Regional Conditions for Northern Gallatin

as of 5:00 am
Today0″ | N/A
Apr 22 3″ | N/A
Apr 21 4″ | N/A
9980′     04/01 at 03:00
61.5℉
NE - 0mph
Gusts 2mph
8100′   04/23 at 12:00
55℉
72″ Depth
Bottom Line: This week expect classic spring snowpack conditions, with great variability throughout the day and between aspect and elevation. Ideally the snowpack will be mostly frozen and stable in the morning, and then it will inevitably soften and lose strength through the day. Be diligent with route finding and snowpack assessment, anticipate changing conditions, pay attention to unexpected findings, and have a safe route to bail at any time. Consider terrain you will have to travel across or underneath later in the day when natural wet slides may occur or be easier to trigger. See our forecast page for general spring snowpack and travel advice.

Past 5 Days

Wed Apr 10

None
Fri Apr 12

None
Mon Apr 15

None
Fri Apr 19

None
Mon Apr 22

None

Avalanche Activity- Northern Gallatin

Bridger Range
Bridger Bowl
Widespread large natural wet loose in Bridgers
Incident details include images
Bridger Bowl
WL-N-R2-D1.5-S
Elevation: 8,000
Coordinates: 45.9072, -110.9750
Caught: 0 ; Buried: 0

Today (4/19/19) there were more and larger wet slides in addition to those that slid yesterday. Activity started before noon and slides were D1.5-D2 wet loose. One wet slab released north of Bridger Peak around 1400, probably from a cornice fall. There was widespread activity in addition to yesterday's slides on all slopes from Bridger Peak through Frazier Basin.


More Avalanche Details
Northern Madison
Fan Mountain
D3s on Fan and Cedar Mtn., Cornice/slab and wet loose at Big Sky
Fan Mountain
WL-N-R2-D3-O
Elevation: 10,500
Aspect: E
Coordinates: 45.2957, -111.5130
Caught: 0 ; Buried: 0

From BSSP: "There was considerable cornice growth... in most cases, natural failure sometime early morning, triggering recent wind slabs. Shots were producing very local results, with the exception of orbit in the gum wall, failing size 2 on storm/old snow interface. Also, low on the west wall, an east aspect, we had a 2’ crown triggered by cornice failure. This failed on a maybe week-old interface and partly filled the terrain trap. Similar stubborn results were observed on route, but once warmed up, these slabs became active in lenin, dirtbag wall, and hanging valley triggered on skis this afternoon. The upper a-z’s, pinnacles, and dirt bag wall were problematic with natural wet loose failure in most areas by late afternoon, running on previous melt/freeze crust. 

In the backcountry, fan mtn and cedar mtn failed well into older layers on east aspects from cornice failure, up to size 3-sizeable avalanches."


More Avalanche Details
Bridger Range
BRIDGER RANGE
Natural wet loose slides Bridgers
Incident details include images
BRIDGER RANGE
WL-N-R2-D1.5-S
Elevation: 8,000
Coordinates: 45.8068, -110.9230
Caught: 0 ; Buried: 0

Observed widespread natural wet loose slides, D1-D2, from Bridger Peak to north of Frazier Basin. Biggest on E-SE aspects in large terrain in northern Bridgers. Wet snow on NE up to 8,000 feet. Saw one maybe recent (poor viz) D2 slab in bowl south of Naya Nuki and some fresh small cornice fall/slabs at ridgeline. Widespread, but nothing major destructive.


More Avalanche Details

Photos- Northern Gallatin

Displaying 1 - 40 of 4.6116860184274E+18
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    Link to donate to the Friends of GNFAC: https://www.givebiggv.org/organizations/friends-of-the-gallatin-national-forest-avalanche-center

  • This slide occurred around 1400hrs on 4/19/19 with sunshine and temps above 50 F. Photo: GNFAC

  • Activity from 4/19/19. Photo: GNFAC

  • Activity from 4/19/19. Photo: GNFAC

  • Skiers saw this crown on Saturday (4/13) in the N. Bridgers. Photo: M. Gaffney

  • Recent spring snow has created instabilities that are confined to within the new snow. Areas such as ridgelines where fresh drifts form should be approached with caution. Cornices and fresh wind slabs should be avoided after fresh snow and/or strong wind. Photo. M. Gaffney

  • Photo: GNFAC

  • From e-mail on 4/11/19: "We found reactive storm slabs and touchy windslabs near ridgelines. We kicked off a small windslab in 4th of July from the top of the couloir. Attached is a photo of the crown to give you a depth perspective. It was about 6 feet across and 3-4 inches deep."

  • Snowpit dug at Bridger Bowl on Monday (4/8). Heavy snow and rain are creating dangerous avalanche conditions. Photo: BBSP

  • 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

  • Dry loose, wet loose, and dry slab avalanches on the east face of Mt. Blackmore. Photo: N. Salsburg

  • A skier in Hyalite found small but easy to trigger wind slabs at upper elevations near Mt. Bole in Hyalite. Photo: C. Kussmaul

  • A skier in Hyalite found small but easy to trigger wind slabs at upper elevations near Mt. Bole in Hyalite. Photo: C. Kussmaul

  • Photo: J. Dillon

  • Skiers in Hyalite saw a natural wet slab near Blackmore Lake. From the email: "The slide was located around 300 yards South of Blackmore Lake on a West facing slope at an elevation just above 7400 feet.  It broke below a cliff band about 3' deep (to the ground) and ran a few hundred feet (almost to the skin track)." Photo: JR Mooney

  • Skiers triggered this wet slab avalanche on Saturday afternoon (3/23). Warm sunny days have weakened the snowpack and made wet avalanches possible. Photo: G. Egnew

  • Skiers triggered this wet slab avalanche on Saturday afternoon (3/23). Warm sunny days have weakened the snowpack and made wet avalanches possible. Photo: G. Egnew

  • This wet slab was observed on Friday (3/22) across the Sourdough canyon trail, about 1.4 miles up. It put 4-6 feet of debris lower down in the creek. Although small, a heavy wet slide like this can be powerful and very dangerous. Current warm temperatures are a shock to the snowpack, and steep slopes should be avoided if the snow is wet. Photo: P. Brown

  • This wet slab was observed on Friday (3/22) across the Sourdough canyon trail, about 1.4 miles up. It put 4-6 feet of debris lower down in the creek. Although small, a heavy wet slide like this can be powerful and very dangerous. Current warm temperatures are a shock to the snowpack, and steep slopes should be avoided if the snow is wet. Photo: S. Gill

  • This wet slab was observed on Friday (3/22) across the Sourdough canyon trail, about 1.4 miles up. It put 4-6 feet of debris lower down in the creek. Although small, a heavy wet slide like this can be powerful and very dangerous. Current warm temperatures are a shock to the snowpack, and steep slopes should be avoided if the snow is wet. Photo: S. Gill

  • A skier sent in photos of multiple loose wet avalanches near Mt. Blackmore yesterday. Photo: G. Antonioli

  • Recent dry slab avalanche that was triggered by a falling cornice and failed at the ground. Photo: G. Antonioli

  • 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

  • On Friday (3/15) dry loose avalanches were easily triggered on steep terrain in Hyalite. Six inches of recent snow easily slid on crusts buried below it, and was drifted into small wind slabs near ridgelines. These types of small slides are typically not large enough to bury a person, but are dangerous if they catch and carry you over cliffs or into trees. Photo: GNFAC

  • This dry loose avalanche was intentionally triggered by a skier in Hyalite. Although generally small, dry loose avalanches can generate enough force to push skiers or riders into rocks or trees. Photo: C. Kussmaul 

  • A snowmobiler saw this recent activity on Saturday 3/9/19 on Cedar Mountain near Big Sky.

  • 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.

  • A natural avalanche that broke within the new snow on the east face of Mount Blackmore. Photo: G. Antonioli.

  • Small skier triggered slide in the new snow on Mount Blackmore. Photo: G. Antonioli

  • From e-mail: "Observed a small slide that appeared to be skier-triggered (tracks entering & exiting) on a wind-loaded, north-facing (21 degrees north) slope, slope angle of approximately 36 degrees." Photo: A. Yount

  • This crown was observed on 3/3 and likely slid a couple days earlier after steady snowfall and wind. This path had a large avalanche previously this winter in mid-January. Photo: G. Antonioli

  • This crown was observed on 3/3 and likely slid a couple days earlier after steady snowfall and wind. This is the second time this slopes slid this winter.It had a large avalanche in mid-January. Photo: G. Antonioli

  • Steady snowfall last week created soft slabs like this natural crown. Photo: G. Antonioli

  • Cornices are large, and intense spring sun will make them weak and easier to trigger or break naturally. Be cautious along ridgelines and on slopes below these monsters as temperatures warm. Photo: G. Antonioli

  • Loose snow slides are possible on sunny slopes during intense spring sunshine. Recent snow is unconsolidated and it may be easy to trigger loose slides on some steep slopes. Photo: G. Antonioli

Videos- Northern Gallatin

Weather Forecast Northern Gallatin

Extended Forecast for

14 Miles SE Gallatin Gateway MT

  • This
    Afternoon

    This Afternoon: A slight chance of rain before 3pm, then a slight chance of rain after 4pm.  Partly sunny, with a high near 50. West wind around 14 mph, with gusts as high as 23 mph.  Chance of precipitation is 20%.

    Slight Chance
    Rain

    High: 50 °F

  • Tonight

    Tonight: A 30 percent chance of rain, mainly before 9pm.  Mostly cloudy, with a low around 34. West wind 9 to 14 mph, with gusts as high as 20 mph.

    Chance Rain

    Low: 34 °F

  • Wednesday

    Wednesday: A chance of rain and snow before 10am, then a chance of rain. Some thunder is also possible.  Partly sunny, with a high near 45. Breezy, with a west southwest wind 8 to 13 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 30 mph.  Chance of precipitation is 40%. Little or no snow accumulation expected.

    Chance
    Rain/Snow
    then Chance
    Rain and
    Breezy

    High: 45 °F

  • Wednesday
    Night

    Wednesday Night: Mostly clear, with a low around 28. Northwest wind 10 to 18 mph, with gusts as high as 28 mph.

    Mostly Clear

    Low: 28 °F

  • Thursday

    Thursday: Partly sunny, with a high near 48. West wind 5 to 14 mph becoming east northeast in the morning.

    Partly Sunny

    High: 48 °F

  • Thursday
    Night

    Thursday Night: Mostly cloudy, with a low around 34.

    Mostly Cloudy

    Low: 34 °F

  • Friday

    Friday: A chance of rain and snow before 10am, then rain. Some thunder is also possible.  High near 46. Breezy.  Chance of precipitation is 80%. Little or no snow accumulation expected.

    Chance
    Rain/Snow
    then Rain and
    Breezy

    High: 46 °F

  • Friday
    Night

    Friday Night: Rain likely before 8pm, then rain and snow likely between 8pm and midnight, then a chance of snow after midnight. Some thunder is also possible.  Mostly cloudy, with a low around 31. Breezy.

    Rain/Snow
    Likely and
    Breezy then
    Chance Snow

    Low: 31 °F

  • Saturday

    Saturday: A chance of snow.  Mostly sunny, with a high near 41. Breezy.

    Chance Snow
    and Breezy

    High: 41 °F

The Last Word

For more spring travel advice see this article from our GNFAC forecaster blog.