Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 3 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Triggering avalanches 2.5 to 6+ feet deep remains possible at all elevations on slopes where weak snow lurks below the surface, especially in places where wind-blown snow has piled up above the weak snow. Avalanches could come as a surprise in an area of seemingly stable snow. If you see signs of unstable snow, like recent avalanches, cracking, or collapsing, or if you doubt a slope, using low-angle terrain not connected to steeper slopes can help reduce the chances of triggering an avalanche. The avalanche danger will increase tonight as another storm impacts the area.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3

    Even though obvious signs of unstable snow may have decreased, triggering a large to very large persistent slab avalanche remains possible today. Persistent weak layers exist on various aspects and elevations, ranging from sheltered low-elevation areas to the highest, most exposed slopes. These weak layers include surface hoar, faceted snow, and/or a crust/facet combo buried on Jan 2, facets around the Dec 19 rain crust, and depth hoar near the ground. So far most of the avalanche activity has occurred on the Jan 2 weak layers, but some of the larger avalanches have stepped down to the deeper layers. People can trigger these avalanches from above, below, or to the side of a slope, and they often break wider than expected. These weak layers also exist on slopes where wind slabs typically form and larger persistent slab avalanches could occur in those areas.

    Recent avalanches, snow surface cracking, snowpack collapse, or whumpfing sounds indicate unstable, persistent slabs, but fewer obvious clues may exist today. Triggering an unexpected persistent slab avalanche in an area of seemingly stable snow may be the first and only clue that a slope remains unstable. If you see any signs of unstable snow or have any doubt about a slope, assume it is unstable especially if you also see signs of wind-loading. Using low-angle, non-avalanche terrain not connected to steeper areas above or beside can reduce your exposure to the persistent slab problem.

    (1/14/2024)

    This very large persistent slab avalanche failed in a wind-loaded area and then triggered another failure lower on the slope. It is from near Highland Lakes around Ebbetts Pass.

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