Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

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

In sintesi

Cold windy weather and limited new snow this afternoon should keep avalanche activity unlikely today. As more snow and wind impact the region tonight and tomorrow, the avalanche danger will increase dramatically. Today, icy slopes, breakable crusts, and generally challenging snow conditions will present other hazards for people like long sliding uncontrollable falls. Travel cautiously in the backcountry.

Problemi valanghivi

  • Cornices

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

    Observations this week have shown a trend of increasing strength in the snowpack. As the snowpack has gained strength, recreation conditions have also deteriorated. The strong April sun has left firm icy surfaces on many exposed slopes. In some more sheltered places, breakable crusts exist. Traveling on slopes safely in these firm and challenging conditions requires proper equipment and skills. While sliding snow may be unlikely, long, out-of-control, sliding falls are not. Very low angle slopes or flat meadows can prevent falls from gaining momentum and may provide decent recreation opportunities. 

    As new snow starts to cover these icy surfaces this afternoon expect "dust on crust" conditions to form on some slopes. The avalanche danger will also start to increase. Wind slabs and storm slabs will start to form and continue to grow in size and extent tonight and tomorrow. By tomorrow expect avalanche activity on steep slopes at all elevations.

Avalanche Discussion

Yesterday widespread firm icy conditions existed on exposed slopes in the Carson Pass, Donner Summit, and Yuba Pass areas. In some more sheltered places, variable breakable crusts existed on some northerly aspects. By mid-day lower angle sun-exposed E and SE facing slopes did soften a bit. Other slopes remained firm.

Snowpit data from areas on Lincoln Ridge showed significant improvement over data gathered in the same area on 3/31. While the buried surface hoar was there, it was no longer reactive.

Snowmobilers reported recent cornice failures on Basin Peak. 

Regioni coperte