Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

LOW avalanche danger will transition to MODERATE avalanche danger as solar radiation and warming quickly increase this morning.  Loose wet avalanches will be likely at all elevations today.

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1

    Below freezing air temperatures along with mostly clear overnight skies should provide a good refreeze of the snow surface.  As solar radiation and warming temperatures increase quickly this morning, loose wet avalanche activity will become likely on all aspects and elevations.  Most loose wet avalanches will involve the recent storm snow and be D1 in size with the possibility of up to size D2 in isolated areas.  Loose wet avalanches are expected to run efficiently on the previous surface crust below the recent storm snow.

    Monitor snow surface and warming conditions.  Roller balls and pinwheels will be an indication that the snow surface is losing strength and larger loose wet avalanches could occur.  Terrain traps will increase the consequences of being caught in even a small loose wet avalanche.    

Avalanche Discussion

*  Widespread loose wet avalanches occurred yesterday on Hidden Peak, West Shore area.  These were both natural and human triggered up to size D1.5.  While most of these were small in size involving only the recent 3-4'' of storm snow, they ran fast and efficiently on slopes 35 degrees and steeper.  Little to no refreeze of the snow surface occurred below 8000'.

*  Observations from Powderhouse Peak, Luther Pass area, showed mostly dust of crust conditions.  1'' of new storm snow existed below 8500' with mostly wet unfrozen surface snow and up to 3'' above 8500' with firm refrozen surface crusts below the storm snow.

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