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

MODERATE avalanche danger will form on slopes steeper than 35 degrees on the sun exposed SE-S-SW aspects and pockets of MODERATE danger may form on the E and W aspects. Loose wet avalanches will become possible again today due to daytime warming and strong March sunshine.

Problèmes avalancheux

  • Loose Wet

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

    Loose wet snow instabilities will again become possible today as the strong spring sunshine and daytime highs in the upper 40's to low 50's above 7000 ft. melt and soften the upper part of the snowpack. The majority of wet snow instabilities that do occur today should remain limited to small roller balls, pinwheels, and small wet snow sluffs. However, a few isolated wet snow instabilities could entrain enough snow to cause problems for backcountry travelers.

Avalanche Discussion

Yesterday a few inches of soft melt/freeze snow existed above a still frozen crust on the SW and W aspects between 3 and 5 pm from 7400 ft to 8500 ft in the Underwood Bowl area near Bear Valley. Reports from earlier in the day indicated that the S-SE-E aspects had softened much earlier and that deeper unsupportable wet  snow existed on the S aspects during the hottest part of the day. The E-SE-S aspects started to refreeze by late afternoon.

On the northerly aspects and on shaded areas on other aspects the surface remained frozen throughout the day. A natural cornice collapse did occur on a wind loaded N-NE facing slope near 8500 ft. This cornice collapse did not trigger any signs of slab instability on the wind loaded slope. Snowpit tests and data on a similar wind loaded test slope showed a strong and stable snowpack below a firm, frozen rain crust.

Régions couvertes