Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 3 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Recently created slabs of wind drifted snow along with rapid warming will keep avalanche concerns ongoing today. Identify areas where wind drifted snow was deposited during the last storm and consider avoiding those slopes. Steeper sun exposed slopes could become increasingly unstable as daytime warming progresses requiring a travel plan that anticipates changing conditions.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1.5–2.5

    Gale force SW winds came to an end last night and will switch to mostly light NE for today. The SW winds from the past several days drifted recent snowfall into cohesive wind slabs. In some places, the wind slabs have been difficult to trigger while in other places easy to trigger. This has even been observed on adjacent slopes. Wind slabs for today are most widespread above treeline and near treeline across NW-N-NE-E-SE aspects. Wind slabs exist to a lesser extent below treeline due to the strength of the recent SW winds.

    Rapid warming on sun exposed wind slabs may contribute to instability today. Identify the areas where wind slabs exist and consider avoiding them. Use clues such as cornice features and wind pillows near ridgetops and gully edges as well as snow surface texture to determine the slopes where concerning areas of wind drifted snow exists.

     

    (3/14/2023)

    A shallow but fairly wide propagating wind slab avalanche, intentionally skier triggered in near treeline terrain. Hidden Peak, West Shore Tahoe area, CA

    Photo: SAC

  • Loose Wet

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

    It's now the middle of March and as the sun comes out today substantial amounts of incoming solar radiation will occur. This is expected to lead to some wet loose avalanches occurring on sun exposed avalanche terrain. As daytime warming progresses sun exposed slopes are expected to become increasingly unstable.

    Becoming caught in even a small wet loose avalanche can have substantial consequences. Any place where wet loose avalanches have a long open slope to run on will allow for increased avalanche size to occur as more snow is entrained. Anticipate the expected change in stability today on sun exposed slopes as daytime warming progresses and plan travel with the specific intent to manage all of today's avalanche concerns.

     

    (3/14/2023)

    A small wet loose avalanche intentionally skier triggered on a steeper micro terrain feature in below treeline terrain. Hidden Peak, West Shore Tahoe area, CA

    Photo: SAC

Avalanche Discussion

  • Wind slab and wet loose avalanches were observed yesterday.
  • Rain was observed up to 7,500' to 8,000' yesterday.
  • Poor visibility and stormy conditions have limited observations of larger terrain for several days. Many larger slopes likely avalanched in recent days.
  • A storm slab avalanche problem in wind protected areas is unlikely today on a regional scale due to the warm to cold snowfall at the end of the storm and minimal additional snowfall in the past 12 hours. That said, don't let your guard down entirely for this avalanche problem as encountering isolated storm slab instability is not impossible.

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