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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In sintesi

MODERATE avalanche danger will occur at all elevations today as a loose wet avalanche problem develops in response to daytime warming. Evaluate snow surface supportability on an ongoing basis and avoid avalanche terrain in areas where marginally supportable to unsupportable wet snow exists.

Problemi valanghivi

  • Loose Wet

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

    As daytime warming progresses, loose wet avalanches will become possible at all elevations on E-SE-S-SW-W aspects. Further into the daytime hours, this loose wet avalanche problem will spread to NW-N-NE aspects as well. Avalanche size up to D2 is possible (large enough to bury or injure a person). Identify and avoid avalanche terrain in areas where natural or human triggered roller balls are occurring and/or marginally supportable to unsupportable wet snow exists.

    Skies were clear over the forecast area for the majority of last night and SW winds kept air temperature inversion conditions to a minimum. As a result, a fairly good snow surface refreeze is expected to have occurred overnight. Areas of unstable wet snow will likely be a little slower to form today as compared to the past several days, but will still form by the afternoon hours. Pay close attention to the remaining thickness of surface crust as the day progresses. Once it becomes marginally supportable to unsupportable, the snowpack can quickly become unstable.

Avalanche Discussion

* Recent observations from around the forecast area continue to show increasingly well established melt-freeze conditions on E-SE-S-SW-W aspects. The snowpack remains transitional having undergone only very superficial melt-freeze on many NW-N-NE aspects at the upper elevations. Lower elevation NW-N-NE aspects hold fairly well established melt-freeze conditions.

* Snowpit tests performed Sunday on Silver Peak (Pole Creek area) in the crown of one of the numerous deep slab avalanches from March 22 indicated that the associated weak layer continues to retain characteristics that allow for propagation. No signs of current deep slab instability were observed.

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