Trip Planning for Island Park

as of 5:00 am
Feb 240″ | 20-72 W
Feb 23 0″ | 10-50 NW
Feb 22 0″ | 5-20 NW
9885′     02/25 at 01:00
17.8℉
W - 34mph
Gusts 45 mph
8750′     02/25 at 02:04
66.8″ Depth
0.6″New
7710′     02/25 at 01:00
28℉
59″ Depth
Primary Problem: Persistent Weak Layer
Bottom Line: Today people can easily trigger large avalanches, potentially from flatter terrain below steep slopes. Moderate to strong wind yesterday and today drifted snow into thicker slabs, keeping the snowpack especially unstable on wind-loaded slopes. Weak layers of facets and surface hoar buried 2-4 feet deep make up the foundation of the snowpack, and are as weak as we’ve seen. The best plan is to avoid riding on or beneath slopes steeper than 30 degrees.

Past 5 Days

Tue Feb 20

Considerable
Wed Feb 21

Considerable
Thu Feb 22

Considerable
Fri Feb 23

Considerable
Sat Feb 24

Considerable

Relevant Avalanche Activity

Lionhead Range
Hebgen Lake
Large whumps, Hebgen Lake
Incident details include images
Incident details contain video
Hebgen Lake
Elevation: 8,200
Aspect: NE
Coordinates: 44.8381, -111.3430
Caught: 0 ; Buried: 0

 A small whumpf in the skin track was followed by a massive one a few minutes later. I can count on one hand the number of times I got whumpfs in a skin track...rare indeed. The second one was so big it had us both deeply concerned. We peeled off the skin track after deciding to not cross a gully and soon found debris from a sizeable avalanche that released a couple days ago about 500' above us. We dug in the flank and had 100cm of snow, 60 cm new from last week. The snowfall during the Avalanche Warning, doubled the depth and more than doubled the snow water equivalent of the snowpack. It was a large load and avalanches are breaking underneath the new snow.

Karl was using his 100 cm long Norwegian Battle Saw (pic)...a bit overkill.


More Avalanche Details
Island Park
Centennials - Idaho
Multiple recent avalanche Centennials
Incident details include images
Centennials - Idaho
SS-N-R2-D2-O
Aspect: N
Coordinates: 44.5424, -111.7520
Caught: 0 ; Buried: 0

From obs. 2/11: "No details, came upon them while riding and making observations of the terrain. One was North-Northeast, the other was North-Northwest facing. Across the drainage from each other. Also, notice three other small avalanches on a west facing slope, about two miles east of the first two. All five were on slopes well over 30. In the centennial mountains, close to the continental on the Idaho/Montana border."


More Avalanche Details
Island Park
CENTENNIAL RANGE
Recent Naturals in Island Park
Incident details include images
CENTENNIAL RANGE
N-R2-D2
Aspect: E
Coordinates: 44.5278, -111.5680
Caught: 0 ; Buried: 0

From IG 2/10/24: “East aspect, southwest of island park from the blue creek trailhead.”


More Avalanche Details

Relevant Photos

Displaying 1 - 38
  • From obs: "No details, came upon them while riding and making observations of the terrain. One was North-Northeast, the other was North-Northwest facing. Across the drainage from each other. Also, notice three other small avalanches on a west facing slope, about two miles east of the first two. All five were on slopes well over 30. In the centennial mountains, close to the continental on the Idaho/Montana border."

  • From obs: "No details, came upon them while riding and making observations of the terrain. One was North-Northeast, the other was North-Northwest facing. Across the drainage from each other. Also, notice three other small avalanches on a west facing slope, about two miles east of the first two. All five were on slopes well over 30. In the centennial mountains, close to the continental on the Idaho/Montana border."

  • Riders snapped a photo of natural avalanche activity above Blue Creek in the Centennial Mountains. Photo: P Rockwell

  • A small avalanche that was triggered by riders on 02/08/2024. Photo: GNFAC

  • This avalanche was triggered by riders a few days ago. This was a small slope and broke 100' wide and 2-3' deep. Photo: GNFAC 

  • Snowmobilers in Hell Roaring Creek saw a few natural avalanches that happened in the last week. The exact date is unknown.  Photo: B. Schleicher

  • Snowmobilers in Hell Roaring Creek saw a few natural avalanches that happened in the last week. The exact date is unknown.  Photo: B. Schleicher

  • Snowmobilers in Hell Roaring Creek saw a few natural avalanches that happened in the last week. The exact date is unknown.  Photo: B. Schleicher

  • This on one of over 15 avalanches snowmobilers saw today, 01/30/2024. These avalanches likely happened on 01/29 or the morning of 01/30. Photo. N.

  • This on one of over 15 avalanches snowmobilers saw today, 01/30/2024. These avalanches likely happened on 01/29 or the morning of 01/30. Photo. N.

     

  • Do you like to hike? Do you like to ski? Then the King & Queen of the Ridge is for you. Hike, ski and raise money for the Friends of the Avalanche Center in their 2nd biggest fundraiser of the year. Join the effort to promote and support avalanche safety and awareness! Fundraising prizes for top 5 individuals who raise over $500. No racing is necessary to compete for the fundraising prizes. Info to fundraise is HERE or donate here. Race participants for the [insert dates] event must register separately with Bridger Bowl here.

  • A rider triggered this avalanche while side-hilling across the bottom of the slope. The rider was able to quickly turn downhill and avoid the slide. No one was caught. Photo: Anonymous

  • A rider triggered this avalanche while side-hilling across the bottom of the slope. The rider was able to quickly turn downhill and avoid the slide. No one was caught. Photo: Anonymous

  • On Sawtelle Peak, Island Park, when the clouds lifted we could see a crown of a snowmobiler triggered slide that occurred yesterday. It broke on the buried surface hoar and facets about 1.5 feet under the surface. Recent snow and wind-loading has created dangerous avalanche conditions. Photo: GNFAC

  • On Sawtelle Peak, Island Park, when the clouds lifted we could see a crown of a snowmobiler triggered slide that occurred yesterday. It broke on the buried surface hoar and facets about 1.5 feet under the surface. Recent snow and wind-loading has created dangerous avalanche conditions. Photo: GNFAC

  • On Sawtelle Peak, Island Park, when the clouds lifted we could see a crown of a snowmobiler triggered slide that occurred yesterday. It broke on the buried surface hoar and facets about 1.5 feet under the surface. Recent snow and wind-loading has created dangerous avalanche conditions. Photo: GNFAC

  • Snowpit at the Head of Hellroaring Creek on 1/7/24. Note the two stripes of surface hoar in the pit wall.

  • We measured 16" of low-density snow equaling 0.7" of snow water equivalent at higher elevations in the Centennial Mountains of Island Park, ID. The new snow is sitting on a couple of layers of feathery surface hoar and a weak snowpack. It will not take much wind, settlement, or new snow to push the snowpack to the breaking point. Photo: GNFAC

  • New snow in Island Park made for beautiful views and heightened avalanche danger as the new snow fell on a snowpack riddled with weak layers. Photo: GNFAC

  • Doug Chabot walking off Lionhead Ridge to a snowpit site.

  • We snowmobiled up to 9,000' on Sawtelle peak, then skied to dig a couple pits. Our first pit was on an East aspect on a heavily wind loaded slope. The HS was 130cm (or 4.2 feet). There was 8" of new snow equal to 0.85" SWE, sitting over old consolidated snow that made up a slab over soft, weak facets about 50cm off the ground. We had ECTP24 x2 break on the old weak snow.... Photo: GNFAC

  • We snowmobiled up to 9,000' on Sawtelle peak on 12/23/23. The snow depth at 8,800' was 3-4 feet. Photo: GNFAC

  • Riders saw large surface hoar crystals while riding outside of Island Park. Photo. B.Schleicher

     

  • From IG on 12/10: "2 slides we triggered remotely in tepee yesterday"

  • From facebook message: "North facing slope 15 miles south of west Yellowstone probably 30ish degree slope. Probably 16-18 inch slab". Photo: T. Taubman

  • We met up with the Fugawee Snowmobile Club, Idaho Parks and Recreation, and Klim to install new beacon checkers at the trailhead in Island Park. Great work to the team! Photos: GNFAC

  • We met up with the Fugawee Snowmobile Club, Idaho Parks and Recreation, and Klim to install new beacon checkers at the trailhead in Island Park. Great work to the team! Photos: GNFAC

  • We met up with the Fugawee Snowmobile Club, Idaho Parks and Recreation, and Klim to install new beacon checkers at the trailhead in Island Park. Great work to the team! Photos: GNFAC

  • We met up with the Fugawee Snowmobile Club, Idaho Parks and Recreation, and Klim to install new beacon checkers at the trailhead in Island Park. Great work to the team! Photos: GNFAC

  • We met up with the Fugawee Snowmobile Club, Idaho Parks and Recreation, and Klim to install new beacon checkers at the trailhead in Island Park. Great work to the team! Photos: GNFAC

  • Fugawee Snowmobile Club Assembling New Beacon Checkers. Photo: Kent

  • Went to do maintenance on the Sawtelle Snowfall weather station at 8800 ft just off the Sawtelle Mountain Road. Continuous snowcover starts around 8000 ft. At 8800 ft there is ~20" of snow with a mix of hard crusts and weak facets. These weak layers near the ground will be something to watch once snows again. Photo: GNFAC

  • Went to do maintenance on the Sawtelle Snowfall weather station at 8800 ft just off the Sawtelle Mountain Road. Continuous snowcover starts around 8000 ft. At 8800 ft there is ~20" of snow with a mix of hard crusts and weak facets. These weak layers near the ground will be something to watch once snows again. Photo: GNFAC

  • Went to do maintenance on the Sawtelle Snowfall weather station at 8800 ft just off the Sawtelle Mountain Road. Continuous snowcover starts around 8000 ft. At 8800 ft there is ~20" of snow with a mix of hard crusts and weak facets. These weak layers near the ground will be something to watch once snows again. Photo: GNFAC

  • From IG: “Pine creek today, some small wind slabs and a full depth wet slide off black mountain”

  • From IG: “Pine creek today (10/21), some small wind slabs and a full depth wet slide off black mountain”

  • From obs. "Was out alpine climbing today and observed the north face of Blackmore had slid already."

  • Get your tickets and online bid for items HERE!

Videos- Island Park

Snowpit Profiles- Island Park

 

Select a snowpit on the map to view the profile image

Weather Forecast Island Park

Extended Forecast for

10 Miles ESE Lakeview MT

High Wind Warning February 25, 12:00pm until February 26, 05:00pmWinter Storm Warning February 25, 11:00pm until February 26, 11:00pmClick here for hazard details and duration High Wind Warning Winter Storm Warning
  • Overnight

    Overnight: A 20 percent chance of snow.  Mostly cloudy, with a low around 18. South southwest wind around 11 mph, with gusts as high as 18 mph.

    Slight Chance
    Snow

    Low: 18 °F

  • Sunday

    Sunday: A 40 percent chance of snow, mainly after noon.  Patchy blowing snow after 11am. Cloudy, with a high near 30. Breezy, with a south wind 11 to 16 mph increasing to 24 to 29 mph in the afternoon. Winds could gust as high as 41 mph.  New snow accumulation of less than one inch possible.

    Chance Snow
    and Patchy
    Blowing Snow

    High: 30 °F

  • Sunday
    Night

    Sunday Night: Snow, mainly after 4am.  Widespread blowing snow, mainly after 11pm. Low around 27. Windy, with a south southwest wind 28 to 33 mph, with gusts as high as 48 mph.  Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Chance Snow
    and Blowing
    Snow then
    Snow and
    Blowing Snow

    Low: 27 °F

  • Monday

    Monday: Snow. The snow could be heavy at times.  Widespread blowing snow. High near 27. Windy, with a south southwest wind 33 to 37 mph, with gusts as high as 55 mph.  Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.

    Heavy Snow
    and Blowing
    Snow

    High: 27 °F

  • Monday
    Night

    Monday Night: Snow. The snow could be heavy at times.  Widespread blowing snow, mainly before 8pm. Low around 7. Windy, with a southwest wind 28 to 33 mph becoming north northwest 16 to 21 mph in the evening. Winds could gust as high as 48 mph.  Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Heavy Snow
    and Blowing
    Snow

    Low: 7 °F

  • Tuesday

    Tuesday: Snow likely.  Mostly cloudy, with a high near 14. West northwest wind 14 to 18 mph, with gusts as high as 29 mph.  Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Snow Likely

    High: 14 °F

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of snow.  Partly cloudy, with a low around 1. West wind 10 to 17 mph becoming south southwest after midnight. Winds could gust as high as 25 mph.

    Slight Chance
    Snow

    Low: 1 °F

  • Wednesday

    Wednesday: A chance of snow.  Mostly cloudy, with a high near 18. South southwest wind 11 to 17 mph, with gusts as high as 26 mph.

    Chance Snow

    High: 18 °F

  • Wednesday
    Night

    Wednesday Night: A chance of snow.  Mostly cloudy, with a low around 15.

    Chance Snow

    Low: 15 °F

The Last Word

On Thursday Ian rode in the Independence Mine area (up the Main Boulder, outside our advisory area) to check out the snowpack conditions before the Sweet Grass County Recreation Association Poker Ride tomorrow. Watch our video for a snowpack update. Avoiding riding on and staying out from under slopes steeper than 30 degrees would be a wise choice if you’re headed up to join in the fun this weekend.

02 / 23 / 24  <<  
 
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