Bulletin d’avalanche

Central Sierra Nevada

Sierra Avalanche Center
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Danger d’avalanche

Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 12 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Some pockets of MODERATE avalanche danger may form at all elevations and on all aspects as the day warms up. Due to cooler weather and northeast winds the wet snow instabilities that form today should remain smaller and less widespread than those that have formed on previous days. Still, small human triggered loose wet avalanches will remain possible today in some areas. Natural avalanche activity is unlikely but not impossible.

Problèmes avalancheux

  • Loose Wet

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

    Clear skies and slightly colder temperatures last night should have allowed a slightly more robust refreeze to occur in most areas. Today's northeast winds and slightly cooler daytime highs should also help this refreeze to last longer. In spite of these cooling factors, the intense sunshine and temperatures in the upper 40's may allow enough melting to occur for some wet snow instabilities including pinwheels, roller balls, and loose wet snow point release avalanches to become possible. Most of these loose wet avalanches should remain small, and they should remain more isolated in distribution today due to the cooler weather and northeast winds. Slopes that experienced weaker refreezes last night will hold the best possibility for wet snow issues today.

Avalanche Discussion

Yesterday on Becker Peak about 15 cm (6 in) of wet unconsolidated snow existed on top of a supportable melt freeze crust on the sun exposed SE-S-SW aspects. This underlying melt freeze crust remained supportable well into the afternoon on these aspects. On the northerly aspects the snowpack became wet and unsupportable by the afternoon and stepping off of one's skis resulted in sinking thigh deep into wet snow. Farther north on Incline Lake Peak the supportable melt freeze crust melted away by noon leaving shin deep wet snow on all aspects. Ski cuts on steep test slopes triggered small roller balls, pinwheels, and some wet snow sluffs in this area by 12:30 pm. 

Régions couvertes