Very Strong Winds in the Sherwins

Mammoth Rock
Submission Info
Thursday, February 14, 2019 - 2:45pm
Red Flags: 
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
37° 36' 58.3596" N, 118° 59' 28.6404" W
Snowpit Observations
More detailed information about the snowpack: 

Went for a quick tour up above Mammoth rock this afternoon to get a look at how surface conditions are responding to the recent rain load.   The rain crust was already starting to freeze and become supportable. In some windswept areas on my decent where the blue crust was exposed getting a positive edge was challenging and a fall on steeper terrain may have resulted in a “slide for life” type of situation. In areas of deposition new snow seemed to be bonding relatively well and skiing conditions were much more enjoyable. 

Digging a quick pit in a sheltered area around 9000’ I found the rain crust to be about 15 cm thick and pencil to knife hard overlying fist hard dry storm snow from last weekend. This interface, about 30 cm from the surface, was reactive with easy force in numerous hand sheers as well my stability tests today (CTE10 and ECTP12).  

Overall there seems to have been less snow at lower elevations than was forecasted likely due to rain lasting further into the afternoon than predicted but the winds are nuclear, and they are certainly moving snow around in weird ways. Terrain features you may not normally associate with wind loading were holding new wind deposit even in sheltered areas.  I suspect wind slabs to be fairly widespread as these gale force winds continue tonight.

Snowpit videos (tests, etc): 
Weather Observations
Blowing Snow: 
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Gale Force
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
Greater than 1 in. per hour
More detailed information about the weather: 
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