Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Alta quota
1 · Debole
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
Open full map
Non aggiornato — questo bollettino è scaduto 8 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

LOW avalanche danger exists for all elevations. Normal caution is advised.

Problemi valanghivi

  • Cornices

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

    Recent new snow buried and preserved the Dec 4 surface hoar layer under just a few inches of new snow. Generally, the snow above the surface hoar weak layer is too shallow and lacks sufficient cohesiveness to present a problematic slab. Avalanche concerns are minimal at this time until another loading event occurs. Exercise normal caution while traveling in the backcountry to keep a margin of safety against the unexpected isolated pocket of unstable snow.

    Ridgetop winds are expected to pick up a little bit tonight from the SW. There is plenty of unconsolidated snow along the ridgetops available for wind transport. It is possible that a few small and isolated wind slabs could form tonight. This added load on top of the buried 12/4 surface hoar layer may create areas of unstable snow.

Avalanche Discussion

* The Dec 4 buried surface hoar layer has been noted within the top 6 inches of the snowpack in many but not all locations around the forecast area. It is often difficult to find when present. Grain size ranges from 4 to 15 mm (about 1/8 to 1/2 inch).

* The deeper snowpack is well consolidated and without problematic weak layers.

* No new avalanche activity has been reported since Dec 2.

* Decent snow coverage exists above 7,000' to 7,500' along the Sierra Crest with the best coverage in the northern and far southern Sierra Crest portions of the forecast area.  Snow coverage declines to the east.  Early season conditions exist.

Regioni coperte