Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
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Peligro de aludes

Fri
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
Desactualizado: este boletín caducó 8 months ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Anticipate wet snow avalanches today due to rain on snow across nearly all terrain over the past 24 hours. Above today's rain/snow line, slab avalanches could occur in areas where wind drifted snow is filling in along slopes on the downwind side of ridgetops and into gully features. Move cautiously around avalanche terrain in places where wet snow exists or in locations where wind drifted snow is depositing. 

Problemas de aludes

  • Loose Wet

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

    Wet loose snow avalanches could be triggered today by backcountry travelers. Move cautiously around avalanche terrain in places where wet snow roller balls are easily triggered. Wet snow avalanches may occur either below or above the rain/snow line today.

    Warming and rain on snow has created conditions conducive to wet loose avalanches. Cloud cover and above freezing air temperatures on Tuesday night followed by rain to 10,000' yesterday and last night wetted the snow surface on all aspects. Snow levels have lowered this morning, but the wet snow has not yet had a chance to refreeze, keeping this avalanche problem a widespread concern. 

    (12/31/2025)

    Roller balls are a sign of potential wet snow instability. NE aspect terrain near 8,100'. Andesite Peak, Donner Summit area, CA

    Photo: Sierra Avalanche Center

  • Wind Slabs

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

    Above the rain/snow line, identify areas where wind drifted snow is filling in to create wind slabs. Uses clues such as visible blowing snow, cornice formations, wind pillows, and snow surface cracking to identify the most likely locations of concern. Move around these suspect slopes with caution.

    Snow levels lowered early this morning, enough to create some concern for new wind slabs to form today above about 8,000'. The size of the wind slabs that form today are expected to remain small for the most part. If new snow amounts in wind protected areas manage to approach 6 inches today, larger, more problematic wind slabs will exist in wind loaded areas. 

    (12/27/2025)

    This avalanche occurred along the down wind side of this ridge feature, similar to the type of terrain where wind slab avalanches may occur today. Steven's Peak approach, Carson Pass area, CA

    Photo: Public

Avalanche Discussion

Deep, open holes, open creeks, and ponded water persist around the forecast area. These holes and open areas are especially prominent below 8,000', but have been observed at higher elevations. More rain yesterday and today will keep these terrain traps open.

Regiones cubiertas