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

In sintesi

Numerous avalanches were reported yesterday throughout the forecast region.  Human triggered avalanches will remain possible today due to wind slab and loose dry avalanche problems.  MODERATE avalanche danger will exist at all elevations.

Problemi valanghivi

  • Wind Slabs

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

    Reactive wind slab avalanches were reported throughout the forecast area yesterday.  These wind slabs could remain sensitive to human triggering today on NW-N-NE-E-SE aspects in near and above treeline areas.  Many of these wind slab avalanches were failing on weaknesses within the new storm snow and were around 1 to 2 feet deep.  Although, wind slabs were observed up to 3 feet deep in some areas with failure closer to the new snow/old snow interface.  SW winds decreased in speed last night after continued snow transport up to that point.  Winds are forecasted to remain light throughout today.

    Look for previous signs of wind transport.  Large and fragile cornices have been built out above wind loaded slopes.  Wind slab avalanches could continue to propagate wide and efficiently.  Good snow quality will exist in below treeline areas away from the wind slab hazard. 

  • Wet Slabs

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

    Continued cold temperatures, light winds, and additional low density snowfall will continue to make loose dry avalanches possible.  Loose dry sluffing could occur on all aspects in wind protected below treeline and near treeline areas.  These loose dry avalanches are expected to be mostly small in size and occur on slopes steeper than 35 degrees.  The main hazard with this loose dry sluffing would be secondary exposure-taking a ride or being pushed into trees, rocks, or over cliffs.    

Avalanche Discussion

Wind slab avalanches were reported yesterday from Andesite Peak, Deep Creek , Powderhouse Peak, Mt. Tallac, and Muchkins in the Five Lakes area.  All of these were human triggered wind slab avalanches and varied from 1 to 3' deep.

An avalanche was reported from the Cabin Creek area with limited details.  Reports indicate that a skier triggered wind slab avalanche may have stepped down to a deeper weak layer causing a much larger avalanche.  No one was caught.

Loose dry sluffing was reported throughout the forecast region with low density storm snow.  The storm snow was made up of several different layers of graupel.  No reports of buried surface hoar under this storm snow at this point.  

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