Bulletin d’avalanche

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Danger d’avalanche

Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
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Périmé — ce bulletin a expiré 7 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Yesterday's very strong winds and continued snowfall has formed soft to hard slabs on a variety of aspects and elevations. Additional snowfall and strong winds that will occur today will add to this surface slab problem and will also further load deep weaknesses in the snowpack. At higher elevations, natural avalanche activity will be likely involving both the new and the deep layers. Backcountry travel is not recommended. At lower elevations, identify steep terrain features where loading has occurred and be aware of the run out zones of large avalanche paths.

Problèmes avalancheux

  • Wind Slabs

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

    Very strong south to southwest winds and new snow have formed wind slabs in steep leeward terrain at all elevations. These slabs lie upon recent density breaks within the upper portion of the snowpack and could have depths of up to three feet. They could release naturally today, particularly at the higher elevations as they are further loaded by new and blowing snow and will sensitive to backcountry travelers all day.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Hard slabs could be triggered by moving surface snow or by the weight of a person impacting a weak spot on a slope. These slabs could fail on two distinct weak layers. The higher layer was buried at the start of the new year and could release with depths of two to four feet at the upper elevations and with depths to two feet at the lower elevations. This buried weak layer lies on a variety of aspects and is made up of surface hoar, buried faceted snow, and on south facing aspects, crusts. A deeper pronounced weak layer was buried on November 25th. This hazard is limited to north facing terrain at 8000 feet and as elevation increases, involves more aspects. At 9500 feet west, north and east facing slopes can have this weakness. If triggered, slabs involving this layer could have depths to six feet.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )Snowfall is to increase again tonight and be heavy at times between midnight and 5pm Tuesday. Another ten or more inches of snow is possible during this time. Southwest winds are expected to have averages between twenty-five and thirty-five miles per hour with higher gusts. Temperatures are to remain cold at higher elevations with lows in the single digits and highs in the low teens. The avalanche danger will likely remain High at the upper elevations of the Tetons and could increase to High in the Southwest Trails and Togwotee Pass areas depending on the amount of new snow and wind received overnight and through the day. Wind loaded slopes will be sensitive to backcountry riders and skiers on a variety of aspects and elevations and could release naturally. Slabs are most likely to initiate as newly formed soft slabs but the potential also remains to trigger deep weaknesses in the snowpack. These slabs could fail after a soft wind slab is triggered or possibly by the weight of a single person finding a weak spot on a slope. Slab depths could vary from on foot to six feet at higher elevations, depending on which layer fails and on snow depths in that location. At lower elevations, slabs to two feet could be triggered.

Régions couvertes