Convict Area: Loose Wet Activity, Persistent Weak Layers

 
 
 
 
 
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SNOWPACK OBSERVATION
Trees North of the Hippy Chutes
Submission Info
Forecaster
Sunday, March 11, 2018 - 1:00pm
Red Flags: 
Rapid warming
37° 33' 59.04" N, 118° 50' 13.92" W
Snowpit Observations
More detailed information about the snowpack: 

Toured up the Little Morrison moraine above Convict Lake to the trees just N of Hippy Chutes to look for loose wet avalanches on the E and SE aspects of Morrison and Little Morrison and to dig for the persistent weak layer in the NW trees near Hippy Chutes.

Between noon and 1pm saw 3 D1 and 1 D1.5 loose wet point releases from steep rocky terrain on E and SE aspects of Little Morrison and Morrison (see photo). Many rollerballs, but those were the only actual slides. Weather at noon when I saw the first few go was taken at 9167' on the top of the moraine E of Little Morrison: snow depth = 35cm, ski pen = 1cm, foot pen = 25cm, surface snow = Trace amnt of new precip from last night on melt-freeze crust, Tair  = 8 deg C, Tsurf = 0 deg C, T-20 = -0.5 deg C, sky = few clouds, wind = calm.

Dug a snow pit at 10,000' on a NW aspect in a large opening in the trees N of Hippy Chutes to test the persistent weak layers (see profile). CTM SCs down 60cm in depth hoar and 2 ECTPs in the same layer released with high energy. 5mm surface hoar at the surface on NW aspects above 9500'.

Snowpit or crown profile photo or graph: 
Snowpack photos: 
5mm Surface Hoar on NW aspects above 9500'
Coverage in Old Man's Bowl
Coverage is Thin
A Few D1-D1.5 Loose Wet Avalanches
Weather Observations
Blowing Snow: 
Air temperature: 
Wind Speed: 
Precipitation: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

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