Avalanche forecast

Central Sierra Nevada

Sierra Avalanche Center
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Avalanche danger

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Out of date — this forecast expired 8 years ago.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

Highlights

The avalanche danger will increase to MODERATE as the day warms up. Loose wet avalanche problems will become possible. 

Avalanche problems

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1

    Warm temperatures last night coupled with overnight cloud cover should have prevented a good refreeze from occurring in many areas. While today's cloud cover and slightly cooler temperatures may not melt the snow as quickly as yesterday's sunny warmer weather, today's warming should still be enough to melt through the minimal to non-existent refreeze from last night. Loose wet avalanche activity will become possible again especially on sun-exposed E-SE-S-SW-W aspects. The cloud cover could also help spread the warmth to the more northerly aspects and some loose wet instability could exist on those slopes. Wet snow instabilities could include pinwheels, rollerballs, and loose wet avalanches. Some of the loose wet avalanches could involve enough snow to injure a person.

    Wet sticky snow, boot-top-deep wet snow, active roller balls or pinwheels, and other loose wet avalanches can indicate increasing wet snow instability.  Once signs of wet snow exist, move to a colder more shaded aspect or lower angle slopes. Planning an early start and an early finish can help avoid loose wet avalanche issues. 

Avalanche Discussion

* A layer of soft wet melt-freeze snow resting on top of a supportable melt-freeze crust formed on sun-exposed aspects by 10:30-11:00 am yesterday on Chickadee Ridge by (Mt Rose backcountry), Stevens Peak (Carson Pass area), and Angora Peak (Echo Summit area).

* By noon yesterday, ski cuts on test slopes triggered pinwheels on Stevens Peak and on Chickadee Ridge.

* On the sun-exposed lower elevations of Angora (below 7000 ft), stepping into the wet snow resulted in post-holing to the ground at 8:30 in the morning. On Chickadee Ridge, boot-top to mid-shin deep wet snow existed on sun-exposed aspects by noon.  

* Several recent loose wet avalanches had occurred in the past 3 days on sun-exposed slopes in the Mt. Rose backcountry.

Regions covered