Avalanche forecast

Central Sierra Nevada

Sierra Avalanche Center
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Avalanche danger

Sat
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
2 · Moderate
Out of date — this forecast expired 5 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Sluffs of wet loose snow may become possible on steep sunny slopes as today's sunny warm weather melts through last night's refrozen crusts and exposes the wet snow underneath them. The avalanche danger will be LOW this morning while the snow remains frozen and increase to MODERATE as soon as enough wet snow forms.

Avalanche problems

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2

    The snowpack continues to go through a cycle of melting during the day and partially refreezing during the night. How fast the snow becomes deep, wet, and unsupportable depends on how fast the overnight refreeze melts. Last night's refreeze should have been decent, but strong sunshine, slightly warmer temperatures, and less wind today should still cause the refrozen crust to melt and turn into wet snow. Once it melts it will also expose the unfrozen wet snow below it resulting in a deep layer of unsupportable wet snow. People recreating on steep slopes could cause this wet loose snow to start sliding downhill. These sluffs of wet loose snow would start small but could grow larger as they move downhill and gather more snow. Some wet loose avalanches could entrain enough snow to pose a threat to backcountry travelers especially on long steep slopes or in areas with terrain traps where small avalanches can have bigger consequences

    Timing your day to go up and down before the wet snow forms and changing aspects to chase the supportable snow before the refreeze melts represents one strategy to avoid potential wet loose avalanches. Once deep wet snow exists, travel on lower-angle terrain without steep slopes above is another way to minimize exposure to wet loose avalanches. Either way, watch for signs of wet snow instabilities like rollerballs, small sluffs of wet snow, or areas of unsupportable wet snow. Be willing to adjust your plans as conditions change.  

Avalanche Discussion

* Spring melt-freeze conditions are well established on most E-SE-S-SW-W aspects at all elevations. Thick melt-freeze crusts and firm surfaces have been reported in the mornings. Observers have seen these crusts melt around mid-morning to mid-day leaving areas of deep wet slushy snow on these aspects for the afternoon.

* NW-N-NE aspects still remain in between winter-like snow and spring melt-freeze conditions with a surface crust over colder dryer snow in some places, especially at higher elevations.

Regions covered