Boletín de aludes

Salt River and Wyoming Ranges

Bridger-Teton Avalanche Center
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Peligro de aludes

Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 12 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

The general avalanche hazard is MODERATE and will be increasing at all elevations today. Rising temperatures and new loading could create unstable conditions in steep terrain. Dense surface slabs will form upon persistent weak layers comprised of buried surface hoar. These persistent weak layers are a game changer. Small slab avalanches were unintentionally triggered by several different skiers yesterday in the Teton Range. These events included slabs that were triggered by the 3rd and 4th skiers on a slope and an event that occurred on a low angle slope. All of these events likely involved buried surface hoar. The likelihood for humans to unintentionally trigger slab avalanches will be increasing and is problematic. As these slabs gain depth and volume the potential for serious injury will increase.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    West-southwest winds have formed dense surface slabs on layers of surface hoar that were buried on January 16, 11 and 2. These buried persistent weak layers are potential failure surfaces for slab avalanches. These surface slabs will become increasingly sensitive to human triggers and are likely to fail on the January 16 or 11 layers with depths up to a foot. Some potential may exist for these slabs to step down to the January 2 layer with depths up to three feet. Shallow wet loose slides and pockets of dense or wet surface slab up to a foot deep are possible in steep terrain at the lower elevations.

Avalanche Discussion

( Discussion is generated from the previous day's afternoon forecast. )A most west flow will bring Pacific moisture and warm air into the region. Periods of heavy snowfall are expected to develop overnight and continue into the evening. This flow will favor the Teton Range and the southern ranges of Yellowstone National Park. Six to 12 inches of new snow are possible by Monday morning. This snowfall will be accompanied by strong west-southwest winds with gusts to 50 miles per hour and rising temperatures. The snow may mix with rain at the lower elevations. Temperatures will rise well into the 20s at the higher elevations and into the low 30s at the mid elevations.The new snow, wind, rising temperatures and buried layers of surface hoar will combine to increase the general avalanche hazard as the day progresses. Surface slabs will build on leeward aspects during the day and are expected to become very sensitive to human triggers in areas where rapid loading occurs. Due to the fickle nature of buried surface hoar remote triggering may occur on some slopes while other slopes my not be triggered until they have been crossed by multiple persons. These new surface slabs could reach depths of one to two feet during the day. The general avalanche hazard at the mid and upper elevations could increase to CONSIDERABLE in areas that experience sustained heavy snowfall and is likely be increasing but remain MODERATE in areas that get less snowfall. A lower hazard is anticipated below an elevations of 7,500 feet. Monitor conditions and adjust plans accordingly.

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