consequence terrain.</p> <p>For today, the avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>. But as stated above, be wary of wet avalanches on sunny slopes and dig to the ice crust before committing to avalanche terrain.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BILLINGS</u></p> <p><strong>TONIGHT</strong>, Dec. 12, <strong>Avalanche Awareness for Snowmobilers</strong>, 6-7:30 p.m. at Red Lion Hotel and Convention Center, Billings</p> <p><u>BOZEMAN</u></p> <p>Dec. 13, <strong>Avalanche Awareness</strong>, 6:30-8 p.m. at Gallatin Valley Snowmobile Association, 4-Corners</p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Dec. 14 and 15, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p>Jan. 6, <strong>Avalanche Awareness,</strong> 7-8 p.m. at West Yellowstone Holiday Inn Conference Center</p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p class="MsoNormal"><u><span style="color:blue"><p></p></span></u><!--[if !mso]> <style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style> <![endif]--></p> <p class="MsoNormal">A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. 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font-size:11.0pt; font-family:"Calibri",sans-serif;} </style> <![endif]--></p> </div> </div> </div> </div> Tue, 12 Dec 2017 13:39:31 +0000 Doug Chabot 17980 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Mon Dec 11, 2017 https://www.mtavalanche.com/advisory/17/12/11 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Mon Dec 11, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/1183" typeof="schema:Person" property="schema:name" datatype="">Alex Marienthal</span></span> <span class="field field--name-created field--type-created field--label-hidden">Mon, 12/11/2017 - 06:48</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-11-06-42-09.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-11-06-42-09.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Alex Marienthal with the Gallatin National Forest Avalanche Advisory issued on Monday, December 11<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <a href="http://www.sparkrandd.com/"><strong>Spark R&amp;D</strong></a><strong> </strong>and <a href="http://gvsa.net/"><strong>Gallatin Valley Snowmobile Association</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>Under clear skies this morning, temperatures are high 20s to low 30s F near ridgelines and 10-15 degrees colder in valleys. Wind is west-northwest at 15-25 mph in the northern ranges and Cooke City, and 5-15 mph elsewhere. Dry conditions will prevail today under mostly sunny skies. Temperatures will be 30s to low 40s F with west-northwest wind at 10-25 mph. There is a small chance for snow showers near Big Sky and Cooke City on Wednesday, and a better chance for snow for the entire advisory area Friday night through the weekend.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" >All Regions</h3></div><p>Last week, strong wind in the Bridger Range drifted snow into slabs below ridgelines and across mid-elevations along the edges of ridges and gullies (<strong><a href="https://www.mtavalanche.com/images/17/cross-loaded-terrain-saddle-peak">photo</a></strong>). Bridger Bowl Ski Patrol easily triggered these 1-3 foot thick slabs with explosives through last Friday. A couple warm days without load from snow and wind allowed these slabs to become stubborn and unlikely to break under the weight of a skier or rider. Although difficult to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a>, it is not impossible in steep terrain. Avoid drifts of snow on steep slopes or approach them with extra caution, especially where the consequences of a <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a> are high, like above cliffs (<strong><a href="https://www.mtavalanche.com/images/17/cross-loaded-terrain-saddle-peak">photo</a></strong>). Outside of the Bridger Range, small wind slabs near ridgelines are possible to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> and should be approached with caution.</p> <p>Aside from wind slabs, the snowpack is generally stable throughout the advisory area. There is a low possibility for snow from last week to <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a> on a layer of facets near the crust that formed during Thanksgiving. Dig 1-2 feet deep to assess the interface between the crust and last week’s snow before riding anything steep.</p> <p>Aside from small and difficult to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> wind slabs today, a generally stable snowpack exists and avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.</p> <p>Today’s snow surface is next week’s <a href="https://staging.avalanche.org/avalanche-education/weak-layer" title="A snowpack layer with less strength than adjacent layers. Often the layer in the snowpack where an avalanche fractures." class="taxonomy-tooltip-link" target="_blank">weak layer</a>. The current ridge of high pressure contributes to current good <a href="https://staging.avalanche.org/avalanche-education/stability" title="The chance that an avalanche will not occur, relative to a given trigger (usually the weight of a human). " class="taxonomy-tooltip-link" target="_blank">stability</a>, but leaves future <a href="https://staging.avalanche.org/avalanche-education/stability" title="The chance that an avalanche will not occur, relative to a given trigger (usually the weight of a human). " class="taxonomy-tooltip-link" target="_blank">stability</a> to question. Cold nights and clear skies create a strong <a href="https://staging.avalanche.org/avalanche-education/temperature-gradient" title="The change in temperature over snowpack depth." class="taxonomy-tooltip-link" target="_blank">temperature gradient</a> at the surface of the snowpack. The snow surface is much colder than snow just a few inches below, which promotes a rapid transfer of moisture between snow crystals and grows them into angular, weak, sugary facets (<strong><a href="https://www.mtavalanche.com/images/17/small-faceted-grains">photo</a></strong>). These facets will be buried by the next snowfall, and we will have to be cautious and carefully assess <a href="https://staging.avalanche.org/avalanche-education/stability" title="The chance that an avalanche will not occur, relative to a given trigger (usually the weight of a human). " class="taxonomy-tooltip-link" target="_blank">stability</a> before venturing into avalanche terrain. Feathery, <a href="https://staging.avalanche.org/avalanche-education/surface-hoar" title="Featherly crystals that form on the snow surface during clear and calm conditions - essentially frozen dew. Forms a persistent weak layer once buried." class="taxonomy-tooltip-link" target="_blank">surface hoar</a> crystals also formed during these cold, clear nights and will pose a threat when buried (<strong><a href="https://www.mtavalanche.com/images/17/surface-hoar-hyalite-0">photo</a></strong>).</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BILLINGS</u></p> <p>Dec. 12, <strong>Avalanche Awareness for Snowmobilers</strong>, 6-7:30 p.m. at Red Lion Hotel and Convention Center, Billings</p> <p><u>BOZEMAN</u></p> <p>Dec. 13, <strong>Avalanche Awareness</strong>, 6:30-8 p.m. at Gallatin Valley Snowmobile Association, 4-Corners</p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Dec. 14 and 15, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road.</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>A daily checklist is a great way to help prevent common mistakes or overlooking important data when travelling in the backcountry. This <b><a href="https://backcountrymagazine.com/stories/mountain-skills-use-checklist-facilitate-better-decisions/">article from Backcountry Magazine</a></b> discusses how to use and create your own backcountry checklist.</p> </div> </div> </div> </div> Mon, 11 Dec 2017 13:48:59 +0000 Alex Marienthal 17974 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Sun Dec 10, 2017 https://www.mtavalanche.com/advisory/17/12/10 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Sun Dec 10, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/1183" typeof="schema:Person" property="schema:name" datatype="">Alex Marienthal</span></span> <span class="field field--name-created field--type-created field--label-hidden">Sun, 12/10/2017 - 06:29</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-10-06-26-18.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-10-06-26-18.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Alex Marienthal with the Gallatin National Forest Avalanche Advisory issued on Sunday, December 10<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <a href="http://bearclawsalesandservice.com/"><strong>Cooke City Super 8/Bearclaw Bob’s</strong></a><strong> </strong>and <a href="http://bridgerbowl.com/"><strong>Bridger Bowl</strong></a>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>This morning, temperatures are high 20s to low 30s F in the mountains and 5-10 degrees colder in the valleys. Wind is west-northwest at 15-25 mph with gusts near Bozeman and Big Sky up to 35 mph. Today, temperatures will reach the high 30s to low 40s F, and wind will be west-northwest at 15-25 mph near Bozeman and 5-15 mph elsewhere. A strong ridge of high pressure continues to block precipitation this week. Late this week, a shift to cooler, unsettled weather will bring a chance for snow next weekend.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Bridger Range</a></h3></div><p>Strong cross-slope winds last week, and strong downslope winds prior to yesterday, drifted snow into slabs in unusual locations in the Bridger Range. Wind slabs one to two feet deep are located below ridgelines and across mid-elevation terrain. Carefully assess terrain for the presence of hard, thick drifts of snow, and avoid these features today. Less wind and limited snow transport yesterday allowed these slabs to gain strength, and they will be difficult to <a href="https://staging.avalanche.org/avalanche-education/trigger" title="A disturbance that initiates fracture within the weak layer causing an avalanche. In 90 percent of avalanche accidents, the victim or someone in the victims party triggers the avalanche." class="taxonomy-tooltip-link" target="_blank">trigger</a> today, but remain possible. Today, avalanche danger is <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> on wind loaded slopes and <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a> </strong>on all other slopes.</p><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/northern-gallatin" class="advisory-region" style="color: #fafafa;">Gallatin Range</a></h3><h3 class ="region" ><a href="/advisory/northern-madison" class="advisory-region" style="color: #fafafa;">Madison Range</a></h3><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Lionhead Range</a></h3><h3 class ="region" ><a href="/advisory/cooke-city" class="advisory-region" style="color: #fafafa;">Cooke City</a></h3></div><p><a>A generally stable snowpack exists, and avalanches are unlikely without recent loading from snow and wind. I found these stable conditions in Beehive on Friday (</a><a href="https://www.youtube.com/watch?v=Yyk_tDXoH0w"><strong>video</strong></a>), and Doug and Eric had similar findings in Hyalite on Thursday (<a href="https://www.youtube.com/watch?v=RqIx4CG5zrM"><strong>video</strong></a>). Watch for isolated wind slabs, and assess terrain for the consequences of being caught in even a small <a href="https://staging.avalanche.org/avalanche-education/slide" title="A mass of snow sliding, tumbling, or flowing down an inclined surface. Same as avalanche." class="taxonomy-tooltip-link" target="_blank">slide</a>.</p> <p>Small wet loose avalanches were observed during the heat of the day on Friday (<a href="https://www.mtavalanche.com/images/17/small-wet-loose-slides-beehive"><strong>photo</strong></a>, <a href="https://www.mtavalanche.com/images/17/wet-loose-cooke-city"><strong>photo</strong></a>), and are possible today. Sunny slopes will have a firm crust on the surface this morning, which will inhibit wet avalanche activity. If this crust softens, be cautious of small wet loose slides on sunny slopes this afternoon.</p> <p>Conditions are generally stable, but it is important to continue safe travel habits. Expose no more than one person at a time to avalanche terrain. Practice clear communication and identifying safe zones. Take time to practice with your rescue gear.</p> <p>Today, a generally stable snowpack without recent snow or wind-<a href="https://staging.avalanche.org/avalanche-education/loading" title="The addition of weight on top of a snowpack, usually from precipitation, wind drifting, or a person." class="taxonomy-tooltip-link" target="_blank">loading</a> makes avalanche danger <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BILLINGS</u></p> <p>Dec. 12, <strong>Avalanche Awareness for Snowmobilers</strong>, 6-7:30 p.m. at Red Lion Hotel and Convention Center, Billings</p> <p><u>BOZEMAN</u></p> <p>Dec. 13, <strong>Avalanche Awareness</strong>, 6:30-8 p.m. at Gallatin Valley Snowmobile Association, 4-Corners</p> <p>Dec. 21, <strong>Avalanche Awareness</strong>, 6-7:30 P.m. at Play It Again Sports, Bozeman</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Dec. 14 and 15, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p><u>COOKE CITY</u></p> <p>15 and 16 December, <strong>Weekly Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road.</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>Check out this <a href="https://www.facebook.com/SINTRLLC/videos/838442133011897/?hc_ref=ARQWvJo3qSSbSS2VZ4E7buhJtJcX7CjecTwjreQ6PW-4A_22MTHJ7IVOYjt5_LCfjYQ"><b><span style="font-family:&quot;Times New Roman&quot;,serif">2-minute video</span></b></a> on the snowpack. Great graphics illustrate the process of sintering and faceting. Thanks to SINTR Visual Communications!</p> </div> </div> </div> </div> Sun, 10 Dec 2017 13:29:19 +0000 Alex Marienthal 17970 at https://www.mtavalanche.com GNFAC Avalanche Advisory for Sat Dec 9, 2017 https://www.mtavalanche.com/advisory/17/12/09 <span class="field field--name-title field--type-string field--label-hidden">GNFAC Avalanche Advisory for Sat Dec 9, 2017</span> <span class="field field--name-uid field--type-entity-reference field--label-hidden"><span lang="" about="/user/126" typeof="schema:Person" property="schema:name" datatype="">Eric Knoff</span></span> <span class="field field--name-created field--type-created field--label-hidden">Sat, 12/09/2017 - 06:48</span> <div class="layout layout--onecol"> <div class="layout__region layout__region--content"> <div class="field field--name-field-audio-file field--type-file field--label-hidden field__item"><div class="audiofield"> <audio controls > <source src="https://www.mtavalanche.com/sites/default/files/audio/2017-Dec-09-06-43-45.mp3" type="audio/mpeg"> Your browser does not support the audio element. </audio> <label>2017-Dec-09-06-43-45.mp3</label> </div> </div> <div class="clearfix text-formatted field field--name-field-intro field--type-text-long field--label-hidden field__item"><p>Good Morning. This is Eric Knoff with the Gallatin National Forest Avalanche Advisory issued on Saturday, December 9<sup>th</sup> at 6:45 a.m. Today’s advisory is sponsored by <strong><a href="http://www.cookecitymotorsports.com/">Cooke City Motorsports</a></strong> and <strong><a href="http://gallatincomt.virtualtownhall.net/Public_Documents/gallatincomt_sheriff/SpecialDuties/SAR?textPage=1">Gallatin County Search and Rescue</a></strong>. This advisory does not apply to operating ski areas.</p></div> <div class="clearfix text-formatted field field--name-field-weather field--type-text-long field--label-above"> <div class="field__label">Mountain Weather</div> <div class="field__item"><p>A stagnant weather pattern is creating strong temperature inversions. This morning, valley temperatures are 10-20 degrees colder than the mountains. A 5 a.m. mountain temps range from the mid-20’s to low 30’s F under clear skies. Winds are blowing 10-25 mph out of the W-NW with ridgetop gusts pushing 30 mph. Today, high pressure remains parked over the area producing sunny skies and relatively calm conditions. This calm and clear weather pattern will exist through the weekend.</p> <div class="full-weather-wrapper "><ul class="full-weather button-list"><li><a href="/weather/wx-avalanche-log">Weather and Avalanche Log</a></li></ul></div></div> </div> <div class="discussion"><div class="field__label">Snowpack and Avalanche Discussion</div><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Moderate Avalanche Hazard" alt ="Moderate Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Moderate.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Bridger Range</a></h3></div><p>Strong downslope winds continue to produce unusual <a href="https://staging.avalanche.org/avalanche-education/loading" title="The addition of weight on top of a snowpack, usually from precipitation, wind drifting, or a person." class="taxonomy-tooltip-link" target="_blank">loading</a> patterns in the Bridge Range. Yesterday, the Bridger Bowl Ski Patrol closed sections of the Ridge due to heavy <a href="https://staging.avalanche.org/avalanche-education/wind-loading" title="The added weight of wind drifted snow." class="taxonomy-tooltip-link" target="_blank">wind loading</a> in mid-elevation terrain. Today, snow transport should be limited, but slabs that formed over the past few days will be scattered throughout the range. These slabs should be stiff and stubborn, but they could still fail under the weight of a skier or rider. Watch for and avoid thick wind drifts on the <a href="https://staging.avalanche.org/avalanche-education/leeward" title="The downwind side of an obstacle such as a ridge." class="taxonomy-tooltip-link" target="_blank">leeward</a> side of ridgelines, gullies and cross loaded terrain features.</p> <p>Today, heightened avalanche conditions exist on wind loaded slopes which have a <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #fef102; font-weight: bolder;"><span class = "avayhzrd-moderate">MODERATE</span></span></a></strong> avalanche danger. Non-wind loaded slopes have a <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong> avalanche danger.</p><div class = "region-group" > <div class = "region hazard-rating-image" ><a href ="#" title = "Low Avalanche Hazard" alt ="Low Avalanche Hazard"><img src ="/images/hazard_ratings/simple/Low.png" class = "hazard-image-main" /></a><br /></div><h3 class ="region" ><a href="/advisory/northern-gallatin" class="advisory-region" style="color: #fafafa;">Gallatin Range</a></h3><h3 class ="region" ><a href="/advisory/northern-madison" class="advisory-region" style="color: #fafafa;">Madison Range</a></h3><h3 class ="region" ><a href="/advisory/bridgers" class="advisory-region" style="color: #fafafa;">Lionhead Range</a></h3><h3 class ="region" ><a href="/advisory/cooke-city" class="advisory-region" style="color: #fafafa;">Cooke City</a></h3></div><p><a>Today, there isn’t much new to report. Without a recent loading event, our generally stable snowpack remains in good shape. Yesterday, Alex ventured into Beehive Basin near Big Sky and found stable snow in his snowpits (</a><a href="https://www.youtube.com/watch?v=Yyk_tDXoH0w"><strong>video</strong></a>). He did observe a few wet loose slides on south facing slopes, but these were small and posed little threat. This is consistent with observations from Hyalite and the Cooke City area (<a href="https://www.mtavalanche.com/images/17/small-wet-loose-slides-beehive"><strong>photo</strong></a>, <a href="https://www.mtavalanche.com/images/17/wet-loose-cooke-city"><strong>photo</strong></a>, <a href="https://www.youtube.com/watch?v=RqIx4CG5zrM"><strong>video</strong></a>).</p> <p>Aside from small wet loose slides and isolated wind slabs, there isn’t much in the way of avalanche hazard. Although conditions are generally stable, now is no time to become complacent. It’s important to remember that avalanches can still happen and even small slides can have severe consequences.</p> <p>Today, a stable snowpack combined with stable weather will create generally safe avalanche conditions. For this reason the avalanche danger is rated <strong><a href = "/images/DangerScale-small.jpg" class ="colorbox "><span style = "background-color: #4db748; font-weight: bolder;"><span class = "avyhzrd-low">LOW</span></span></a></strong>.</p> <p>If you get out and have any avalanche or snowpack observations to share, drop a line via our <a href="https://www.mtavalanche.com/node/add/snow_observation">website</a>, email (<a href="mailto:mtavalanche@gmail.com">mtavalanche@gmail.com</a>), phone (406-587-6984), or Instagram (#gnfacobs).</p><div><ul class="button-list"><li><a href="/node/add/snow_observation">Submit Snow Observations</a></li></ul></div></div> <div class="clearfix text-formatted field field--name-body field--type-text-with-summary field--label-hidden field__item"><h3>Upcoming Avalanche Education and Events</h3> <p><a href="http://www.mtavalanche.com/workshops/calendar"><strong>Events and Education Calendar</strong></a></p> <p><u>BOZEMAN</u></p> <p>Dec. 13, <strong>Avalanche Awareness</strong>, 6:30-8 p.m. at Gallatin Valley Snowmobile Association, 4-Corners</p> <p>Jan. 12 and 13, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24616"><strong>Info and Register</strong></a></p> <p>Jan. 17, 18 and 20 or 21,<strong> Introduction to Avalanches w/ Field Day</strong>, <a href="https://events.ticketprinting.com/event/24614"><strong>Info and Register Here</strong></a></p> <p>Jan. 24, 25 and 27, <strong>Advanced Avalanche Workshop w. Field Day</strong>, <a href="https://events.ticketprinting.com/event/24615"><strong>Info and Register Here</strong></a></p> <p>Feb. 9 and 10, <strong>Companion Rescue Clinic</strong>, <a href="https://events.ticketprinting.com/event/24617"><strong>Info and Register</strong></a></p> <p><u>WEST YELLOWSTONE</u></p> <p>Dec. 14 and 15, <strong>Snowmobiler Introduction to Avalanches with Field Course</strong>, <a href="https://events.ticketprinting.com/event/25138"><strong>Info and Register Here</strong></a></p> <p><u>COOKE CITY</u></p> <p>8 and 9 December, <strong>Current Conditions and Avalanche Rescue</strong>, 6:30-7:30 p.m. Friday @ the Super 8, and anytime between 10-2 on Saturday @ Lulu Pass road.</p></div> <div class="clearfix text-formatted field field--name-field-forecasters-choice-text field--type-text-long field--label-above"> <div class="field__label">The Last Word</div> <div class="field__item"><p>The Last Word:</p> <p>Check out this 2-minute <a href="https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2FSINTRLLC%2Fvideos%2F838442133011897%2F&amp;show_text=0&amp;width=560">video</a> on the snowpack. Great graphics illustrate the process of sintering and faceting. Thanks to SINTR Visual Communications!</p> </div> </div> </div> </div> Sat, 09 Dec 2017 13:48:12 +0000 Eric Knoff 17966 at https://www.mtavalanche.com