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
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 some lingering wind slabs. The avalanche danger is LOW below treeline. Human-triggered avalanches may remain possible today.

Problemi valanghivi

  • Wind Slabs

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

    Wind slabs should have become more difficult to trigger in most places. However, some human-triggered wind slab avalanches may remain possible on specific terrain features in near and above treeline terrain on NW-N-NE-E-SE aspects. Steep complex terrain including couloirs/gullies, cliffy areas, unsupported slopes, and areas with convex slopes represent some places where finding an unstable wind slab may be possible. Some scouring and light wind transport may have occurred from last night's E-NE winds but any wind slabs formed by these short-lived winds should remain small and isolated. Large fragile cornices that could break far from their edges also exist above many wind-loaded slopes.

    Cornices above a slope, wind drifts/pillows, ripples on the snow surface, and other wind created textures can offer clues to help identify where wind slabs may exist. Less wind-exposed and/or lower angle terrain should hold softer less variable snow.

Avalanche Discussion

* Observations from the Blue Lakes area, Centerville Peak, Flagpole Peak, Blackwood Ridge, and Shirley Canyon all showed soft cold snow with no signs of instability in sheltered locations yesterday.

* Some active blowing snow was reported near the summit of Centerville Peak during the day and along Carson Pass yesterday afternoon.

* Small wind features on Blackwood Ridge and near Centerville Peak did not show signs of instability. 

* Observers reported large "tiger striping" and other signs of previous wind-loading on more exposed slopes in the Blue Lakes area.

Regioni coperte