Shooting crack in Negro Canyon

Location Name: 
Top of Negro Canyon
Region: 
Donner Summit Area
Date and time of observation: 
Tue, 12/29/2015 - 14:00
Location Map: 
United States
39° 20' 20.4144" N, 120° 18' 16.9668" 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: Guide at Alpenglow Expeditions
Snowpit Observations
More detailed information about the snowpack: 

We found an obvious wind slab, loaded from the recent NE winds.  An agressive stomp with skis was able to produce a shooting crack that ran for approx. 20ft. No other signs of instability today. 

Snowpack photos: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
None
Air temperature trend: 
Cooling
Wind Direction: 
Southwest
Accumulation rate: 
None