Bollettino valanghe

Tetons

Bridger-Teton Avalanche Center
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Pericolo valanghe

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

In sintesi

Warmer air from the southwest has started advecting into the region, and mountain temperatures rose overnight. Over the past few days, skiers have triggered several small to large soft slabs in steep, wind loaded terrain. Some of these avalanches resulted in near misses. Similar slides could be triggered today at the mid and upper elevations, and daytime warming and sunshine may increase this hazard. If extended periods of sunshine occur, the chance for shallow wet slides could also develop on sunlit aspects. Monitor temperatures and the sun’s impact on snow surfaces, and transition to shaded terrain if snow surfaces start to become wet. The low probability/high consequence event of triggering a persistent deep slab avalanche still warrants mention. The snowpack is mostly stable at the lower elevations, and avalanches are unlikely.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    In steep, wind loaded terrain above 7,500 feet, skiers and riders could trigger recently developed wind slabs ranging in depth from one to two feet. As the day warms, these slabs may become more susceptible to failure. This increase in hazard will be a balancing act between the amount of solar input and the cooling effect of the wind. Terrain that concentrates the sunshine and is also sheltered from strong winds will be the most suspect.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    2–3

    A slight chance remains for backcountry travelers to trigger persistent deep slab avalanches above 7,500 feet. With depths ranging from three to seven feet, these avalanches are likely unsurvivable. A snowmobiler impacting a shallow portion of the snowpack will be the most likely scenario of triggering one of these destructive avalanches. A cornice drop or the release of wind slab could also initiate one of these slides.

Avalanche Discussion

Cloud cover will increase overnight ahead of the next Pacific storm system, and skies will become overcast by morning. This system will move in from the northwest to the southeast, and moderate to heavy snowfall could begin by Sunday afternoon. Overnight lows in the mountains will be in the low 20s before rising into the upper 20s during the day. Valley temperatures will drop into the mid-20s tonight and then rise into the mid-30s in the afternoon. Ridgetop winds will back to the southwest and decrease to 15 to 25 miles per hour.The general avalanche hazard is expected to be Moderate above 7,500 feet on Sunday. Up there, skiers and riders could trigger small to large wind slabs in steep, wind loaded terrain. In the afternoon, new shallow winds slabs will begin to form on a variety of snow surfaces, which include wind pack, sun crusts and settled snow. The low probability/high consequence event of a persistent deep slab avalanche cannot be ruled out. With below freezing temperatures overnight at all elevations, the threat of wet slides will abate, and avalanches will be unlikely below 7,500 feet.

Regioni coperte