Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 11 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

The avalanche danger will remain LOW for all elevations and aspects today. LOW avalanche danger means that while avalanche activity may be unlikely, it is not impossible. Unstable snow in the form of small isolated persistent slabs could still exist on isolated terrain features especially in complex or extreme terrain or on pockets of sheltered NW-N-NE aspects. The avalanche danger will increase tonight and tomorrow as another winter storm impacts the region.

Problemi valanghivi

  • Deep Persistent Slabs

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

    Human triggered avalanches are unlikley today. Recent observations have shown a strengthening snowpack across the forecast area. The warmer temperatures and deeper snowpack have also allowed many of the old persistent weak layers to heal and most of them no longer represent a problem. However, some variability and uncertainty still surrounds the persistent weak layer just below the 12/13 rain crust about 1 ft. below the surface of the snowpack. Most tests on this layer have indicated that it has gone dormant; however, a few tests still show unstable results on this layer. Any instabilities involving this layer will remain isolated, small,  and hard to find today, but they are not impossible. If the right trigger found the right spot on one of these isolated slopes where this layer exists, a human triggered persistent slab avalanche would not be impossible today. Large triggers like multiple people on a slope or large cornice failures would have better chances of triggering an unlikely but not impossible persistent slab.

    Other than this uncertain, unlikely, and isolated potential problem, some other small areas of unstable snow may still linger on isolated terrain features in complex or extreme terrain. Continue to use normal caution when traveling in the backcountry.  

Avalanche Discussion

Yesterday cloud cover and warming temperatures allowed wet snow to form on all aspects at lower elevations on Jakes's Peak and on Talking Mountain. At higher elevations on these peaks and on Incline Lake Peak, heavy wet snow existed on all but the north aspects by yesterady afternoon. Observations from these areas mostly showed a trend of settlement and consolidation in the snowpack, but some variablity existed in snowpit test results on Jake's Peak and Talking Mountian. Most tests indicated a strengthening trend, but some of the tests still indicated that fractures might propagate along a weak layer just below the 12/13 rain crust in some isolated areas. Some surface hoar had formed on the lower slopes of Talking Mountain closer to Echo Lake. Observers did not report surface hoar on Jake's or Incline Lake Peak. 

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