Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
Vedi sulla mappa

Pericolo valanghe

Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Open full map
Non aggiornato — questo bollettino è scaduto 10 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

Considerable avalanche danger exists on NW-N-NE-E-SE aspects near and above treeline on slopes steeper than 35 degrees due to newly formed wind slabs.  Moderate avalanche danger exists on all other aspects and elevations.  New snow, gale force winds and continuing winds throughout the day will make wind slabs grow larger and be sensitive to triggering.  Natural avalanches are possible with human triggered avalanches likely today.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2

    6-10'' of new snow with gale force winds overnight have created wind slabs on NW-N-NE-E-SE aspects near and above treeline.  With new snow available for wind transport these wind slabs will continue to grow with strong to gale force SW winds that will switch to the W and then to the NW into the afternoon hours.  These wind slabs have the potential to be over 2' deep in the most wind prone locations and will remain sensitive to triggering throughout the day.  Natural avalanches remain possible and human triggered avalanches are likely.

    Identify and avoid steep wind loaded terrain where wind slabs exists.  Look for signs of recent avalanche activity, blowing snow, wind pillows, cornices, and human triggered snow surface cracking. Avoid slopes steeper than 35 degrees where signs of wind slabs are present.  

Avalanche Discussion

Observations yesterday from Tamarack Peak (Mt. Rose area) showed 2-4'' of new snow with strong winds.  This new snow was being transported throughout the day and creating small wind slabs on leeward slopes.  With the limited new snow, wind transport amounts were small and most windward slopes were scoured down to old snow surface crusts by mid day.  Snowpack tests and informal observations showed that these wind slabs were bonding well and were not reactive throughout the day.

Regioni coperte