Lawinenlagebericht

Togwotee Pass

Bridger-Teton Avalanche Center
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Lawinengefahr

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

Kernpunkte

Human triggered avalanches remain possible at all elevations today. Persistent slabs could activate due to the new snow that fell yesterday, with layers that are burieddeep in the snowpack becoming more reactive. Avalanches will be most likely in steep and wind-loaded terrain. Looks for signs of wind affect like drifting or cornices and cracking or collapsing. Slabs up to 3' thick triggered today could bury a person.

 

Lawinenprobleme

  • Persistent Slabs

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

    Lingering beneath a hard slab and new snow lies weak layers buried 2-3’ deep. The Feb 18th layer is our main concern.  This layer is composed of a facet, crust combination found on solar aspects. Many areas of Togwotee also harbor weak, sugary facets across all aspects. New snow and fresh wind slabs will stress these buried weak layers and increase the chance of triggering a large avalanche. Terrain with an increased likelihood of triggering one of these avalanches includes:

    • Shallow snowpack: Weaker buried layers of snow .
    • Wind-affected: Terrain where wind has formed firm, cohesive slabs of snow.
    • Steep: Over 35° slopes.

    Many cornices are reaching their zenith for the season. Be aware that these large cornices often break further back than anticipated and can trigger unusually large avalanches for the given conditions. 

    Mocassin Basin 9500' E aspect

    Photo: Cory Beattie

  • Wind Slabs

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

    Fresh wind slabs that are 1-3 feet thick exist on many aspects at the middle and upper elevations. These slabs are primarily 4F to 1F in hardness and rest on top of fist-hard decomposing snow from the powder cycle prior to the most recent atmospheric river. 10" of new snow has fallen in the past 48 hours which is ample snow to buyild dangerous wind slabs. These wind slabs could be hard and stubborn to trigger and large in wind exposed areas like Angle Mountain and softer but easier to trigger in more sheltered terrain like Maverick Creek or Two Ocean mountain. 

     

    (3/15/2023)

    This observer found a small slab that had failed naturally. 

Avalanche Discussion

Recent avalanche activity has included persistent slabs up to size 2 with crown depths ranging from 1-5 feet. Cornices are very large now so stay further back than you might think becessary. A cornice fall triggered a D2 avalanche recently so beware of this overhead hazard near cliff bands where these cornices are present, especially when the cliff is in the sun. Cornices can fail naturally and without warning. 

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