Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Open full map
Non aggiornato — questo bollettino è scaduto 7 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Light snow accumulations overnight with gale force winds will create wind drifted snow in near and above treeline areas.  Active weather will continue today with high winds throughout the forecast region.  MODERATE avalanche danger will exist in near and above treeline areas due to wind slabs, with LOW avalanche danger continuing in below treeline terrain.

Problemi valanghivi

  • Wind Slabs

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

    Light amounts of additional snow overnight with gale force SW winds will form new wind slabs in near and above treeline areas.  These new wind slabs will be stacked on top of previous wind slabs that have formed over the last few days.  Wind gusts this morning have been reported over 100mph along the Sierra Crest.  These high winds could cause wind slabs to form further downslope off of ridges or in unusual locations.  Wind textured snow along with isolated wind slabs could even form in below treeline areas.

    Active wind loading is expected to continue all day with blowing snow, building cornices, and wind scouring.  Avoid steep wind loaded terrain and areas below large cornices.  Firm wind scoured crusts will be present along exposed ridges and high points and could cause travel concerns.  Improved riding conditions are expected in wind protected below treeline terrain.    

Avalanche Discussion

Observations from Silver Peak (Pole Creek area) and Andesite Peak (Donner Summit area) came in yesterday.  Active light wind loading continued through the day at both locations.  Near treeline areas were wind scoured down to firm crusts, while more wind protected below treeline areas had wind pressed snow.  Cracking was limited at both areas with the newly formed wind slabs non-reactive.

Weak faceted snow around the Jan 4 rain crust was targeted for snowpack tests on Andesite Peak.  Snowpack tests did not show these weak layers to be as problematic as has been seen at other locations in the forecast region.

Regioni coperte