Bollettino valanghe

Togwotee Pass

Bridger-Teton Avalanche Center
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Pericolo valanghe

Alta quota
3 · Marcato
Limite del bosco
1 · Debole
Sotto il limite
Senza grado
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Non aggiornato — questo bollettino è scaduto 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Yesterday's very strong winds and continued snowfall has formed soft 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. Above 8000 feet, natural avalanche activity will be possible involving both the new and the deep layers. Cautious route finding is essential today. At lower elevations, avalanches are unlikely except for shallow, isolated, wind loaded pockets.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    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 eighteen inches. They could release naturally today, particularly at the higher elevations as they are further loaded by new and blowing snow and will be sensitive to backcountry travelers all day.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    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 one to three feet at the higher 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 five 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.

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