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Out of date — this forecast expired 12 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

MODERATE danger will form on all aspects at all elevations on slopes 37 degrees and steeper as daytime warming and sunshine melt through the overnight refreeze holding the snowpack together. Human triggered loose wet avalanches will become possible. Natural avalanches remain unlikely.

Avalanche problems

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1

    Last night's scattered cloud cover should have prevented a strong refreeze in some areas even though temperatures did remain slightly cooler. In areas where the clouds cleared a stronger overnight refreeze should have occurred. In either case, today's strong sunshine and warm temperatures should still melt through the refreeze. The areas with a weak refreeze will become unsupportable sooner, and those with the stronger refreeze will last a little longer. Once the refreeze melts, enough unconsolidated wet snow will exist for human triggered loose wet avalanches including pinwheels, roller balls, and loose wet snow point release avalanches to become possible on all aspects at all elevations. Most of these loose wet snow instabilities should remain small and not entrain much snow.

    Getting out early and leaving the slopes before last night's refreeze completely melts represents a good way to avoid dealing with unsupportable, wet, sticky snow. Once the refreeze does melt the recreation conditions deteriorate and the hazards increase. At that point finding a different afternoon activity that does not involve steep snow covered slopes is a great idea.

Avalanche Discussion

Yesterday on Castle Peak, the refreeze lasted a little longer than on previous days and provided a slightly longer window when the snowpack remained supportable. The sun and warm spring weather did melt through the refreeze by about 12:30, leaving boot-top deep wet snow behind on the E-SE-S-SW aspects. The northerly aspects that held firm frozen surface crusts in the morning stayed supportable for a little while longer. Large areas of bare ground have melted out along the west ridge and on the SE-S-SW aspects.

Regions covered