Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Thu
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 5 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Sunny skies and warmer temperatures will make a loose wet avalanche problem develop as daytime warming occurs at all elevations.  MODERATE avalanche danger will exist for the forecast area today.    

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Warmer daytime temperatures with mostly sunny skies should develop more loose wet instabilities today as daytime warming occurs.   These loose wet instabilities could occur on any aspect or elevation with the increased March sun angles.  Increasing cloud cover throughout the day could limit snow surface warming in some locations.  Roller balls and pinwheels will be indications that rapid warming is occurring and that larger loose wet avalanches could become possible.

    Monitor warming and snow surface conditions while traveling in the backcountry.  When the snow becomes wet and deep, it's time to avoid steep slopes or change to more shaded aspects.  Terrain traps and downslope obstacles could have larger consequences with even a small loose wet avalanche.  

    Loose wet avalanches off of Crag Peak.

Avalanche Discussion

* Multiple natural loose wet avalanches were observed off of Crag Peak on the West Shore yesterday, all size D1.

* Recent storm snow began to change quickly yesterday due to the warming temperatures and solar radiation.  The transition to increased snow density, tree drippings, and full wet snow began in the late morning and into the midday on most all aspects.  Developing melt freeze crusts are expected on many aspects and elevations today.

* In higher elevation terrain near Luther Pass, the Feb rain crust has weakened and faceted.  This produced multiple unstable snowpack test results including 3x ECTP's.  

* Minimal wind scouring and snow transport was observed on Rubicon Peak yesterday from the Monday overnight NE winds.  SW winds increased last night into the moderate to strong range with some blowing snow possible in the most wind prone areas where snow is available for wind transport.  Winds have decreased into the morning and are forecasted to be light to moderate throughout most of the day.       

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