Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Alta montaña
1 · Débil
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Desactualizado: este boletín caducó 13 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Near treeline and below treeline avalanche danger remains MODERATE on NW-N-NE aspects on slopes steeper than 32 degrees due to lingering persistent slab instability.

Human triggered avalanches remain possible. 

Problemas de aludes

  • Deep Persistent Slabs

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

    Persistent slab instability remains ongoing near treeline and below treeline on NW-N-NE aspects. The faceted Dec 7 persistent weak layer is slowly gaining strength, but not enough to make much difference in terms of reducing avalanche danger. Between the lingering persistent slabs and the shallow snow cover over rocks, logs, and other objects, significant hazard exists in the backcountry.

Avalanche Discussion

Observations made yesterday on Red Lake Peak (Carson Pass area) matched well with other recent observations from around the forecast area. Persistent slab instability lingers near treeline and below treeline on NW-N-NE aspects. The Dec 7 facet layer is buried under a fairly well consolidated slab and remains reactive in snowpit tests. Once this weak layer collapses, it has the necessary characteristics to allow a fracture to propagate through the snowpack.

Spacial variability is increasing around the forecast area in regards to stability improvements of the Dec 7 faceted weak layer. The amount of force required to trigger weak layer collapse and the ability for the weak layer to propagate are becoming more variable from one location to another. In some spots, strength increases in the Dec 7 persistent weak layer are highly evident while in other areas the strength gains have been much more modest. Either way, the data still indicates that human triggered avalanches are possible in many locations around the forecast area.

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