Bulletin d’avalanche

Togwotee Pass

Bridger-Teton Avalanche Center
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Danger d’avalanche

Mon
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 4 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Triggering an avalanche remains possible on weak layers of snow buried at the base of the snowpack. These layers are widespread but are more sensitive in shallow areas above 9000' where a firm cohesive snow has formed in the snowpack. Look for areas that have been previously wind loaded as well as obvious signs of instability such as cracking or audible collapsing of weak layers.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Weak layers of snow formed in November and December are buried within the snowpack. The depth of these layers vary drastically, from 1-3 feet in shallow areas to 3-4 feet in deeper areas. These weak, sugary facets are widespread across most aspects and elevations with increased sensitivity in shallow areas above 9000’ that contain a firm cohesive slab. Depth hoar is developing at the base of the snowpack in specific areas. 

    Dig down in the snow to check how deep these weak layers are buried. In general, weak layers over a meter will be more difficult to trigger. Avoid those wind loaded and shallow areas in the upper elevation to reduce the uncertainty of persistent slab avalanches.

    (1/20/2023)

    Common avalanche slope. Failed on persistent weak layer 2-3' deep. 

    Photo: Penterson

Avalanche Discussion

The persistent slab problem continues to highlight the avalanche concerns on Togwotee. This problem can be difficult to manage due to the unpredictable nature of these avalanches. During our observations, we’ve been finding shallow areas that contain firm cohesive slabs above 9000’ are the most sensitive to triggering. Remember that tracks on a slope could be a deceiving characteristic of stability. Two days ago, an avalanche on Barbers Point near Brooks Lake Lodge was reported. This slope constantly avalanches throughout the winter, by both natural and human triggers. Pay attention to these repeat avalanche slopes if you frequent Togwotee. You will start to notice a trend in hot spots such as Maverick Creek, Mt Leidy, and West Angle to name a few others. 

Régions couvertes