Observations on Andesite Ridge - Sierra Crest West of Castle Peak

Location Name: 
Andesite Ridge
Region: 
Donner Summit Area
Date and time of observation: 
Wed, 02/15/2012 - 14:05
Location Map: 
United States
39° 21' 9.2412" N, 120° 21' 56.1024" W
See map: Google Maps
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: 

Hey Guys,  General wind scour from East slope.  4 to 5 inch windslab forming at or near tree line with scoured conditions on ridge above tree line. Heard three definitive whumphs.  Hand pit showed light crust of rain layer with unconsolidated snow underneath 3 to 4 inches deep.  New snow showed shooting cracks from ski pressure skinning. No observable signs of snow pack instability during or after whumph heard.  Felt like old snow collapsing under new snow from skier compaction.  No movement during ski descents. Heavy transport to West. 

Weather Observations
Blowing Snow: 
Yes
Air temperature: 
Below Freezing
Wind Speed: 
Strong
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: