Regional Conditions for Lionhead Range

as of 5:00 am
Apr 305″ | N/A
Apr 29 0″ | N/A
Apr 28 0″ | N/A
8775′     /00 at :
- mph
Gusts mph
7750′   05/20 at 17:00
36℉
46″ Depth
Bottom Line: Avalanches will be mostly confined to new snow that falls. Shallow wet slides are possible if rain or warm temperatures melt the snow surface. Anticipate new snow stability to decrease with wind, sun or above freezing temperatures. Be aware of deeper wet slides if the snowpack doesn’t freeze overnight, or if there is heavy rain. Now is just as important as ever to be diligent with snowpack assessment and choose terrain carefully. See our forecast page for general spring snowpack and travel advice.

Past 5 Days

Fri Apr 19

None
Mon Apr 22

None
Fri Apr 26

None
Mon Apr 29

None
Thu May 2

None

Avalanche Activity- Lionhead Range

Northern Madison
Fan Mountain
Natural wet slabs on Fan Mtn.
Incident details include images
Fan Mountain
WS-N-R3-D3-O
Elevation: 10,000
Coordinates: 45.2991, -111.5220
Caught: 0 ; Buried: 0

Natural wet slabs were widespread on Fan Mtn. near Big Sky during the week of 5/13-5/16.


More Avalanche Details
Northern Madison
Beehive Basin
Natural Wet Slab in Beehive
Incident details include images
Beehive Basin
WS-N-R4-D2.5-O
Elevation: 9,600
Aspect: S
Coordinates: 45.3508, -111.4040
Caught: 0 ; Buried: 0

Skiers saw a large wet slab that released naturally sometime before 0745 on Tuesday (5/14). 


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Bridger Range
Saddle Peak
Natural wet slab on Saddle Peak
Incident details include images
Saddle Peak
WS-NC-R2-D2.5-O
Elevation: 9,000
Aspect: E
Coordinates: 45.7952, -110.9350
Caught: 0 ; Buried: 0

Wet slab released naturally Tuesday (5/14/19) evening on Saddle Peak. "South side of 1/4 Saddle slid sometime last night. Looks like cornice drop then step down to near ground. Hi yesterday at Alpine was 62." -R. Elliott/BBSP


More Avalanche Details

Photos- Lionhead Range

Displaying 1 - 40 of 4.6116860184274E+18
  • Natural wet slabs were widespread on Fan Mtn. near Big Sky during the week of 5/13-5/16. Photo: E. Mullen

  • Natural wet slabs were widespread on Fan Mtn. near Big Sky during the week of 5/13-5/16. Photo: E. Mullen

  • This natural wet slab slid early this week, Monday (5/13) or early Tuesday (5/14), near Beehive Peak. This photo was taken 0745 Tuesday morning. Photo: @cfirer

  • Debris from a wet slab that released naturally Tuesday evening on saddle Peak. Debris ran very far into the runout compared to similar sized dry slabs that often occur on this path. "South side of 1/4 Saddle slid sometime last night. Looks like cornice drop then step down to near ground. Hi yesterday at Alpine was 62." -R. Elliott/BBSP

  • This wet slab released naturally Tuesday evening on saddle Peak. "South side of 1/4 Saddle slid sometime last night. Looks like cornice drop then step down to near ground. Hi yesterday at Alpine was 62." -R. Elliott/BBSP

  • "South side of the Glide Plane released as a glide avalanche last evening (May 12th) sometime around 6 pm according to source. Bed surface was ground in starting zone of wet clay soil sparsely covered in long grass.  Debris chunks, some snowmobile sized, rode up on surface and slid approx. 200 vert.  Debris could have bumped a tower on the old Alpine lift if it still lived there. Last freeze was 6 am on the 10th of May.  The high temperature on the 12th was 59 degrees at 4 pm." Photo and observations: BBSP

  • "South side of the Glide Plane released as a glide avalanche last evening (May 12th) sometime around 6 pm according to source. Bed surface was ground in starting zone of wet clay soil sparsely covered in long grass.  Debris chunks, some snowmobile sized, rode up on surface and slid approx. 200 vert.  Debris could have bumped a tower on the old Alpine lift if it still lived there. Last freeze was 6 am on the 10th of May.  The high temperature on the 12th was 59 degrees at 4 pm." Photo and observartions: BBSP

  • Skiers found fresh wind slabs that were easily triggered on Saturday 4/27 near Beehive Basin in the northern Madison Range. Photo: E. Birkeland

  • Spring Sled Fest is May 18th! DJ, Free BBQ, Raffle. All proceeds go to the Friends of the Avalanche Center. More event details here: https://www.facebook.com/events/2290792671007553/ Thanks to Mark Christensen @markass406 and Nick Donovan @skidooin_it for organizing the event.

  • Skiers easily triggered loose snow avalanches of the 3-5” of new snow. This morning (4/27) on the Bridger Ridge. Photo: @smooneyski

  • Skiers easily triggered loose snow avalanches of the 3-5” of new snow. This morning (4/27) on the Bridger Ridge. Photo: @smooneyski

  • Observed 4/20/19. Crown estimated 3-5' deep. Above freezing temperatures, sunshine and rain created a wet and weak snowpack. Photo: G. Antonioli

  • Observed 4/20/19. Crown estimated 3-5' deep. Above freezing temperatures, sunshine and rain created a wet and weak snowpack. Photo: G. Antonioli

  • Below 3-5" of new snow there is a supportable frozen crust on top of a wet snowpack on most slopes. Avalanches are mostly confined to the new snow on top of this crust (wet loose, dry loose, wind slabs). However, where the snowpack did not freeze below the new snow, or when this crust melts, deeper wet slides are possible. Photo: GNFAC

  • Snowmobile-triggered slide near Fairy Lake on Saturday (3/30). New snow was drifted into small wind slabs that may remain reactive in isolated areas.  Photo: P. Cronin

  • Outside Cooke City up Zimmer Creek, a skier spotted this cornice fall which triggered a small pocket down low. Photo: F. Madsen

  • Many wet loose and wet slab avalanches were seen near Zimmer Creek (north of Cooke City) on south and east aspects. Temperatures were warm at 10,000 feet. Photo: F. Madsen

  • This photo near Lionhead, is indicative of the wet loose avalanches we are seeing on many low elevation, south facing slopes throughout our advisory area. Daytime temperatures near 50F will make avalanches like this more frequent and widespread in the coming days.

  • Low angle metal roofs have heavy, thick slabs of snow that built up during persistent cold temperatures. These slabs will slide during warm temperatures. Be on the lookout for overhead hazard and be cautious where you walk or park your car during warm sunny days. An additional urban hazard are large icicles are that will break during warm days. Photo: A. Schauer

  • This slide was triggered on a steep (40 deg) southeast facing slope at Round Lake outside Cooke City. It failed 8" deep on a layer of graupel and small facets. An adjacent hill slid at the same depth beforehand. This layer is not on most slopes, but as this slide shows it is on some. Doug was in the area and dug a pit in the crown soon after it was triggered. Photo: J. Fritz

  • This slide on the NE face of Blackmore was triggered by the second skier. It was 8-12" deep and 100' wide and likely failed on small faceted crystals underneath the new snow. No one was caught. Going one at a time was good travel behavior that can save our lives when things go wrong.

  • This picture of the large avalanche on Lionhead Ridge was taken from Two Top Mtn to the south. Photo: P. Smith

  • The crown on this slide ranges from 4-6' deep. It occurred on a heavily wind loaded slope and broke on facets near the ground. It's a clear reminder that large avalanches are possible in the mountains near West Yellowstone. 

  • This slide occurred in the Lionhead area near West Yellowstone. It broke 4-6' deep, failing on facets near the ground. It's unknown if it was triggered by a natural cornice failure or by a snowmobiler. Either way, it's a clear reminder that large avalanches are possible in the mountains near West Yellowstone. 

  • This snowmobile was fully buried, along with its rider on February 7th, 2019, in the Centennial Range.

  • Photo of the snowmobile triggered slide that fully buried a rider on February 7th, 2019.

  • A large snowmobile triggered avalanche in the Gravelly Range (Outside of advisory area) on February 10th, 2019.

    From email: "One rider was involved in the incident and was fortunate to be on the upper left side of the bowl when he saw the slide start. ... the crown was about 325 wide and varied in depth from 1 to 4 or 5 feet.  The ridge line was wind loaded and this was an issue we had discussed as a group and wanted to avoid.  We had read the reports for the day and knew that wind loading as well as a persistent week layer were both concerns. .... The rider involved entered the area from around where the road switchbacked and did not realize what was above him due to reduced visibility."

  • This avalanche broke on weak snow in the lower 1/3 of the snowpack after a storm dropped 2-3' of heavy snow between 2/3 and 2/5/19. Photo: GNFAC

  • Multiple large avalanches occurred in the Lionhead area near West Yellowstone after 2-3’ of heavy snow earlier this week. Photo: GNFAC

  • This avalanche was triggered by snowmobilers on 2/6. 2-3’ of heavy snow earlier this week fell on a weak snowpack making large avalanches possible. Photo: GNFAC

  • This avalanche was triggered by snowmobilers on 2/6. 2-3’ of heavy snow earlier this week fell on a weak snowpack making large avalanches possible. Photo: GNFAC

  • From an email, "Observed this large avalanche while driving north from Jackson Hole today.  (on the E, NE aspect of Sawtell Peak, in the Centennial Mountains)"

    Likely released in the last day or so with the Avalanche Warnings on Sun, Mon and Tuesday. Photo: B. Fredlund

  • Snowmobilers in the Lionhead area got unstable test results, easily propagating fractures in ECT tests on a weak layer buried about 50 cm deep. Photo: J. Norlander

  • This photo was taken by a FS snow ranger on Feb 1st. These avalanches likely occurred towards the end of a period of steady snowfall from Jan 16th to 28th. From e-mail: "The Reas Peak area had 7 slides that I could see from the bottom of the drainage, most of them looked to have occurred with the last storm and had a northerly influence to their aspect. The largest and most recent slide I included in the [above photo], Reas Peak is the highest peak on the left in the photo and the slide path is on a NE aspect. If you look close at the photo you can see a 2-3’ crown on the far left side of the frame on the north aspect of Reas from another slide." Photo: C. Hericks

  • This photo of an avalanche on the north side of Reas Peak was taken by a FS snow ranger on Friday, Feb 1. It likely occurred towards the end of a period of steady snowfall from January 16th to 28th. Photo: C. Hericks

Videos- Lionhead Range

Weather Forecast Lionhead Range

Extended Forecast for

10 Miles WNW West Yellowstone MT

  • Tonight

    Tonight: Snow likely, mainly before midnight.  Patchy fog after 10pm.  Otherwise, mostly cloudy, with a low around 28. Northeast wind 7 to 10 mph.  Chance of precipitation is 60%. Total nighttime snow accumulation of less than a half inch possible.

    Snow Likely
    and Patchy
    Fog

    Low: 28 °F

  • Tuesday

    Tuesday: A chance of snow before noon, then snow showers likely after noon. Some thunder is also possible.  Patchy fog before 9am.  Otherwise, cloudy, with a high near 36. Northeast wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 20 mph.  Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Chance Snow
    and Patchy
    Fog then Snow
    Showers
    Likely

    High: 36 °F

  • Tuesday
    Night

    Tuesday Night: Snow likely.  Cloudy, with a low around 28. Blustery, with a northeast wind 20 to 25 mph, with gusts as high as 28 mph.  Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Snow Likely
    and Blustery

    Low: 28 °F

  • Wednesday

    Wednesday: Snow likely, mainly before noon.  Cloudy, with a high near 32. Breezy, with a north northeast wind 24 to 28 mph.  Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Snow Likely
    and Breezy

    High: 32 °F

  • Wednesday
    Night

    Wednesday Night: A 20 percent chance of snow before midnight.  Mostly cloudy, with a low around 26. Blustery, with a northeast wind 18 to 24 mph, with gusts as high as 28 mph.

    Blustery.
    Slight Chance
    Snow then
    Mostly Cloudy

    Low: 26 °F

  • Thursday

    Thursday: A chance of snow before noon, then a chance of snow showers after noon. Some thunder is also possible.  Mostly cloudy, with a high near 34. Breezy.  Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Chance Snow
    and Breezy

    High: 34 °F

  • Thursday
    Night

    Thursday Night: A chance of snow showers before midnight, then a slight chance of snow after midnight. Some thunder is also possible.  Cloudy, with a low around 28. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

    Chance Snow
    Showers

    Low: 28 °F

  • Friday

    Friday: A chance of snow before noon, then snow showers likely after noon. Some thunder is also possible.  Mostly cloudy, with a high near 36.

    Snow Showers
    Likely

    High: 36 °F

  • Friday
    Night

    Friday Night: A chance of snow showers before midnight, then a chance of snow after midnight. Some thunder is also possible.  Mostly cloudy, with a low around 31.

    Chance Snow
    Showers

    Low: 31 °F

The Last Word

Have a safe and enjoyable spring and summer. See you when the flakes start to fly next Fall! -Doug, Eric, Alex and Ian