Trip Planning for Island Park

as of 5:00 am
Today1″ | 38-55 W
Feb 27 6″ | 10-70 N
Feb 26 1″ | 45-70 W
9885′     02/28 at 17:00
10.5℉
W - 22mph
Gusts 36 mph
8750′     02/28 at 17:54
69.7″ Depth
0.6″New
7710′     02/28 at 17:00
20℉
60″ Depth
Primary Problem: Wind-Drifted Snow
Bottom Line: Dangerous avalanche conditions exist throughout our forecast area. New snow and wind creates thick drifts which can be easily triggered. Winds are blowing at all elevations, not just ridgelines. A weak and unstable snowpack is getting an additional load of windblown snow and triggering large avalanches 2-4 feet deep remains likely, wind-loaded or not. It may be difficult to assess exactly where the wind-loads are, so treat all slopes suspiciously. Staying out of avalanche terrain is a wise move.

Past 5 Days

Sat Feb 24

Considerable
Sun Feb 25

Considerable
Mon Feb 26

Considerable
Tue Feb 27

Considerable
Today

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.

     

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  • 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 29, 08:00am until March 1, 04:00amClick here for hazard details and duration High Wind Warning
  • Tonight

    Tonight: A 20 percent chance of snow before 7pm.  Mostly cloudy, with a low around 14. Wind chill values as low as zero. South wind 14 to 21 mph, with gusts as high as 30 mph.

    Slight Chance
    Snow then
    Partly Cloudy

    Low: 14 °F

  • Thursday

    Thursday: A 50 percent chance of snow, mainly after 9am. The snow could be heavy at times.  Mostly cloudy, with a high near 29. Wind chill values as low as zero. Windy, with a south wind 16 to 21 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 44 mph.  New snow accumulation of 3 to 5 inches possible.

    Heavy Snow
    and Windy

    High: 29 °F

  • Thursday
    Night

    Thursday Night: Snow. The snow could be heavy at times.  Low around 23. Windy, with a south wind 31 to 40 mph, with gusts as high as 60 mph.  Chance of precipitation is 90%. New snow accumulation of 3 to 7 inches possible.

    Heavy Snow
    and Windy

    Low: 23 °F

  • Friday

    Friday: Snow.  High near 25. Windy, with a south southwest wind 30 to 39 mph, with gusts as high as 60 mph.  Chance of precipitation is 90%. New snow accumulation of 2 to 4 inches possible.

    Snow and
    Windy

    High: 25 °F

  • Friday
    Night

    Friday Night: Snow. The snow could be heavy at times.  Low around 18. Breezy, with a south wind 21 to 26 mph decreasing to 14 to 19 mph in the evening. Winds could gust as high as 39 mph.  Chance of precipitation is 90%. New snow accumulation of 3 to 5 inches possible.

    Heavy Snow
    and Breezy

    Low: 18 °F

  • Saturday

    Saturday: Snow. The snow could be heavy at times.  High near 25. Breezy, with a south southwest wind 18 to 24 mph, with gusts as high as 37 mph.  Chance of precipitation is 100%. New snow accumulation of 4 to 8 inches possible.

    Heavy Snow
    and Breezy

    High: 25 °F

  • Saturday
    Night

    Saturday Night: Snow.  Low around 8. South southwest wind 16 to 21 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 31 mph.  Chance of precipitation is 80%. New snow accumulation of 1 to 3 inches possible.

    Snow

    Low: 8 °F

  • Sunday

    Sunday: Snow.  Mostly cloudy, with a high near 16. West wind 10 to 16 mph, with gusts as high as 24 mph.

    Snow

    High: 16 °F

  • Sunday
    Night

    Sunday Night: A chance of snow.  Mostly cloudy, with a low around 3.

    Chance Snow

    Low: 3 °F

The Last Word

Clear weather and temperature fluctuations can make a weak layer in the top few cm of the snowpack called near-surface faceting. There are 3 dominant types which are explained in Bruce Jamieson’s new video featuring Karl Birkeland, Doug Chabot, Ed Adams, Mike Cooperstein, Ethan Greene and Mark Staples.

02 / 27 / 24  <<  
 
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