Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
Ver en el mapa

Peligro de aludes

Mon
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

Snow that feels crusty or cold this morning will quickly become wet and loose as the day warms up.  This wet snow could slide down steep slopes and result in avalanches. The warm weather may also weaken overhanging snow (cornices) along ridges. Stay ahead of today's changing conditions by 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

    Last night, cooler temperatures and clearer skies should have allowed for a decent refreeze. Still, the refreeze won't last long under today's strong March sun and rapidly warming temperatures. Once this happens, avalanches of wet loose snow will be possible, especially on slopes that face the sun directly (E-SE-S-SW-W). While northerly aspects may experience less warming, the sun is high enough in the sky that some wet snow may also form on these slopes. Wet loose avalanches could 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, some could grow large enough to bury or injure a person since they will entrain more snow as they slide downhill.

    Snow conditions could change from crusty and cold to 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 starts feeling wet, it's time to move away from avalanche terrain onto less steep slopes.

    (3/19/2025)

    This wet loose avalanche occurred during the last warmup on Maggie's Peak near Emerald Bay. Similar wet loose avalanches are possible today.

  • Cornices

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

    Large overhanging cornices exist along many ridgelines around the forecast area. While last night's refreeze and today's east winds should help keep them in place, the strong March sun and rapid warming today will start to weaken them. Cornice failures may not be widespread, but they are not impossible today. As the warming trend continues this week, falling cornices will become more of a possibility. 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

Regiones cubiertas