Red Cone Approach Slabs

Red Cone Approach Slabs
Submission Info
Friday, January 6, 2017 - 3:30pm
Red Flags: 
Recent loading by new snow, wind, or rain
Obvious avalanche path
Red Cone Approach Slabs 37° 35' 56.832" N, 119° 1' 10.164" W
Snowpit Observations
More detailed information about the snowpack: 

Observer: doug lewis, Eastern Sierra Avalanche Center,  Jan 6, 2017, 9:07 PM
Red Cone Approach 
Lat/Lon:37.5991, -119.0195
Sierras , CA
Elevation: 9700 f
Aspect: E Angle: 33°
Signs of Instability: Wind Loading
Sky Cover: -BKN
Precipitation: No Precipitation
Wind Speed: Light, subjective
Wind Direction: W
Current Temp:-5°C Trend:➘
Blowing Snow: Light W
Snow Depth: 290cm
Snow Temperature 20cm:-6.5° C 
Boot Penetration: 30cm

Comments: Consistent 4" to 6" soft 4F facets over 4F+ > 1F from TH to Ridgetop where sheltered. Extensive settlement cracks around trees from Twin Lakes to Lake above 9,500'. Wind scouring from Southerly winds from Lake Mary (8975') to Ridgetop on Southerly aspects and open trees. No crowns or avalanches noted. 5 Stability Tests: CT11 Q2 55cm 2-3mm Surface Hoar CT11 Q3 10cm CT16 Q3 55cm Old/New interface CT4 Q2 108cm Failed under light wind crust at surface CT14 Q3 10cm Failed on facets above Dec 5 Melt/ Freeze Crust Temperature Profile: 5 points, Measured bottom up Depth: 120 cm Temperature: -5.0° C Depth: 110 cm Temperature: -8.5° C Depth: 100 cm Temperature: -7.5° C Depth: 90 cm Temperature: -6.5° C Depth: 80 cm Temperature: -5.0° C 4. Compression Tests hint a a couple of weaknesses noted prior to the storm. Surface Hoar was observed throughout much of Mammoth Basin up to 10,000'. Pre-frontal winds likely fragmented much of the observed Surface Hoar but very sheltered areas may have provided enough protection for isolated pockets. Early season facet / crust combinations, which formed in October and the first week of December continue to be observed in areas where little of now avalanche activity has been observed or reported. Possible concern with additional large loads. Good skiing throughout but likely to change with wet snow forecasted for Saturday.   

Snowpit or crown profile photo or graph: 
Snowpack photos: 
Weather Observations
Blowing Snow: 
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: 

Light to Moderate winds along Twin Lakes. Easing as you moved deeper into the trees until Lake Mary and above where recent Southerly winds were lightly scoured Southerly aspects. 

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