Bollettino valanghe

Central Sierra Nevada

Sierra Avalanche Center
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Pericolo valanghe

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

In sintesi

MODERATE avalanche danger exists in near and above treeline terrain due to a wind slab avalanche problem. LOW danger exists in below treeline areas. Human-triggered avalanches remain possible today.

Problemi valanghivi

  • Wind Slabs

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

    Wind slabs remain prevalent on wind-loaded NW-N-NE-E-SE aspects in near and above treeline terrain. Over time these wind slabs should bond to the snow below them and become more difficult to trigger, but human-triggered wind slab avalanches still remain possible today. Settlement and consolidation may happen more slowly than normal due to the continued cold temperatures. Wind slab failures could still produce large avalanches. Many slopes where wind slabs exist also have large fragile cornices resting above them. These could break far from the apparent edge of a ridge. 

    Maintain awareness of the conditions and terrain to identify where wind slabs may exist. Cornices above a slope, wind drifts/pillows, ripples on the snow surface, and other wind created textures can offer clues to help locate wind-loaded slopes. Less wind-exposed and/or lower angle terrain should hold softer less variable snow as well as safer avalanche conditions.

Avalanche Discussion

* Observations yesterday from wind-exposed areas on Jakes Peak, Rubicon Peak, and Tamarack Peak found some signs of continued wind slab instability. On Jakes, some minor cracking occurred in wind-loaded areas near the summit, but ski cuts on wind-loaded test slopes did not cause any failures. On Tamarack Peak, longer skier-triggered shooting cracks (up to 20 ft) occurred on some test slopes. Cornices failed easily in this area. Again ski cuts did not cause any wind slab failures on test slopes. On Rubicon, some snowpit tests indicated instability in wind-exposed areas near the summit. 

* In sheltered near and below treeline terrain off of Spooner Summit, on Jakes Peak, on Rubicon Peak, and on Tamarack Peak yesterday, observers reported no signs of instability and data showed deep storm snow starting to settle and consolidate.

Regioni coperte