Bollettino valanghe

Snake River Range

Bridger-Teton Avalanche Center
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Pericolo valanghe

Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 9 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Human triggered avalanches remain likely today. Recent snowfall above 8,500’, strong winds and rain up to 8,700’ continue to stress weak layers in the snowpack. Evaluate the snow and weather carefully today if you venture out as abnormally warm and wet weather continues to impact the snowpack. A shallow snowpack at lower elevations continues to present obstacles to access and potential hazards just under the surface.

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    Observers in the Tetons and Togwotee yesterday found conditions that were not as unstable as expected given the forecasted winter storm. They did however find that the snowpack structure remains a real concern despite the underwhelming amount of new snowfall. The primary layer of concern in the upper snowpack continues to show signs of potential triggering. Slab thickness could be two or even three feet thick in high, windloaded aspects. Observations are sparse in the Snake River, Salt and Wyoming Ranges due to limited access but a recent observation from Prater Canyon confirmed that weak layers near the surface are unstable. Dig frequently to identify layers of concern if you venture out.

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    You’ll find slab depths in wind loaded terrain of one to two feet with the greatest depths at higher elevations in exposed, rocky locations. Stubborn but thicker wind slabs that developed days ago may be up to two feet thick in high northerly locations. The warming conditions are likely to make these wind slabs easier to trigger. 

    Temperatures will continue to warm today so be aware of the potential for wet loose avalanches below 9,000’ or so. These could entrain new snow and push you where you don’t want to go.

Avalanche Discussion

Peak instability from this winter storm is likely to have passed already. Forecasted snowfall did not pan out but the warming trend and continued snowfall and wind remains a concern. This warmth will ultimately help stabilize our early season weak layers but the heat will increase instability for today. We’ll have to wait and see how today’s weather contributes to new snow avalanche problems. Weather forecast uncertainty contributes heavily to avalanche forecast uncertainty so evaluation is the name of the game today.

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