Bulletin d’avalanche

Togwotee Pass

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
Sans niveau
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Périmé — ce bulletin a expiré 5 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Today, avalanche conditions are dangerous. Recent snowfall of over 25 inches this week and strong winds have formed new surface slabs on leeward slopes and added stress to deeply buried weak layers. Natural avalanches are still a possibility and human-triggered avalanches are likely. After this most recent loading event, avalanche activity on the December 5 interface is a reminder of the persistent nature of this layer. Along with the high consequences of the persistent slab problem, wind-loaded slopes have the potential to result in large avalanches. In managing these avalanche problems, it is important to avoid wind-loaded terrain, stay out from under avalanche terrain, and avoid avalanche runouts. At the lower elevations, human-triggered avalanches are possible on steep terrain features.

Problèmes avalancheux

  • Wind Slabs

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

    Sustained southerly to westerly winds in the 30s and 40s with strong gusts to the valley floor have redistributed the snow and formed wind slabs at all elevations. The gusty nature of these winds have formed unusual loading patterns, making it important to evaluate terrain features with recent wind effect. These slab avalanches could be 1 to 3 feet in depth with the deeper slabs favoring the upper elevations. If triggered, a wind slab avalanche could then initiate failure on deeper buried weak layers.

  • Persistent Slabs

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

    Weak layers of snow now buried between 1 to 5 feet deep have been stressed and tested over the last five days. Evidence of recent avalanche activity indicates this layer is still reactive to being triggered. These slides could be triggered by a single person from a thin part of the slab or by large loads such as snowmobiles and wind slab avalanches. Due to the severe consequences of involvement in an avalanche of these depths, the best approach to this uncertainty is avoidance.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )The storm that lasted several days will exit the forecast area tomorrow as high pressure builds over the region. Cloud cover will lessen throughout the day from mostly cloudy to partly cloudy, and snowfall should taper off by mid-morning. In wake of today’s cold front, temperatures will cool into the single digits to low teens in the mountains and upper teens to twenties in the valleys. Westerly ridgetop winds are expected to be 15 to 20 miles per hour with gusts into the twenties. For tomorrow, the hazard rating is expected to be Considerable and avalanche conditions remain dangerous. The hazard rating will slowly decrease as snowfall comes to an end and winds lessen. That being said, natural avalanches are still a possibility and human-triggered avalanches are likely.Recent snowfall and strong winds have formed new surface slabs on leeward slopes and added stress to deeply buried weak layers. Avalanche activity on the December 5 interface, after this most recent loading event, is a reminder of the persistent nature of this layer. Slab depths could be up to 10 feet, although these slides are more likely to be triggered from areas where the slab is thinner. In managing this avalanche problem, it is important to stay out from under avalanche terrain and avoid avalanche runouts.

Régions couvertes