Lawinenlagebericht

Tetons

Bridger-Teton Avalanche Center
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Lawinengefahr

Tue
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Veraltet — dieser Lagebericht ist 3 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Human triggered avalanches are likely today as recent snow with moderate to strong west winds build reactive wind slabs and stress weak layers buried 2-3 feet deep. Look for obvious signs of instability such as cracking, stiffened surfaces and drifts to identify wind slabs in middle to upper elevation. Recent avalanche activity on buried weak layers combined with loading of new snow will warrant careful terrain management while avoiding steep, consequential slopes. 

Lawinenprobleme

  • Wind Slabs

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

    Fresh wind slabs will continually form from sustained wind and 10 inches of new snow with an additional 7 inches today.  Slab depths will range 1-2 feet loading primarily leeward terrain from moderate to strong W/SW winds with high ranges of 25-35 mph. These wind slabs will be most reactive on ridgelines and exposed terrain in the middle to upper elevations.  Monitor the development of new and growing slabs with continued snow and wind throughout the day. Areas with wind slabs could also increase the chance of triggering a larger persistent slab. 

    (2/23/2023) Wind loaded terrain. 

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1.5–2.5

    Numerous soft and hard slab avalanches have been triggered recently on weak layers buried 2-3 feet across all elevations and most aspects. Additional loading of new snow as this storm cycle continues will add stress to these weak layers increasing reactivity. The primary persistent weak layer of concern was buried Feb 18th consisting of facets and crusts. Avalanches have been triggered on this layer on most aspects with the highest concentration from South to East (Wolf Trap, No Name Canyon, Nugget). Wind loaded terrain will also have an increased likelihood of triggering this weak layer. 

    Deeper weak layers buried 2-4 feet are more concerning now in the low to middle elevations as firm cohesive slabs continue to form above this weak snow. Recent avalanches failing on these layers includes Snow King and Taco Bell Couloir. 

    (2/25/2023) 

    Persistent slab on Avalanche Bowl that failed on Feb 18th facet/crust combination. 

Avalanche Discussion

Ground Truthing

The storm cycle continues as consistent snowfall and strong wind gradually increases avalanche danger. Wind slabs will be the most likely problem you will encounter in the mountains today in exposed terrain as they grow in size and reactivity throughout the day. The tougher problem to think about are those buried weak layers, primarily the Feb 18th layer that saw increased reactivity this last week as it woke up during temperature increases. The amount of human triggered avalanches should be a clear sign that this layer deserves respect. Deeper weak layers in the middle and lower elevations also saw increased avalanche activity. Due to the high uncertainty in how all these layers will react to loading of new snow, reassess the terrain you have been riding all season. That unsuspected terrain may cause trouble during these changing conditions. Avoid steep, consequential slopes in the coming days as we assess the growing complexity of the snowpack.

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