Lawinenlagebericht

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Lawinengefahr

Sun
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Human triggered avalanches are likely today at the middle and upper elevations due to the combination of recent snowfall, wind, and buried weak layers. Weak layers of snow are now buried 2-4 feet below the snow surface on most aspects and elevations, but could be deeper in specific terrain. Avalanches may be triggered remotely—from gentler terrain above, below, and to the sides of steep slopes. Conservative decision making and cautious route finding are advised. 

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2.5

    There are currently 2 major persistent weak layers buried within the top 2-4 feet of the snowpack. These layers are failing in the easy-moderate range in stability tests. At the upper elevations weak snow exists even deeper in the snowpack, with slab depths ranging from 4 to 6 feet. 

    These layers formed during cold, dry periods in November and the first half of December. Most of the snow that fell in early November turned into 2 mm facets and was buried around November 27th. A layer of surface hoar and near surface facets was buried earlier in the month of December. Both of these interfaces are showing the propensity to propagate a fracture in stability tests.

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2

    Wind slabs have formed over the last few days with consistent snowfall and light to moderate winds. The Greys picked up around 8 inches of snow in the last 24 hours with winds out of the west. With  an additional 3-5 inches of snow forecasted and W winds gusting into the 30s these slabs could be 1-3 feet deep and sensitive to human triggers. Winds are forecasted to peak sometime before noon and slowly taper throughout the rest of the day. 

    There is plenty of snow available for transport from yesterday and the previous storm cycle. 

Avalanche Discussion

There are currently several weak layers of snow buried within the top 3-5 feet of the snowpack in both the Togwotee and Greys forecast Zones at the middle and upper elevations. Lower elevations in the Greys Zone received a fair amount of rain on December 28th and have since refrozen. With more snow and wind on the way these buried weak layers will continue to get stressed, especially in the Togwotee zone where slab depths and densities are starting to reach a critical level. 

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