Wind Slab Avalanche on East Ridge of Relay Peak

Location Name: 
Relay Peak
Region: 
Mount Rose Area
Date and time of avalanche (best estimate if unknown): 
Mon, 02/09/2015 - 10:00
Location Map: 
United States
39° 18' 42.3108" N, 119° 56' 3.75" W
See map: Google Maps
US


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Obvious avalanche path
Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
Dry
Slab
Crown Height: 
2 ft
Aspect: 
Northeast
Weak Layer: 
Storm Snow
Avalanche Width: 
100ft.
Terrain: 
Near Treeline
Elevation: 
9 500ft.
Avalanche Length: 
200ft.
More detailed information about the avalanche: 

I saw an avalanche at this location from across the valley as I was leaving the area. I was too far away to tell what triggered it. There were snowmobile tracks nearby and a broken cornice above the slide so either a snowmobiler or a cornice failure likely triggered the avalanche. From a distance it did not look like this wind slab broke down into the old snow layers. Slope angle is also unknown. All dimensions and time are estimated.