Avalanche forecast

Central Sierra Nevada

Sierra Avalanche Center
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Avalanche danger

Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
Out of date — this forecast expired 8 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

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.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    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.

Regions covered