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

MODERATE avalanche danger will exist at all elevations today.  Wind slabs that formed yesterday will be a concern in near and above treeline areas.  Loose dry avalanches will be possible in below treeline areas.  Human triggered avalanches are possible today.

Problemi valanghivi

  • Wind Slabs

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

    Strong to gale force SW winds yesterday and last night have created wind slabs on NW-N-NE-E-SE aspects in near and above treeline terrain.  4 to 15'' of new snow has fallen throughout the area and has been available for wind transport.  Winds have shifted to the SE this morning and are forecasted to be light through today.  Wind slabs that were formed yesterday could still be reactive to human triggering today.

    Signs of wind slab avalanche problems will include: recent wind slab avalanches, new cornices, wind pillows, shooting cracks in wind loaded terrain, and snow surface scouring.  Newly formed wind slabs could be multiple feet deep in areas that received the higher end snow totals yesterday.

  • Wet Slabs

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

    Recent storm snow from yesterday is mostly right side up with the storm starting out warm and ending colder.  Winds decreased into the early morning hours as snowfall continued.  In steep below treeline terrain, loose dry avalanches will be possible today.  These are generally expected to be small surface sloughs, but could be large enough to take a backcountry user for a ride.  Loose dry avalanches could run fast and be especially problematic in areas with secondary exposure, terrain traps, or complex terrain. 

    In areas where sloughing is occurring, use good terrain management techniques to limit exposure to other obstacles such as rocks, cliffs, or trees. 

Avalanche Discussion

On Rubicon Peak, West Shore area, the new storm snow bonded well to the variety of snow surfaces.  Moderate wind transport was observed with only minor wind slab development and few signs of instabilities in the newly formed wind slabs.

Convective snow showers were reported from the Donner Summit area.  Moderate to heavy snowfall occurred with multiple breaks through the mid day with strong SW winds. 

 

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