small windslab avalanche on Mt. Judah

Location Name: 
Sugar Bowl/ Mt. Judah
Region: 
Donner Summit Area
Date and time of avalanche (best estimate if unknown): 
Sun, 12/18/2016 - 12:31
Location Map: 
United States
39° 18' 24.7248" N, 120° 19' 12.5868" W
See map: Google Maps
US


Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
Observation made by: Guide at Alpenglow Expeditions
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
39degrees
Trigger type: 
Skier
Crown Height: 
Less than 1 ft
Aspect: 
West
Weak Layer: 
Storm Snow
Avalanche Width: 
50ft.
Terrain: 
Near Treeline
Elevation: 
7 730ft.
Bed Surface: 
Old Snow
Avalanche Length: 
25ft.
More detailed information about the avalanche: 

Slide intentionally kicked off by L1 field group on test slope. WS SS AS D1 15m across x 8m downslope on W-facing 39° convex rollover at 7730’, failing on the 12/15 rain crust.

Avalanche Photos: