Bollettino valanghe

Eastside Region

Eastern Sierra Avalanche Center
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Pericolo valanghe

Thu
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole
Non aggiornato — questo bollettino è scaduto 5 years ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

MODERATE Danger persists above treeline today while LOW danger exists near and below treeline. Be on the lookout for lingering wind slabs on all aspects today, Particularly in complex alpine terrain and in the northern half of the forecast area. Stability has been improving quickly but human-triggered avalanches may still be possible today.  Evaluate snow and terrain carefully and identify features of concern.

*Please join us for a public debrief around the high-profile avalanche accident that occurred on January 30th, 2021 in the Punta Bardini area.  This virtual event is taking place on Thursday, March 18th at 7 pm and more information can be found HERE.*

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    Our winds have shifted yet again and are expected to be predominantly out of the southwest today, however, speeds are expected to be relatively light. Some minor wind transport may be possible at upper elevations today, but substantial slab formation is not likely. Lingering wind slabs have been gaining strength, however, it may still be possible to find a consequential avalanche in the high alpine. This is particularly true on unsupported alpine slopes and in extreme terrain.  Large drifts, recent cornice growth, and uneven snow surfaces are all clues that indicate nearby wind deposits. Do your own localized assessments and be suspect of terrain features that encourage drifting such as the leeward sides of ridgelines, gully features, and cross-loaded depressions.

Avalanche Discussion

Field observations suggest avalanche conditions are stabilizing relatively quickly after our most recent storm. However, with relatively little information from the high alpine, forecaster confidence in the distribution and reactivity of recently developed wind slabs is less certain. If you find yourself in the high alpine today it will be important to conduct your own assessments and be on the lookout for areas of unstable snow.

It will also be important to pay attention to surface warming today; solar radiation may lead to a decent surface melt on solar aspects and increasing cloud cover may lead to a greenhouse effect in the afternoon. Keep an eye out for sticky wet snow, rollerballs, and pinwheels today. These are all signs that more consequential loose wet sloughing may be possible.

Recent Observations

-03/16- Lee Vining- Snowpack conditions below the Dana Plateau

-03/16- Mammoth Area- Snowpack and Weather observation from the Mammoth Crest

-03/16- Convict Area- Variable snow conditions, thin low elevation snowpack. Old Mans Bowl

-03/15- Mammoth Area- Loose-dry activity, strong winds, and increasing wind slab hazard in the Lakes Basin

-03/15- Mammoth Area- Wind Slab Avalanche, Mammoth rock bowl

-03/15- Mammoth Area- New snow, Loose-dry sloughing, Punta Bardini

-03/15- Mammoth Area- Large natural Wind slab avalanche, No Name peak

-03/15- June Lake Area- Snowpack and weather observation

-03/15- June Lake Area- Natural avalanche activity in the Negatives

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