Mt Gibbs - N. Facing Chute

SNOWPACK OBSERVATION
Mt Gibbs - N Facing Chute
Submission Info
Forecaster
Wednesday, December 14, 2016 - 12:15pm
37° 53' 45.6216" N, 119° 11' 4.0236" W
Snowpit Observations
More detailed information about the snowpack: 

-Dirt Rd clear to Gibbs Lake TH parking (locked gate).  20 minutes of walking on summer trail until enough coverage to skin.  6-12" of dense consolidated snow to Gibbs lake (very supportable with most obstacles visible), very variable with some areas of icy glaze (adventurous skiing back down following summer trail).  1-4ft+ of snow from Gibbs Lake up middle N. facing couloir.  Couloir quite well filled from windblown snow from the various storms.  (see attached pic of approach)

-Pit dug at 9900' just below mouth of couloir, see attached profile and picture.  60cm deep snowpack, slightly moist throughout at noon (air temp was 0deg C).  2 CT tests produced no results, while one failed just above ground with hard force, very rough Q3 fracture.  

-Multiple had pits and one test pit dug in various locations in couloir testing upper windload / slab.  Consistent failures with hand shears and CT tests ~5" down from surface at 2-3cm layer of slightly less dense snow, however failures took moderate force, and ECT tests did not fail or propagate.  Some very small isolated slabs failed on edges of couloir from ski/board compression force.  Snow depth >1meter in couloir.  Potential deep buried facet layer may exist in this area, and may well become a concern as new rapid snow load occurs Thursday night.  

   

Snowpit or crown profile photo or graph: 
Snowpack photos: 
Mt Gibbs - N Face
Approach to Gibbs Lake
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Strong
Air temperature trend: 
Cooling
Wind Direction: 
South
More detailed information about the weather: 

Windy day!  southerly winds at all elevations, very strong over ridgetops, moderate gusts at low elevations.  Warm day, above freezing up to 9,800' at noon.  

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