Bulletin d’avalanche

Logan

Utah Avalanche Center
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Danger d’avalanche

  • Alpin
  • Limite forestière
  • Sous la limite forestière
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Today, the warmest temperatures of the year will cause dangerous avalanche conditions and CONSIDERABLE danger at all elevations on backcountry slopes steeper than 30°. On slopes facing northwest through east in upper and mid elevation terrain, the danger could rise to HIGH due to midday heat. Large natural avalanches are probable, and people are likely to trigger dangerous wet slab avalanches, up to two feet deep and a couple hundred feet wide, failing on a buried persistent weak layer of faceted snow. Natural and human triggered loose wet avalanches are likely in steep terrain at all elevations.

  • Avoid being on or beneath backcountry slopes steeper than 30°, particularly during the heat of the day.
  • Stay out of avalanche paths and away from obvious and historic avalanche runouts.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    3

    On slopes facing the north half of the compass, natural avalanches are possible and it is likely people will trigger dangerous (wet) slab avalanches failing on a sugary, buried persistent weak layer. These days there are few telltale signs of instability or apparent red flags, like cracking or collapsing. Today's heat will cause increasing instability on slopes plagued by this buried persistent weak layer. The warming will continue to soften existing slabs and crust layers, and increase creep and glide rates, which will cause natural avalanches to become more possible and triggered avalanches more likely.

    • Avalanches failing on a buried persistent weak layer might be triggered remotely or from a distance.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    3

    Temperatures overnight did not drop below freezing in the mountains, but the mostly clear skies probably cooled and superficially hardened the snow surface. It will be way too hot, well above average again today, and you should change your plans if you had big mountain objectives in mind. When the snow surface becomes damp or unsupportable, it's time to head home. Watch for signs of heat-related instability like rollerballs, pinwheels, or sluffs of saturated surface snow. Just like a spilled 7/11 Slushy, wet or damp snow is generally unstable on steep slopes. The potential for dangerous wet slab activity will continue to increase today, and the danger could rise to HIGH on upper and mid elevation slopes facing northwest through east.

    This broad natural wet slab avalanche occurred sometime in the middle of the day yesterday in Shumway Canyon in the Wellsville Mountain Wilderness.

Special Announcement

Two generous UAC supporters are challenging the community to invest in the future of the UAC’s forecasting program during the 2022 Spring Campaign. They will match your donation, dollar for dollar, up to $10,000. Donate today to support avalanche forecasting!..... HERE

Recent Activity

A fresh natural slab avalanche in Bird Canyon was visible from across Cache Valley yesterday afternoon.

  • We observed a few sizable fresh natural avalanches, visible from across Cache Valley, yesterday afternoon in the Wellsville Mountain Wilderness.

  • A reported large avalanche occurred earlier in the week in Steam Mill Canyon on a steep northeast facing slope at 9600'. The trigger is unknown but the avalanche measured approximately 2' deep and 900' wide. It failed on the same widespread, buried persistent weak layer. Report is HERE.
  • Last weekend people triggered a handful of dangerous slab avalanches that failed on our widespread buried persistent weak layer consisting of loose, sugary faceted snow.

A rider was mostly buried and he and his bent and broken sled had to be excavated by companions in an avalanche accident Sunday in Crescent Lake Canyon, in the Franklin Basin area just south of the Idaho state line.

Check out all the recent backcountry observations and many recent avalanche reports from across Utah HERE.

Snow and Weather

Dangerous avalanche conditions exist at all elevations, and there are areas with unstable snow, especially on upper and mid-elevation slopes facing the north half of the compass. Weak sugary faceted snow still exists on northerly facing slopes creating poor snow structure, and people are likely to trigger dangerous avalanches if they venture into this terrain today. Today's even warmer temperatures will cause dangerous conditions for wet avalanches at all elevations. Natural wet loose and wet slab avalanches are likely, with wet slabs most likely in very steep terrain around or under cliff bands.

The 8400' Tony Grove Snotel reports 46°F, and there is 62 inches of total snow at the site, containing 76% of normal SWE for the date. South winds are blowing around 28 mph at the 9700' CSI Logan Peak weather station, where 43°F is the current and low temperature this morning.

  • Today expect mostly sunny and very warm conditions again, with high temperatures at 8500' around 58°F, and 15-20 mph south-southwest winds.
  • It will be partly cloudy tonight, with low temperatures near 33 F, and breezy 15 to 25 mph south-southwest winds.
  • Expect slightly cooler temperatures tomorrow, with increasing clouds and winds from the south-southwest. Snow showers are possible in the afternoon, but not much accumulation is expected. High temperatures at 8500' are expected to top out around 51°F, with 18 to 26 mph south-southwest winds and gusts around 40 mph.
  • Temperatures will gradually cool down as we head into next week, and we'll see a bit of a break from the high angled sun. Unsettled, more seasonal weather, with some snow and rain showers and breezy conditions is expected.

Additional Info

  • Now is a great time to practice your avalanche rescue skills. Thanks to the generous support of Northstar, the Franklin Basin Beacon Training Park is up and running. The park is located directly west of the parking lot and is open for anyone to use. All you need is your beacon and probe. Please do not dig up the transmitters.
  • Always follow safe backcountry travel protocols. Go one person at a time in avalanche terrain, while the rest of your party watches from a safe area. (practice anytime while traveling on or under backcountry slopes steeper than 30°)
  • Check your avalanche rescue equipment, change your batteries, and practice often with your backcountry partners. Check slope angles, and to avoid avalanche terrain stay off of and out from under slopes steeper than 30° and adjacent slopes. Video Here

General Announcements

Special thank you to Polaris and Northstar...Video Here

Who's up for some free avalanche training? Get a refresher, become better prepared for an upcoming avalanche class, or just boost your skills. Go to https://learn.kbyg.org/ and scroll down to Step 2 for a series of interactive online avalanche courses produced by the UAC.

  • Please submit your observations from the backcountry HERE.

This information does not apply to developed ski areas or highways where avalanche control is normally done. This forecast is from the U.S.D.A. Forest Service, which is solely responsible for its content. This forecast describes general avalanche conditions and local variations always occur.

Régions couvertes