Bulletin d’avalanche

Central Sierra Nevada

Sierra Avalanche Center
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Danger d’avalanche

Alpin
1 · Faible
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 13 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Avalanche danger remains LOW at all elevations on snow covered NW-N-NE-E aspects. Avalanche danger and snow cover are generally nonexistent on SE-S-SW-W aspects.

Problèmes avalancheux

  • Cornices

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

    Even though several weak layers exist in the snowpack, triggering an avalanche remains unlikely because not enough of a load resides above those buried weak layers. The vast majority of data indicates that the shallow and weak snowpack can support itself and people recreating on top of it in its current state. Day to day observations continue to yield a few isolated results indicating instability. This variability means that even though avalanches are unlikely, finding some unstable snow in the form of a small persistent slab on an isolated terrain feature on a NW-N-NE aspect is not impossible. Continue to evaluate the snowpack before committing to a slope and employ safe backcountry travel practices like traveling one at a time and spotting partners from known safe zones outside of any avalanche path. Numerous rocks, trees, stumps, logs and other obstacles remain exposed and could easily injure people or break equipment.

Avalanche Discussion

Observations continue to show a shallow snowpack composed of several layers of weak snow. In some areas slab-like layers exist above weak layers, and in other areas they do not. Overall data and observations indicate that even though many weak layers exist in the snowpack, the snowpack can currently support itself and people recreating on top of it. Yesterday observations from Rubicon Peak also indicated a weak but stable snowpack. Data has shown that the snowpack continues to weaken and that depth hoar (very weak, large grained, sugary snow) exists near the base of the snowpack in some areas. If/when significant snow falls on top of the existing snowpack, these weak layers could create serious avalanche problems. 

Régions couvertes