Red Lake Bowl / Black Mtn

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SNOWPACK OBSERVATION
Red Lake Bowl / Black Mtn
Submission Info
Forecaster
Wednesday, December 21, 2016 - 2:30pm
Red Flags: 
Obvious avalanche path
Red Lake Bowl / Black Mtn 38° 2' 31.92" N, 119° 16' 11.64" W
Snowpit Observations
More detailed information about the snowpack: 

From THD, good snow coverage. Virginia Lake and Red Lake ~2' (65 cm) snow over ice. Light wind effect or skin over 1 Fingerish over 4 Finger with Pencil to knife below until ~ 20 cm above ground where it's possible a layer of facets formed early season (Oct. - Nov.) Strong Temperature gradient in the upper snowpack but quickly subsides below 20 cm from surface. Red Lake Bowl slid during last storm cycle. ~ 1300' wide x 800' vertical, visible crown 1-2', max 6'. Slide broke through 3' of ice! No recent slides noted. Ski conditions above treeline quasi-breakable wind skin, improving as you descend into the treeline and lower gullies.  

Observer: doug lewis, Eastern Sierra Avalanche Center
Dec 21, 2016, 2:37 PM
Red Lake Bowl
Backcountry
Lat/Lon:38.0422, -119.2699
Sierra, CA
Elevation: 10250 ft
Aspect: ENE Angle: 30°
Sky Cover: FEW
Precipitation: No Precipitation
Wind Speed: Calm, subjective
Current Temp:-1.5°C Trend:➘
Snow Depth: 256 cm
Snow Temperature 20 cm:-8.5° C 
Boot Penetration: 5 cm

Comments: Below 185 cm snow is mostly Pencil to knife. ~ 235 cm from surface possible facets to ground. Red Lake Bowl slid during last storm cycle. ~ 1300' wide x 800' vertical, visible crown 1-2', max 6'. Slide broke through 3' of ice! 4 Stability Tests: ECTN16 Q3 21 cm, failed directly under shovel, no propagation. CT13 Q3 21 cm, CT4 Q3 21 cm, CT21cm Q3 21 cm. Temperature Profile: 8 points, Measured top down Depth: 0 cm Temperature: -11.0° C Depth: 6 cm Temperature: -9.0° C Depth: 10 cm Temperature: -8.5° C Depth: 20 cm Temperature: -7.5° C Depth: 30 cm Temperature: -7.5° C Depth: 40 cm Temperature: -6.5° C Depth: 50 cm Temperature: -6.0° C Depth: 60 cm Temperature: -5.5° C 3 Snow Pit Layers, Measured top down Top Location: 0.0cm, Thickness:1.0cm, Bottom: 1.0cm Hardness:P, Grain Type:DFbk, Grain Size:0.3, Liquid Water Content:D, Top Location: 1.0cm, Thickness:19.0cm, Bottom: 20.0cm Hardness:1F, Grain Type:FC, Grain Size:0.5, Liquid Water Content:D, Top Location: 20.0cm, Thickness:50.0cm, Bottom: 70.0cm Hardness:4F/4F+, Grain Type:DF, Grain Size:1.0, Liquid Water Content:D,

 

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Calm
Precipitation: 
None
Air temperature trend: 
Cooling

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