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 11 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

This morning the avalanche danger is LOW on all aspects and elevations. Some pockets of MODERATE avalanche danger may form below 9000 ft. on sun-exposed SE-S-SW aspects steeper than 35 degrees as the day warms up, and some small loose wet snow instabilities become possible. The amount of warming that actually occurs today will dictate how widespread these possible wet snow instabilities may be. 

Problemi valanghivi

  • Loose Wet

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

    Any wet snow that formed yesterday should have refrozen last night. This solid refreeze, the fact that the snow has now undergone repeated melting and refreezing, the possibility of some increased afternoon cloud cover, and the low sun angles of Feb. should mean that wet snow instabilities will be smaller and more isolated today. Today's warmer temperatures and mostly clear skies could still cause enough warming for some loose wet snow instabilities to form on the sun-exposed SE-S-SW aspects.  Small pinwheels, roller balls, and point release avalanches (sluffs) should represent the majority of the loose wet instabilities, but a few could entrain enough snow to cause issues for backcountry travelers in isolated areas or extreme terrain. 

Avalanche Discussion

Observations from Incline Lake Peak and Deep Creek showed a well bonded snowpack with 10 to 14 inches of soft snow sitting above a thick firm rain crust on sheltered northerly aspects in near and below treeline terrain. On more exposed near and above treeline terrain wind scoured surfaces, firm wind slabs, icy crusts, and other wind sculpted features existed on the snow surface. On more sun exposed southerly aspects in the Incline Lake Peak and Rose Knob area some old loose wet point releases existed, and at least one skier triggered loose wet point release occurred between 10 am and 2 pm yesterday on a sun-exposed SE aspect at 8600 ft. in the 3rd Creek drainage. 

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