small amounts of new snow in the Sherwins

Mammoth Rock
Submission Info
Wednesday, April 14, 2021 - 6:45pm
Red Flags: 
37° 35' 15.0468" N, 119° 1' 49.152" W
Snowpit Observations
More detailed information about the snowpack: 

I went for a quick tour this afternoon above mammoth rock to get a look a look at new snow totals and to gauge the potential for possible wind slab instabilities.

Intermittent storms in the Mammoth area this morning provided a thin new coat of snow but even approaching 10,000’ total accumulation in sheltered areas averaged about a half-inch. This new snow was sitting on top of hard crusts in most areas although below 9000’ or so this crust had softened a bit and made for a bit more pleasant skinning and sliding experience.

Along the ridgeline, I saw some evidence of wind transport and subsequent loading was apparent along the ridgeline with drifted areas holding about 4-6” of fresh snow. I did not find any concerning wind slab development however it was quite easy to trigger small loose dry avalanches in steep terrain where these deeper deposits existed. The hard and slick interface made these sloughs quite sensitive but there was not yet enough snow to allow them to grow to a concerning size.

Overall the coverage in the Sherwins is getting pretty darn thin. Particularly near the trailhead where several dry patches required gear removal on my way back to the truck.

Snowpack photos: 
Weather Observations
Blowing Snow: 
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

intermittent snow showers, moderate to strong southwest winds, and temperatures hovering right around freezing. Accumulation around a half-inch this morning but snow showers seemed to pick up a bit in the late afternoon.

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