Snowpit and Observations from Castle Peak

Location Name: 
Castle Peak
Region: 
Donner Summit Area
Date and time of observation: 
Sat, 12/20/2014 - 09:00
Location Map: 
United States
39° 21' 32.508" N, 120° 21' 51.804" W
US


Red Flags: 
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain

Observation made by: Public
Snowpit Observations
More detailed information about the snowpack: 

Fairly wet heavy snow found in upper snowpack, with noticeable density change in upper 10cm of snowpack.  Pit was dug on East aspect at Castle Pass on small test slope that was not wind effected.  We skied Western aspects off Castle Peak.  During tour we encountered evidence of wind loading on North aspects, including minor cornice formation.  Approaching and stomping on minor cornices on small test slopes produced small cracks (up to 8 feet in length) and isolated wind slabs falling off cornices.  However, wind slab failure from cornice stomp would not propagate further down slope.  We avoided the North bowl due to wind transport, and Western aspects were largely not wind effected other than cross-loading on minor terrain features with a more Northern aspect.  Heavy wet snow and foggy day.

Snowpit or crown profile photo or graph: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Light
Precipitation: 
Mixed rain and snow
Air temperature trend: 
Static
Wind Direction: 
Southwest
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

Winds were increasing in speed to Moderate force as the day progressed.  Fog layer from 7900 to 8800ft.  Snow line was around 8000ft, with wetter snow below that.