Avalanche forecast

Central Sierra Nevada

Sierra Avalanche Center
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Avalanche danger

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Out of date — this forecast expired 5 years ago.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

Highlights

LOW avalanche danger this morning will increase to MODERATE avalanche danger as daytime warming occurs today.  Loose wet avalanches will become possible in wind protected areas in mostly below treeline terrain.  Limited loose wet instabilities are expected in wind exposed near and above treeline areas due to strong winds.  

Avalanche problems

  • Loose Wet

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

    Below freezing overnight temperatures were reported from all remote weather stations throughout the forecast area with mostly clear skies.  A very good refreeze of the snow surface is expected at all locations this morning.  Moderate to strong NE winds today along with the good overnight refreeze will limit or delay softening of the snow surface in many areas.  In wind protected mostly below treeline areas, the softening process and possibility of loose wet avalanches will just be delayed.  In wind exposed near and above treeline areas, loose wet instabilities should be limited with some snow surfaces with direct wind exposure remaining firm crusts throughout the day.  Loose wet avalanches will become possible as intense solar radiation and warming temperatures break down the surface crusts as wet snow forms. 

    Monitor snow surface warming and snow conditions while traveling in the backcountry.  If the surface snow gets deep and wet, its time to move to a different aspect or to lower angle terrain to avoid this avalanche problem.  Roller balls and pinwheels will be indications that the snow surface is rapidly warming and loosing strength.  Even small loose wet avalanches can have increased consequences when terrain traps or downhill hazards exist.      

Avalanche Discussion

* Melt freeze crusts are forming on E-SE-S-SW-W aspects throughout the forecast area at most elevations.  NW-N-NE aspects are still transitional (surface crust over recent storm snow).  Wet snow has been found on all aspects below around 7500' with some areas of unsupportable snow in heavily treed areas below 7000'.

* Limited loose wet instabilities were reported from Carson Pass yesterday with spring snow conditions throughout most of the day.    

* Limited to no snow is available for wind transport.  Wind slabs are not expected to form today even with the windy conditions.

Regions covered