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

Avalanche danger remains LOW for all elevations and aspects. Small loose wet or loose dry avalanches could occur in isolated areas. Normal caution is advised.

Problemas de aludes

  • Cornices

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

    Isolated small avalanches remain possible today on all aspects on slopes 37 degrees and steeper. Avalanche character is expected to take the form of either loose wet or loose dry depending on aspect. Sun exposed areas on E-SE-S-SW-W aspects hold the greatest potential for loose wet instability in response to daytime warming. Snow from the recent storm on these aspects remains transitional in many areas and is not yet fully assimilated with the older melt-freeze snow below it. The majority of instability is expected to take the form of human triggered roller balls and pinwheels. Many areas below 7,500' on SE-S-SW aspects have melted out to bare ground since the last storm. As air temperatures continue to warm, wet surface snow will continue to form on all but the most shaded northerly aspects.

Avalanche Discussion

Observations made yesterday on Rubicon Peak (West Shore Tahoe area) indicated that recent storm snow in shaded areas on northerly aspects remains cold, unconsolidated, and has yet to undergo a melt-freeze cycle. No evidence of instability was observed in the area. Snowpit data collected near treeline at 9,000' on a NNW aspect indicated that old near crust facets and buried near surface facets are rounding and gaining strength. A new layer of near surface facets is forming at the snow surface, but is not problematic at this time. Snow coverage on NW-N-NE aspects in the area is decent to good above 8,000', but quickly becomes poor to unskiable below 7,800'. Minor amounts of surface wet snow in a transitional state from recent storm snow to melt-freeze was observed on E-SE aspects at ~9,100' at mid day. Ski cuts on several test slopes 35-40 degrees in slope angle did not create any loose wet sluffs. Looking out from Rubicon Peak towards general SE-S-SW aspects around the northern half of the Lake Tahoe Basin shows large areas of bare ground on SE-S-SW aspects below 7,500'.

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