Mammoth Rock snowpack

SNOWPACK OBSERVATION
Mammoth Rock Bowl
Submission Info
Forecaster
Friday, December 25, 2015 - 11:45pm
Red Flags: 
Recent loading by new snow, wind, or rain
37° 36' 43.6428" N, 118° 59' 39.4476" W
Snowpit Observations
More detailed information about the snowpack: 

Went up Mammoth Rock Bowl today to check out avalanche crown at ridge top.  See avalanche observations for information on that.  

-See attached image for first pit.  Several others dug 1/2way down slope and 3/4 of the way down slope.  All showed different results.  

-Mid elevation (~9200') quick pit below rock ridge on ENE facing 38 deg slope in relatively shallow area (~85cm snow depth) --> ECTP moderate force, Q1 in new storm layers from snow on Dec 23.  No failure at ground.  

-Lower elevation pits (8900') showed much weaker basal snowpack.  1)  38deg slope, NNW facing under slight ridge, shallow snowpack (65cm) --> ECTPV x 2 27cm down (failed upon isoalation).  Newer slab of snow from this week's storms failed on older Dec 11-14 snow which is faceting in this shallow area.  Deeper in the snow pack the pre-Dec 11-14 snow had more developed/larger facets to ground.  Strong temperature gradient exists here through the snowpack, well over 1deg C per 10cm, which will continue to weaken the snowpack structure (tending snow towards weak facets as opposed to strengthening rounds) if it persists with cold air temperatures.   2)  Same elevation, North facing 32deg slope, 135 cm depth-->CT12 Q2 30cm down, CT12 Q3 in mid basal facets near ground.  CTV(failed upon shovel placement on column) Q3 in mid basal facets near ground.  

 

    

Snowpit or crown profile photo or graph: 
Snowpack photos: 
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: 
Static
Accumulation rate: 
None
More detailed information about the weather: 

Cold, ~-10deg C.  Calm winds, mostly sunny.

-- placeholder --

ESAC receives significant financial support from ...