Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Alta montaña
1 · Débil
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Desactualizado: este boletín caducó 11 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

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.

Problemas de aludes

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    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temperatures and deeper snowpack have also allowed many of the old persistent weak layers to heal and most of them no longer represent a problem.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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