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 10 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. Areas of MODERATE avalanche danger will form on slopes 35 degrees and steeper on all aspects at all elevations as loose wet avalanche problems develop in response to rapid daytime warming.

Problemi valanghivi

  • Loose Wet

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

    With clear skies last night, a decent snow surface refreeze is expected to have occurred due to radiational cooling despite above freezing air temperatures above 6,500'-7,000'. This superficial snow surface refreeze is expected to allow for a widow of supportable travel conditions early this morning. Rapid warming will melt this crust and create surface wet snow on all aspects as the day progresses. As supportability of the snow surface crust diminishes, loose wet avalanches will become an increasing possibility as deeper wet snow below the crust is exposed.

    Avoid late starts today and evaluate carefully any desire to travel in avalanche terrain during the mid day and afternoon hours. Step off of equipment from time to time to gage the depth of body weight boot penetration into wet snow. Once boot penetration depth reaches 8 to 10 inches or more, conditions are becoming problematic. Once signs of deep wet snow are present, exit avalanche terrain by moving to slopes less than 30 degrees is slope angle without steeper terrain above.

Avalanche Discussion

Observations made yesterday on Rubicon Peak (West Shore Tahoe area) revealed that on E aspects below 8,800' and on N aspects below 8,000', recent storm snow had fully assimilated with the older melt-freeze surface. Above these elevations, up to 1.5 inches of remnant storm snow was observed during the morning hours. This snow likely became wet during the afternoon hours. On E aspects at 8,500', signs of a good snow surface refreeze existed with a surface melt-freeze crust of 6 to 8 inches thick. Looking west into Desolation Wilderness, signs of recent loose wet avalanche activity were present in sun exposed areas.

Regioni coperte