Avalanche forecast

Central Sierra Nevada

Sierra Avalanche Center
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Avalanche danger

Thu
Alpine
1 · Low
Treeline
1 · Low
Below
1 · Low
Out of date — this forecast expired 6 months ago. You’re viewing past conditions, not the current bulletin.

Highlights

Strong winds and afternoon cloud cover are expected to limit the overall amount of surface wet snow formation today. Isolated areas of surface wet snow may form on slopes with both sun exposure and wind protection, mainly at the low to mid elevations. If you encounter more than a couple of inches of surface wet snow, or if the snow surface feels like it is becoming unsupportable, consider opting for slopes that are not steep enough to avalanche.

Avalanche problems

  • Loose Wet

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely
    Size
    1–1.5

    Limited amounts of surface wet snow are expected to form by late morning in isolated areas. Slopes that have both direct sun exposure and wind protection, especially at low to mid elevations, are expected to experience the most snow surface melt today. With strong SW winds and afternoon cloud cover in the forecast, many slopes are expected to remain frozen all day. If you encounter more than a couple of inches of surface wet snow, or if the snow surface feels like it is becoming unsupportable, consider opting for slopes that are not steep enough to avalanche.

    Snow surface refreeze conditions last night were best above about 8,000', where air temperatures were below freezing. Skies were clear last night up until about 2 am, which should have allowed for a weaker, superficial snow surface refreeze to occur on open slopes across E-S-W aspects in the areas that remained above freezing last night. Very little refreeze is expected to have occurred under areas of thick forest canopy in the locations where air temperatures remained above freezing last night. Little to no snow surface melt occurred yesterday across shaded or steeper NW-N-NE aspects, so those areas are likely still quite firm this morning at all elevations.

    A limited window of snow surface melt is expected today as morning cloud cover moves out and sunny skies occur before the next, thicker wave of cloud cover moves in for this afternoon. Avalanches of wet, loose snow are unlikely today on a regional scale.  An isolated area of instability might occur in an area of deeper wet snow where the right set of conditions comes together in terms of sun exposure, wind protection, avalanche terrain, and a backcountry traveler as the trigger.

Avalanche Discussion

The recent rain and warm weather have melted a significant amount of snow on all aspects below 7,500' and on southerly aspects at all elevations. Some locations now exhibit large swaths of bare ground. In areas with more snow cover, deep open holes, open creeks, and ponded water exist in low-lying areas, especially below 8,000'.

Regions covered