Bulletin d’avalanche

Central Sierra Nevada

Sierra Avalanche Center
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Danger d’avalanche

Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Périmé — ce bulletin a expiré 7 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Gale force winds and periods of high-intensity snowfall (especially tonight) will keep HIGH avalanche danger in near and above treeline terrain. The avalanche danger is CONSIDERABLE in below treeline terrain. Avalanche activity is very likely. Travel in avalanche terrain is not recommended. 

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2

    The wind slabs that started forming yesterday will become larger and more widespread today due to continued gale force winds and additional snow accumulation. NW-N-NE-E-SE aspects in near and above treeline terrain should hold the largest of these wind slabs but some could also exist in exposed below treeline areas as well. Wind slab avalanches will be likely today and should become very likely as the storm reintensifies tonight. Some wind slabs could start in traditional start zones near ridgelines and run into below treeline terrain.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1

    Changing conditions during the storm and periods of rapid snow accumulation mean that human-triggered storm slab avalanches will also be likely today and tonight. A chance for rising temperatures today could also exacerbate the storm slab problem. Storm slabs could exist on any steep slopes and could be large enough to bury or injure a person especially in areas that have received the most storm snow. In areas where less new snow exists storm slabs may be less prevalent.

Avalanche Discussion

* Observers reported strong winds and blowing snow along the Sierra Crest and in the Mt. Rose backcountry yesterday.

* Some small fragile wind slabs had started to form in the Deep Creek area and on parts of Fireplug. 

* One party on the west shore noted a recent wind slab avalanche on Peak 9269. 

* Observations from Deep Creek, Fireplug, and the West Shore did not reveal signs of instability other than the newly forming wind slabs. 

Régions couvertes