Cooney Lake Trees, Persistent weakness, Solar effect

Black Mtn, Cooney Lake Trees
Submission Info
Thursday, February 1, 2018 - 3:00pm
Red Flags: 
Black Mtn, Cooney Lake Trees 38° 2' 51.36" N, 119° 16' 28.2" W
Snowpit Observations
More detailed information about the snowpack: 

Observer: d lewis
Date: Feb 1, 2018, 3:36 PM
Lat/Lon:38.0476, -119.2745
Elevation: 10250 f
Aspect: NW Angle: 20°
Sky Cover: -FEW
Wind Speed: Calmsubjective
Current Temp: 3.5°C
Snow Temperature 20cm:-4° C 
Boot Penetration: 15cm

Comments: Toured up into upper Virginia Lakes (Cooney Lake) to assess general snowpack warming, possible recent avalanches, and persistent weaknesses. No visible wind loading, avalanches, or rollerballing. Snow depth varies widely depending on terrain features and aspect. Southerly aspects rely more on terrain features to capture snow, Northerly aspects favor a combination of terrain capture , sheltered aspects, and limited temperature swings. Persistent weakness still lurking and somewhat more reactive. Upper suspended slabs could fail and step down in the right circumstances. 7 Stability Tests: CT21 Q2 63cm Weak Q2 CT25 Q2 63cm Weak Q2 CT16 Q2 93cm Failed simultaneously at 63cm on well developed facets. Potential for step down. CT15 Q2 93cm ECTN23 Q2 63cm ECTN15 Q2 93cm CT11 Q2 93cm No recent visble snow transport, rollerballing, or avalanches. Open water along much of the creek leading to Cooney Lake.

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
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