Bulletin d’avalanche

Central Sierra Nevada

Sierra Avalanche Center
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Danger d’avalanche

Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Périmé — ce bulletin a expiré 10 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Considerable avalanche danger will continue throughout the forecast area as another storm impacts our region.  Wind slab and storm slab avalanche problems will be very likely at all elevations.  Natural triggered avalanches will be possible and human triggered avalanches will be likely.  Dangerous avalanche conditions exist.  Conservative decision making and terrain choices are critical today.

Problèmes avalancheux

  • Wind Slabs

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

    Strong to gale force S/SW winds will form wind slabs on W-NW-N-NE-E-SE aspects near treeline and above treeline.  In some areas, these wind slabs will continue to build in size from yesterdays storm creating potential large and destructive wind slab avalanches.

    Avoid steep wind loaded terrain.  Look for blowing snow, cornice formation and wind pillows as clues to where wind slabs exist.

  • Loose Dry

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

    Storm slab avalanches will be likely on all aspects near treeline and below treeline today.  An additional 8 to 12'' of new storm snow is forecasted above 7000'.  This new storm snow will have difficulty bonding to our existing snowpack and there could also be weakness within the new storm snow.

    Signs of storm snow instabilities could be snow surface cracking, snow collapsing, and whumpfing.  Avoid slopes steeper than 30 degrees in areas where signs of unstable storm slabs are present.

Avalanche Discussion

Observations were made and received from Jakes Peak (West Shore area) and from Shirley Canyon (Squaw Valley area).  Reactive skier triggered storm slab avalanches occurred at both locations with many natural storm slab avalanches observed.  These storm slabs were in the 6 to 12'' range and grew larger throughout the day.  On Jakes Peak, snowpack tests showed additional weakness deeper within the storm snow but no avalanche activity was observed on these deeper layers.  Moderate to strong snowfall continued throughout the morning and into the afternoon on the West Shore with storm snow approaching 2 feet at the higher elevations. 

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