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
1 · Debole
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Non aggiornato — questo bollettino è scaduto 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Wind last night created the possibility for drifting snow and new wind slabs in some areas today. This has caused an increase to MODERATE avalanche danger for near treeline and above treeline areas. In wind protected areas below treeline, LOW avalanche danger continues.

Problemi valanghivi

  • Wind Slabs

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

    Ridgetop winds out of the SSW picked up to the 30 to 50 mph range for about 9 hours last night along the Sierra Crest in the northern half of the forecast area. Plenty of snow on the ground was available for wind transport last night above 8,000' in near treeline and above treeline areas. New wind slabs are expected to have formed last night above 8,000' on NW-N-NE-E-SE aspects along the Sierra Crest in the northern half of the forecast area. Look for signs of newly formed wind slabs by identifying clues of wind drifted snow such as cornices, wind pillows, snow surface texture, and scouring vs loading patterns causing differing snow depths on either side of ridgelines. Move cautiously around any areas where newly formed wind slabs exist.

    Near and above treeline areas that did not receive significant winds last night will soon. As ridgetop winds increase to 40 to 80 mph out of the S tonight and tomorrow, widespread areas of wind drifted snow will increase the size and distribution of wind slabs across the forecast area.

Avalanche Discussion

Recent observations from around the forecast area show a right side up snowpack around 2.5 to 5 feet deep in most locations above 7,000'. Continued strength gains have been noted in the bottom and middle portions of the snowpack. Areas below about 8,000' have been affected by recent rain and warming.  Expect to find some surface crusts below 8,000' as the wetted snowpack has begun to refreeze. Above 8,000' the snowpack becomes progressively drier.

Regioni coperte