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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In sintesi

For the daylight hours today, LOW avalanche danger continues for all elevations. Depending on new snowfall amounts, areas of MODERATE avalanche danger may form tonight. A wind slab avalanche problem is expected to develop as winds increase today and new snowfall arrives this evening.

Problemi valanghivi

  • Wind Slabs

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

    As SW ridgetop winds increase to gale force today, any snow still available for wind transport will allow for small wind slab formation in near and above treeline areas on NW-N-NE-E-SE aspects. Following the onset of snowfall this afternoon/evening, wind slabs will have a better opportunity to increase in size, especially if the upper end of forecast snowfall amounts are reached. Isolated wind slabs capable of size D1 avalanches today could develop into location specific or widespread wind slabs capable of size D2 avalanches during the overnight hours depending on snowfall amounts.

Avalanche Discussion

-Areas with a usable snowpack are generally limited to locations above 8,000', but extend down to 7,300' in isolated areas.

-High density rain crust exists near and sometimes at the snow surface in most locations below 10,000'.

-Melt-freeze surface conditions exist on southerly aspects and cold dry faceted surface snow can be found on northerly aspects and in other shaded areas.

-Surface hoar up to 10 mm in crystal size has been noted in the Carson Pass and Donner Summit areas.

-The layers deeper in the snowpack are well bonded and previously affected by rain and melt.

Regioni coperte