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 continues today at all elevations due to an ongoing loose wet avalanche problem. Unstable surface wet snow is expected all day today due to poor overnight refreeze and warm air temperatures.

Problemi valanghivi

  • Loose Wet

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

    A loose wet avalanche problem exists right from the start today as last night's snow surface refreeze is expected to have been weak to nonexistent. Air temperatures were above freezing last night at all locations below 9,000'. Cloud cover will have limited any snow surface refreeze from radiational cooling. A warm mostly cloudy day today with a chance of rain to 9,500' this afternoon will keep conditions prime for loose wet avalanches on all aspects at all elevations. Avalanche size is expected at D1 to D2.

    Don't expect to use aspect to avoid surface wet snow instability today. This makes slope angle the go to strategy for reducing loose wet avalanche hazard. When the snow surface is marginally supportable to unsupportable with rollerballs and pinwheels present, make the move to lower angle terrain. Pre plan routes that give options for choice of slope angle so that you have the ability to reduce avalanche hazard.

Avalanche Discussion

* Observations made yesterday on Stevens Peak (Carson Pass area) noted loose wet avalanche activity of size D1 on a variety of aspects in the area at all elevations. Little to no snow surface refreeze had occurred the night before in areas below about 8,500'. A weak refreeze on top of several inches of weak wet snow existed above 8,500'.

* Debris from a size D2 loose wet avalanche were noted on a SE aspect in the Emerald Bay Chutes early yesterday afternoon. The avalanche is believed to have occurred sometime mid to late morning yesterday. Trigger type is unknown. No report was received.

* Observations targeting wind slabs yesterday on Stevens Peak revealed no evidence of ongoing instability for this avalanche problem. No wind slab avalanches were reported in the past 24 hours.

Regioni coperte