Bulletin d’avalanche

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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

The avalanche danger is rated at MODERATE today.

Human triggered avalanches are possible but not likely.

Upper elevation steep slopes that face north through southeast which have a recent deposit of wind drifted snow are the most likely place to trigger an avalanche.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2

    I am still keeping my eyes on the November Persistent Weak Layer (DETAILS HERE). Things are fairly quiet out there right now and chances for triggering an avalanche are not very likely. However, I've learned never to trust a buried Persistent Weak Layer of loose sugary faceted snow. There are most likely landmines scattered about where a person could trigger a slide today. The most likely spots are upper elevation north through southeast facing slopes where recent deposits of wind drifted snow are present.

    If the anticipated storms come through this week, we may see this buried weak layer become more active again. It will depend on how much snow we get and how fast it falls. I'm hopeful that after these series of storms we will have enough snow on top of the old weak layer to smash it into a stronger layer that will no longer fail and produce avalanches. Time will tell, stay tuned.

    For some insight on a Moderate avalanche danger rating with a Persistent Weak Layer, read THIS BLOG POST BY FORECASTER ERIC TRENBEATH.

Recent Activity

This is somewhat old news now but still relevant to our current snowpack structure. I found an avalanche that released naturally during the strong northwest wind event on Thursday. (Pleasant Creek, DETAILS HERE) The wind drifted snow until it overloaded the slope. What caught my attention is that the avalanche broke into the November weak layer of loose faceted snow.

Snow and Weather

Current Conditions: Warm weather has continued over the last 24 hours. Temperatures have been in the upper 20s to low 30s. Most stations are at about 30˚F this morning. This made the snow surface damp up to around 8200' on Sunday. Above that elevation the snow remains cold. The wind has been from the northwest in the light to moderate speed categories. Riding conditions are not great in many places right now due to recent wind forming drifts and various crusts all over the place in the higher terrain.

Mountain Weather: Today will be the warmest day with temperatures well into the mid 30s with mostly cloudy skies. The wind shifts direction and will be from the southwest with fairly light speeds this morning and gradually increasing through Tuesday. Temperatures on Tuesday remain pretty warm with moderate to strong wind from the southwest. A decent looking storm moves in Tuesday through Wednesday. My initial thoughts are we should see a foot of snow out of it by late Wednesday. Lingering periods of snow remain through the rest of the week and then another pretty decent looking storm moves in for the weekend.

Additional Info

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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.

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