Trip Planning for Island Park

as of 5:00 am
May 11″ | NA
Apr 30 1″ | NA
Apr 29 1″ | NA
9885′     04/23 at 10:00
32.2℉
S - 10mph
Gusts 44 mph
8750′     05/20 at 00:14
64.6″ Depth
0.5″New
7710′     05/19 at 23:00
33℉
23″ Depth
Bottom Line: Spring weather can be highly variable and create a mix of avalanche problems to watch out for. Snow conditions and snow stability can change drastically from day to day or hour to hour. Anticipate rapid change and plan accordingly. Plenty of snowfall over the winter with more spring snow to come makes avalanches possible into summer.

Past 5 Days

Fri Apr 19

None
Mon Apr 22

None
Fri Apr 26

None
Mon Apr 29

None
Thu May 2

None

Relevant Avalanche Activity

Cooke City
Republic Mountain
Skier triggered large Wet loose on the fin
Incident details include images
Republic Mountain
L-ASu-R2-D2-I
Elevation: 10,000
Aspect: E
Coordinates: 45.0003, -109.9540
Caught: 0 ; Buried: 0

From obs.: “Our party (3) triggered a significant wet loose slide on the fin today. I, the first skier dropped in next to existing tracks from earlier in the morning. I made a couple of small turns in unskied snow to test it and decided that not much was moving. As I continued down the wet surface snow started to slide and accumulate. My partner called me on the radio to tell me a lot of snow was moving behind me and I cut left. I traversed hard to lower angle terrain until I felt I could safely descend the rest of the slope.  My partners descended the bed surface until they could traverse out. 

We made several key mistakes today.  We knew it would be warm and that we should be up and down early.  We left later than planned, moved slower than expected and failed to adjust our plan.  We mistook lack of wet loose activity on similar aspects and elevations on features we could see as sign of stability.  We failed to make a plan B or establish a turnaround time.  We interpreted a party ahead of us that skied the slope as a go ahead.  Another party approaching behind us added pressure to go. They also skied the slope after us in similar style to my partners.

In our favor, we communicated well, radios were key, stayed calm and we managed ourselves through the situation. I feel humbled and lucky to have gotten away with a free lesson.  One that I didn't think I should have needed.”


More Avalanche Details

Relevant Photos

Displaying 1 - 40
  • On 5/4/24 Skiers triggered large wet loose slides on the Fin near Cooke City

  • From IG mesasge (4/6): "Some wet action at arange peak near Sawtell yesterday. From slope Dave and I did our first pit on Monday. Lots of release in that new old interface but didn’t see anything releasing down deeper." Photo: Z. Bailey

  • From email:" photo of mostly cloudy skies. 53 deg F while driving through IP at around 4pm" Photo: M. Staples

  • We saw a small natural avalanche below Reas Peak on a northerly aspect. Photo: GNFAC

  • We saw two avalanches below Reas Peak on North aspects that were likely triggered by snowmobilers. Photo: GNFAC

  • We saw two recent natural avalanches that broke below the wind-drifted snow in Jefferson Bowl. Photo: GNFAC

  • We saw two recent natural avalanches that broke below the wind-drifted snow in Jefferson Bowl. Photo: GNFAC

  • We saw a natural avalanche that broke near Yale Creek on a southern aspect that broke below the recent snow. Photo: GNFAC

  • 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

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

  • Overnight

    Overnight: A 30 percent chance of snow, mainly after 5am.  Mostly cloudy, with a low around 27. North northeast wind around 10 mph.  Total nighttime snow accumulation of less than a half inch possible.

    Low: 27 °F

    Chance Snow

  • Monday

    Monday: A chance of snow before noon, then snow showers, mainly after noon. Some thunder is also possible.  High near 41. North northeast wind 9 to 11 mph, with gusts as high as 21 mph.  Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Chance Snow
    then Snow
    Showers

  • Monday Night

    Monday Night: Snow showers likely before 9pm, then snow likely, mainly between 9pm and midnight. Some thunder is also possible.  Mostly cloudy, with a low around 28. North wind 11 to 14 mph, with gusts as high as 23 mph.  Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 28 °F

    Snow Showers
    Likely

  • Tuesday

    Tuesday: A chance of snow before noon, then snow showers likely after noon. Some thunder is also possible.  Mostly cloudy, with a high near 45. North wind 10 to 14 mph, with gusts as high as 23 mph.  Chance of precipitation is 70%. Little or no snow accumulation expected.

    High: 45 °F

    Snow Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of rain and snow showers before midnight. Some thunder is also possible.  Partly cloudy, with a low around 30. West northwest wind 7 to 10 mph becoming southeast after midnight. Winds could gust as high as 18 mph.  Chance of precipitation is 30%. Little or no snow accumulation expected.

    Low: 30 °F

    Chance
    Rain/Snow
    then Partly
    Cloudy

  • Wednesday

    Wednesday: A chance of snow before noon, then rain and snow showers between noon and 3pm, then rain showers after 3pm. Some thunder is also possible.  High near 42. South southwest wind 8 to 18 mph, with gusts as high as 30 mph.  Chance of precipitation is 80%. New snow accumulation of around an inch possible.

    High: 42 °F

    Chance Snow
    then
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain showers before 9pm, then rain and snow showers between 9pm and 3am, then snow after 3am. Some thunder is also possible.  Low around 29. South wind 10 to 15 mph, with gusts as high as 28 mph.  Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 29 °F

    Rain/Snow

  • Thursday

    Thursday: Snow before noon, then snow showers after noon. Some thunder is also possible.  Cloudy, with a high near 38. South wind 13 to 15 mph, with gusts as high as 25 mph.

    High: 38 °F

    Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before midnight.  Mostly cloudy, with a low around 26.

    Low: 26 °F

    Snow Likely

The Last Word

We began daily forecasts on December 7. 130 daily forecasts and 464 reported avalanches later, we wrapped up our daily forecasting season on April 14th. Read our SEASON SUMMARY to look back at the 2023-24 avalanche forecasting season.

Thank you to everyone that sent in observations, read the advisories, took an avalanche class, or donated money, time or gear. Our success is directly related to support from the community and the Forest Service. Have a safe spring and summer!

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