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
1 · Debole
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Non aggiornato — questo bollettino è scaduto 10 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

MODERATE avalanche danger exists in near and above treeline terrain today with LOW danger in below treeline areas. Human triggered wind slab avalanches and loose snow sluffs will remain possible today. Carefully evaluate snowpack and terrain before committing to any slopes and use this information to avoid slopes where avalanche problems may exist.

Problemi valanghivi

  • Wind Slabs

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

    Human-triggerable wind slabs will remain possible on wind-loaded slopes in near and above treeline areas. The lingering wind slabs left over from the recent storm that exist on NW-N-NE-E-SE-S aspects will represent the largest of these wind slabs. Due to shifting winds today and yesterday some smaller wind slabs may exist on other aspects near ridgelines. Large fragile cornices also still exist along many of the ridgelines.

    Use clues such as blowing snow, cornice formations, and wind pillows to help identify recently wind-loaded slopes where unstable wind slabs may exist. Then use this information to plan a backcountry travel route that avoids the potentially unstable wind-loaded slopes and utilizes more sheltered terrain where better snow for recreation will exist.

  • Wet Slabs

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

    Some loose snow sluffs that involve the cold unconsolidated snow that exists in the upper foot of the snowpack could be possible today on steep sheltered slopes. Most of these would occur where the coldest and least cohesive snow exists on NW-N-NE-E aspects. 

Avalanche Discussion

Observations on Silver Peak, Powderhouse Peak, and in the Horse Meadows/Blue Lakes area found little evidence of slab formation on near and below treeline sheltered slopes. Soft, cold, unconsolidated snow existed on the surface in in all three areas on sheltered slopes. Snowmobile cuts did produce a loose dry sluff on a steep test slope in the Horse Meadows area. In near and above treeline wind-exposed areas, wind affected snow existed in all three areas. Some slopes held scoured surfaces some held firm wind slabs and some held softer wind slabs. Cornices also existed on leeward aspects. On Powderhouse Peak, snowboard cuts did produce wind slab failures on some wind-loaded test slopes and shooting cracks on others. Ski cuts on wind-loaded test slopes on Silver Peak only produced small cracking and some sluffing in the new snow.  On Silver Peak and in the Blue Lakes area, observers noted some natural wind slab avalanches that had new snow covering the debris indicating that they likely occurred on Tuesday at the latest.

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