NE Face of Black Mtn.

SNOWPACK OBSERVATION
Submission Info
Forecaster
Wednesday, December 27, 2017 - 12:00pm
Red Flags: 
38° 2' 35.52" N, 119° 16' 7.32" W
Snowpit Observations
More detailed information about the snowpack: 

Toured up the NE face of Black Mtn. to 10,500' looking for any new wind transport and sensitivity of old wind slabs. Winds were light from the SW with moderate gusts throughout the tour. Only very localized and occasional blowing snow across sub-ridges and rollovers. None observed at ridgetops or across slopes. Kick tests showed only localized cracking (>1m) in 15 to 40cm deep old wind slabs. Hand shears pulled with hard force about 15cm down under a 1F hard wind crust on top of F hard facets. Snow depth ranged from 30cm to 110cm where wind had drifted previously. Almost all snow surfaces were wind affected (see photo). Profile dug at 10,300' on an ENE aspect revealed wind deposits sandwiched between faceted layers. Melt-freeze crusts from 12/03 and 11/27 are still present with facets in between. Where the snowpack is shallower these crusts are decomposing into facets, but where they have been covered deeply by wind on shady aspects they remain K hard crusts. Column tests showed moderate potential for fracture initiation, but did not show conditions favorable to fracture propagation (see attached profile). Skiing was mostly breakable wind crust with some soft surface facets near tree clumps.

Snowpit or crown profile photo or graph: 
Snowpack photos: 
Wind affected snow on Black Mtn. No blowing snow.
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
75% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Light
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
Southwest
Accumulation rate: 
None
More detailed information about the weather: 

Very little wind transport despite light to moderate SW winds all day. Only very localized creep on occasions.

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