Surface Instabilities in the Sherwins

Mammoth Rock
Submission Info
Sunday, March 10, 2019 - 1:45pm
Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
37° 36' 32.904" N, 118° 59' 31.7292" W
Snowpit Observations
More detailed information about the snowpack: 

I went for a quick tour above Mammoth rock this afternoon to the top of the Hose.  About 2” of new snow was noted at the trailhead around 11 am. Skies were partly cloudy and winds were pretty calm until I reached the ridge where steady moderate winds were blowing from the NE.  No wumphing was observed during my tour today but I observed shooting cracks up to 5 ft on a cross-loaded ridge feature and was able to trigger some small wind slabs on the ridge and a loose dry slide in the poop chute.  I also observed ample evidence of natural activity; both loose dry and wind slabs on the ridge.  Nothing observed today was over a size 1.  Skiing in the trees above 9000’ consisted of 5-7” of new low-density powder overlying more dense wind affected snow.   No signs of instability were observed today beyond the small fresh wind slabs and small loose sloughs.  All in all, it was a stellar day in the neighborhood.  

Snowpack photos: 
Snowpit videos (tests, etc): 
Weather Observations
Blowing Snow: 
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Skies were partly cloudy throughout the afternoon and winds were light below treeline.  at 10100' On the ridge at 1:30 PM the temperature was -7.5° C and winds were steady moderate out of the NE.  Only minimal snow was being transported. 


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