Boletín de aludes

Central Sierra Nevada

Sierra Avalanche Center
Ver en el mapa

Peligro de aludes

Sun
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
Open full map
Desactualizado: este boletín caducó 5 years ago. Estás viendo condiciones pasadas, no el boletín vigente.

Lo esencial

Shifting winds will pile blowing snow up in new places today. People could trigger avalanches on slopes where wind-blown snow accumulates especially in open areas near ridges. Watch out for slopes with blowing snow, cornices, and/or rippled snow surfaces.

Problemas de aludes

  • Wind Slabs

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

    The winds shifted to the N and NE during the night and should be strong enough to move snow at times. These winds typically scour snow away from the N-NE-E aspects and blow it over to the SE-S-SW-W-NW aspects. Most of today's wind slabs will exist on open slopes near ridgelines on those newly wind-loaded aspects. A few old wind slabs may still linger on the N-NE-E aspects in areas with less wind scouring. Many of the wind slabs should remain small and not extend too far from the ridgelines. However, some could involve enough snow to bury or injure a person especially if an avalanche occurs in an area with terrain traps like gullies or cliffs. Triggering a wind slab avalanche will remain possible today. Large cornices still loom above many slopes.   

    Blowing snow, cornices, and wind-affected snow surfaces can all help identify where wind slabs may exist. Traveling in terrain sheltered from the winds can provide a way to bypass the wind slabs and wind-affected snow. The sheltered terrain also offers a better chance for finding softer, more consistent snow. 

Avalanche Discussion

* People reported more recent wind slab avalanches on open slopes where wind-blown snow accumulated around the forecast area yesterday. Many of these occurred on 12/29 and 12/30. All of the avalanches reported were D1 to D2 in size, with some crown lines up to 1 foot deep. At least one new skier-triggered, small (D1)  wind slab avalanche occurred yesterday (12/31) on a small lower elevation slope.

* Wind-affected snow and drifts extend well into sheltered areas and down onto lower elevation slopes. 

* Cornices have been pulling away from ridges and creating large deep fissures behind the cornices in several places around the region.

* Surface hoar was reported on many slopes yesterday. 

* Snowpack depths above 7000' are in the 10 to 16 + foot range.

Regiones cubiertas