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

Avalanche danger will quickly rise to MODERATE at all elevations and on all aspects as the day warms up. Human triggered loose wet avalanches are expected today. Natural avalanche activity is unlikely but not impossible.

Problèmes avalancheux

  • Loose Wet

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

    Some overnight cloud cover and temperatures well above freezing mean that last night's refreeze should have been thin and weak at best. The sunshine and warm temperatures today should quickly melt through this thin refreeze leaving unsupportable wet snow behind. Once this happens the loose wet snow avalanche activity will become possible on all aspects. Most of these loose wet avalanches should remain relatively small, but even small ones can still push a person into an area with other consequences or could become more serious in areas where terrain traps exist. Some larger wet snow instabilities are not impossible especially if the thunderstorms materialize and rain falls on the snowpack.

Avalanche Discussion

Yesterday on Castle Peak, 30 to 40 cm of wet snow existed on E-SE aspects below 8500 ft. by 10 am. The thin refreeze lasted longer on the SW-W aspects and 3 to 5 cm of soft corn snow existed on top of a thin but supportable refrozen melt-freeze crust on these aspects until at least 11 am. In tree covered areas where the snowpack could not radiate heat out into space the refreeze was either nonexistent or very thin. The snow in these areas remained wet and unsupportable on all aspects. On more open northerly aspects a refrozen surface crust existed above drier snow.

Régions couvertes