Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
Desactualizado: este boletín caducó last year. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Unstable, wet loose snow will form quickly on many slopes as the day warms up. The sun and warm weather will also weaken overhanging snow (cornices) along ridges. You can reduce your exposure to these avalanche problems by exiting avalanche terrain and moving to lower-angle slopes once the snow feels wet and staying away from areas with overhanging snow.

Problemas de aludes

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    Wet loose avalanches will quickly become possible as soon as the strong March sun and warm temperatures melt through any thin crusts that may have formed last night. Wet snow will form on slopes that get morning sun first, then progress to other slopes as the sun moves across the sky. Due to the high sun angles and warm temperatures, wet snow could exist on any aspect and at any elevation. Wet loose avalanches could easily entrain enough snow to knock a person over or push them into a terrain trap that magnifies the consequences of an avalanche. On long, steep slopes, wet loose avalanches gather more snow as they slide downhill, and some could grow large enough to bury or injure a person.

    If a window for supportable snow exists today, it will be short. Snow conditions will get wet and mushy very quickly today. Sinking into boot-top deep wet snow, roller balls, and pinwheels can indicate larger, wet loose avalanches may soon occur. Once the snow feels wet and unsupportable, it's time to move away from avalanche terrain onto less steep slopes.

    (3/23/2025)

    These skier-triggered wet loose avalanches occurred on the Fireplug in the Mt. Rose backcountry. While small, they still entrained enough snow to knock one of the skiers off his feet and carry him downslope for about 50 ft. 

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    Large overhanging cornices still exist along many ridgelines. Another night of above-freezing temperatures and more sunny, warm weather means cornice failures will be possible today. Falling cornices will become more possible each day that temperatures remain above freezing. Significant uncertainty exists about exactly when specific cornices will fail. If a person does trigger a cornice failure, they could take a long fall and/or get crushed by large cornice pieces. 

    Cornice collapses almost always surprise people by breaking farther back from the edge and/or wider than expected. If your route takes you along a corniced ridge, keep exposed rocks or trees between you and the cornice edge. Also, be wary of traveling on slopes under cornices. It's best to avoid these slopes, but if you have to travel on them, spend as little time as possible doing so.

    (3/22/2025)

    Large overhanging cornices exist along many of the ridgelines. This one is in the Donner Summit area. Warm, sunny weather will weaken this overhanging snow.

    Photo: Sierra Avalanche Center

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