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 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

LOW avalanche danger early this morning will give way to MODERATE avalanche danger at all elevations today as a loose wet avalanche problem develops in response to rapid daytime warming.

Problemi valanghivi

  • Loose Wet

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

    Above freezing air temperatures last night at the mid and upper elevations will give a head start on the development of a loose wet avalanche problem today. Rapid warming conditions are expected by mid morning. Once the surface crust has melted away, loose wet avalanches are possible. The vast majority of loose wet instability is expected on E-SE-S-SW-W aspects at all elevations. This avalanche problem may spread onto NW-N-NE aspects in isolated areas. Avalanche size is expected mostly at D1 with up to size D2 possible.

    The transition from stable to unstable surface wet snow may occur in less than 1 hour today so timing is everything. Avoid late starts for travel in sun exposed avalanche terrain. Pay attention to snow surface melt. Once the surface crust is gone, it's avalanche time. Maintain awareness for the presence of other parties either above or below you in avalanche terrain.

Avalanche Discussion

* Loose wet avalanches size D1 to D1.5 have been reported from around the forecast area on steep sun exposed slopes.

* Transitional snow surface conditions exist on E-SE-S-SW-W aspects with a thin layer of wet snow over dry snow in most areas, especially above 7,500'. In most locations, this is not a proper corn set up just yet.

* NW-N-NE aspects hold a mix of wind affected surfaces, unconsolidated snow yet to be affected by melt, and breakable crust depending on elevation and exposure to sun and past wind events.

* The existing snowpack is generally well consolidated and lacks widespread problematic weak layers. Snowpit test results indicating issues with problematic wind slabs are very isolated are this time.

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