Avalanche forecast

Eastside Region

Eastern Sierra Avalanche Center
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Avalanche danger

Mon
Alpine
1 · Low
Treeline
1 · Low
Below
1 · Low
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Highlights

LOW avalanche danger exists at all elevations.  LOW does not mean NO. Concern still exists for an unlikely but not impossible scenario where a rider could trigger a large persistent slab avalanche in steep complex terrain at all elevations. It may be possible to find an old stubborn wind slab to trigger on a steep unsupported slope as well at upper elevations.  

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Unlikely
    Size
    2–3

    Sugary faceted snow exists in many places under a robust settled slab of snow from the end of January storm.  While snow-pit test results are still concerning, the snowpack has had time to adjust and it is becoming more and more unlikely that a rider could trigger an avalanche on these buried weak layers.  None-the-less, if an avalanche was triggered it would likely be large and potentially deadly.  E-NE-N-NW slopes where continuous snow existed prior to this last storm are of greatest concern, with potential on W and SE aspects as well. The northern half of the forecast zone is where more continuous old snow existed.  Complex terrain steeper than 35°, an unsupported slope, and a shallow point of snow near rocks is where an isolated trigger point for an avalanche may exist.  What makes this a particularly tricky problem is that there aren’t warning signs, and slope cuts and stomps aren’t safe as they would likely result in the avalanche breaking above you.     

  • Wind Slabs

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

    Strong to Extreme Winds were blowing for several days up until 2 days ago from the SW and then N.  While time has passed to allow new slabs to bond, it may not be impossible to find an area where an old stubborn wind slab could be triggered.  Steep complex terrain above treeline is where you might find a firm panel of unsupported snow that could break loose under you.  

Avalanche Discussion

Sunny skies, warm temperatures and light winds will be with us again today and result in the warming of southerly facing slopes.  Rollerballs will be possible, but should remain small and fairly inconsequential.  If you do notice yourself sinking deep into the snow, it is time to find less steep, or shady terrain,

It is always a tough decision for forecasters to drop the danger rating for persistent slab problems, as a certain degree of uncertainty almost always exists, and a resulting avalanche would likely be large and consequential. While test results are becoming less concerning in some areas, they are still propagating energetically in other areas where they are likely to remain concerning for a long while. Test results are just one piece of the puzzle. It is important for you to put your own thought and analysis in deciding what terrain to ride.

RECENT OBSERVATIONS:

-2/6 – Mammoth – Punta Bardini: Warming southerlies, tests still propagating in facets on northerlies. 

-2/6 - June – Negatives: Wind effects, old avalanches.

-2/6 – Rock Creek – Witcher Creek: Thin snowpack, warming snow.

-02/5- Lee Vining Area- Wind effects in Lee Vining canyon

-02/5- June Lake Area- Snow conditions on San Joaquin Mountain

-02/5- June Lake Area- Snow conditions in the JMR backcountry

-02/5- Mammoth Area- Wind affects, weak structure in the Lakes basin

-02/5- Mammoth Area – Snow conditions and a Large natural avalanche, Hollywood bowl

-02/5- Mammoth Area- Snow pit and poor structure, Panorama dome

-02/5- Bishop Area- Recent avalanche activity and snow conditions on Mt Tom.

Regions covered