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

In sintesi

Early this morning, avalanche danger is LOW for all elevations and aspects. Avalanche danger will quickly increase to MODERATE danger by the mid morning hours for all elevations and aspects in response to daytime warming. Small human triggered loose wet avalanches are expected today. Isolated small natural loose wet avalanches are unlikely but not impossible.

Problemi valanghivi

  • Loose Wet

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

    Overnight minimum air temperatures were well above freezing once again last night and thin high level could cover existed. Snow surface refreeze is expected to be fairly superficial again this morning, having been dependent entirely on weak radiational cooling. A few hours of supportable snow surface conditions are expected early this morning. By mid morning, daytime warming is expected to have caused sufficient snow surface melting to allow for human triggered loose wet avalanches to occur on all aspects.

Avalanche Discussion

Recent observations from around the forecast area have shown that overnight refreezes have been very superficial with residual wet snow remaining below melt-freeze crust 4 inches thick or less in most areas. Melt-freeze conditions have been noted on all aspects at nearly all elevations. Only the very steep, shaded, higher elevation north aspects have escaped significant melt-freeze and snow surface melting. A report of very minor skier triggered roller balls was received yesterday from Bard's Bowl (Bear Valley backcountry) occurring at 10:25am on an open southeast aspect at 7,900'. In recent days, more significant human triggered, roller ball, pinwheel, and small loose wet avalanches were observed on a variety of aspects between 7,000' and 9,000' by noon.

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