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 10 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

LOW avalanche danger exists at all elevations, but some unstable snow may still linger on isolated terrain features. Evaluate the terrain and snowpack while traveling in the backcountry to identify where these isolated areas of unstable snow may still exist. Use normal caution when traveling in the backcountry.

Problemi valanghivi

  • Cornices

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

    While triggering an avalanche remains unlikely, some unstable snow may still exist on isolated terrain features especially in steep complex or extreme terrain including couloirs, hanging snowfields, and steep cliffy areas. Large cornices still exist above many wind loaded slopes and the additional weight of a person on these cornices could still cause them to break. The warm sunny weather could make these cornices weaker and easier to trigger.

    Assess the snowpack and terrain to identify where isolated areas of instability may linger. Practice safe backcountry travel techniques like using low angle slopes or ridgelines to approach terrain and only exposing one person at a time to avalanche terrain. Regroup in safe zones out of avalanche paths or runout zones. 

Avalanche Discussion

Yesterday observations on Andesite Peak and in Negro Canyon found  a mix of snow surface conditions including soft unconsolidated snow on sheltered north aspects, wind scoured and wind packed surfaces on exposed near and above treeline slopes, wet snow and breakable sun crusts on sun-exposed E-SE-S-SW-W aspects above 7000 ft, and soft cold snow on all aspects below 7000 ft. where the air temps remained cold due to the inversion. In Negro Canyon, descending E facing test slopes triggered small roller balls and pinwheels and east facing cornices had water dripping off of them. Observations did not reveal any other signs of instability other than this wet surface snow. Surface hoar existed on open shaded slopes in both areas. 

Regioni coperte