Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
2 · Moderato
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Non aggiornato — questo bollettino è scaduto 6 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Some loose wet avalanche problems may exist today near and below treeline with MODERATE avalanche danger. Following the onset of snowfall this evening, wind slab, storm slab, and/or loose dry avalanche problems are expected to form with MODERATE to CONSIDERABLE avalanche danger expected during the overnight hours at all elevations on slopes with preexisting snow cover.

Problemi valanghivi

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    1

    Cloud cover thinned enough last night that at least a weak snow surface refreeze from radiational cooling is expected to have occurred overnight on open slopes despite above freezing air temperatures at low to mid elevations. Snow surface refreeze under forest canopy may not have occurred in some areas. The strongest refreeze is expected to have occurred above 8,000'. Maximum daytime air temperatures will be a bit colder today than what has occurred over the past few days, but still above freezing. Some snow surface melt is expected to occur today on mid to lower elevation slopes with direct sun exposure and protection from the strong SW winds. A loose wet avalanche problem is possible in these specific areas near and below treeline on E-SE-S-SW-W aspects, especially where overnight refreeze was poor. Wind exposed slopes, especially above 8,000' to 8,500' will likely remain frozen all day due to convective cooling of the snow surface. Exercise caution on or below any steep slopes that have wet surface snow and marginal to poor supportability.

Avalanche Discussion

* SE-S-SW aspects hold the most consolidated and well established melt-freeze snowpack conditions.

* NW-N-NE aspects remain highly variable, ranging from firm to soft with surface conditions ranging from ice to surface facets.

The avalanche problems will change dramatically tonight as new snow accumulates. Expect discussion of wind slab, storm slab, and/or loose dry avalanche problems in tomorrow's avalanche forecast.

Regioni coperte