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 7 years ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

LOW avalanche danger early this morning will give way to MODERATE avalanche danger at all elevations today as a loose wet avalanche problem develops in response to rapid daytime warming.

Problèmes avalancheux

  • Loose Wet

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

    Another night of near to above freezing air temperatures at the mid and upper elevations will once again give a head start on the development of a loose wet avalanche problem today. Rapid warming conditions are again expected by mid morning. Once the surface crust has melted away, loose wet avalanches are possible. The vast majority of loose wet instability is expected on E-SE-S-SW-W aspects at all elevations. This avalanche problem may spread onto NW-N-NE aspects in isolated areas, mainly at low elevations. Avalanche size is expected mostly at D1 with up to size D2 possible.

    For most areas, the transition from a frozen snow surface to a thin wet layer over dry snow will occur quickly today and is prone to loose wet avalanches. Pay close attention to the snow you are traveling on. If it is wet snow on top of dry snow with no crust in between, choose lower angle slopes and avoid steep terrain.

Avalanche Discussion

* Daily reports of a few loose wet avalanches size D1 to D1.5 continue around the forecast area on steep sun exposed slopes.

* Transitional snow surface conditions still exist on many E-SE-S-SW-W aspects with a thin layer of wet snow over dry snow. In some areas, this is getting close to a corn setup. In most locations, it is not there just yet.

* NW-N-NE aspects hold a mix of wind affected surfaces, unconsolidated snow yet to be affected by melt, and breakable crust depending on elevation and exposure to sun and past wind events.

* The deeper existing snowpack is generally well consolidated and lacks widespread problematic weak layers.

Régions couvertes