Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Early season conditions with a thin snowpack and numerous obstacles to potentially hit will remain the greatest hazard today.  LOW avalanche danger continues with normal caution advised if traveling in the backcountry.  

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1

    Caution is advised when traveling in the backcountry due to the thin snowpack and variable snow conditions.  Many obstacles such as rocks, bushes, and small trees are exposed or barely covered under the snow surface presenting the greatest hazard to backcountry users.  Variable snow conditions range from wind scoured surfaces in wind exposed near and above treeline areas, soft unconsolidated snow in wind protected below treeline terrain, and a variety of crusts scattered throughout.  Firm snow surfaces may present falling hazards in exposed areas.

    Avalanche activity remains unlikely today. 

Avalanche Discussion

A mostly supportable snowpack 1-2 ft. deep exists on northerly aspects above 8600 ft. in the Mt. Rose area, above 7000 ft. along the northern Sierra Crest, and above 8000 ft. along the southern Sierra Crest.  Highly variable snow surface conditions exist with wind scoured snow in most near and above treeline areas, soft unconsolidated snow in wind protected below treeline areas, and a variety of surface crusts mixed in.

Most all usable snow exists on northerly aspects, with most southerly aspects having snow melt and loss with large areas of bare ground.

The faceting process has continued throughout this dry period with mostly clear skies, cold long nights, and low sun angles, since our last storm on Nov 18.  This extended dry period has created weak sugary snow that is most prominent just below the surface of our shallow snowpack.  As storms are in the forecast, the concern continues that this weak snow will not be strong enough to support much additional load.  As storms start to load this weak snow, it could potentially become a buried weak layer that could lead to avalanches in the future. 

Regioni coperte