Obs. from Negro Canyon

Location Name: 
Negro Canyon
Region: 
Donner Summit Area
Date and time of observation: 
Sat, 12/12/2009 - 13:00
Location Map: 
United States
39° 20' 14.7048" N, 120° 17' 56.112" 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: Professional Observer
Snowpit Observations
More detailed information about the snowpack: 

Loud whumping noises with collapsing on NE-N terrain.  HS= 82cm.  Several consistent CTE's at 40cm down from top, Q1 shears, believed to be the new snow/old snow interface.  Facets present on top of the 11/22 rain crust on N-E aspects, where reactive had moderate CT results.  RB2 MB 40cm down Q1 7000' NE aspect, 28 degree slope.  AirT .5, Tsurf -1.5.  Very wet out there.

Snowpit videos (tests, etc): 

RB Negro Canyon 003.AVI

Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Light
Precipitation: 
Snow
Air temperature trend: 
Static
Wind Direction: 
Southwest
Accumulation rate: 
Greater than 1 in. per hour
More detailed information about the weather: