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

Points saillants

LOW avalanche danger this morning will increase to MODERATE as loose wet avalanches become possible due to a weak refreeze, warm temperatures, and possible rain today. 

During the night natural avalanches will become possible and the avalanche danger will rise to CONSIDERABLE as a strong storm arrives over the region. WIND SLABS, STORM SLABS, and LOOSE WET avalanche problems could become widespread. Expect dangerous avalanche conditions in the backcountry through Saturday. Check back tomorrow morning for the latest updates. 

Problèmes avalancheux

  • Loose Wet

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

    Warm temperatures and cloudy skies last night mean that little to no refreeze may have occurred in some areas. Today's possible light rain and warm temperatures could provide the warming needed to melt through the weak refreeze and allow loose wet avalanches to become possible again. If temperatures and snow levels fall faster than predicted, loose wet avalanches will remain unlikely today. 

Avalanche Discussion

Yesterday areas of wet unsupportable snow existed as early as 10 am in some places below 7500 ft. on Jakes Peak and before 9 am in some areas on Maggies Peak. Above 7500 ft. in both these areas, the snowpack remained mostly supportable until around noon when the weak overnight refreeze completely melted leaving behind deep, wet, unsupportable snow. Glide cracks existed in some areas on S. Maggies Peak. Overall data and observations indicate that the snowpack should remain supportable and consolidated once it refreezes below the forecasted new snow. 

The avalanche danger will increase quickly and dramatically as a strong atmospheric river-type storm arrives over the forecast area starting tonight. Expect wind slabs, storm slabs, and loose wet avalanche problems to become widespread in response to accumulating snow, intense snowfall rates, strong winds, and heavy rain. Human triggered avalanches will become likely tonight and some natural avalanches will be possible. If the storm arrives sooner than expected, these avalanche problems will also form sooner. If for some reason backcountry travel is required tonight, dangerous avalanche conditions will exist. Expect dangerous avalanche conditions in the backcountry tomorrow and Satuday as the storm continues.

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