Avalanche - Castle Lake - Right Peak

Location Name: 
Right Peak
Region: 
Castle Lake
Date and time of avalanche (best estimate if unknown): 
Sat, 03/04/2017 - 11:00am
Location Map: 
United States
41° 13' 52.0464" N, 122° 23' 28.6656" W
US


Red Flags: 
Recent loading by new snow, wind, or rain

Observation made by: Board of Directors
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
35degrees
Trigger type: 
Skier
Crown Height: 
Less than 1 ft
Aspect: 
Northwest
Weak Layer: 
Storm Snow
Avalanche Width: 
100ft.
Terrain: 
Near Treeline
Elevation: 
6 200ft.
Bed Surface: 
Old Snow
Avalanche Length: 
500ft.
Number of people caught: 
1
Number of partial burials: 
0
Number of full burials: 
0
More detailed information about the avalanche: 

Winds were blowing very strongly out of the south. The group was gathered on the top of Right Peak above Castle Lake. One skier decided to duck under a cornice out of the wind. As he dropped below the cornice, he triggered a small avalanche in which he was carried for about 5 feet before coming to rest in a small clump of trees where the slope angle was not as steep. The wind slab slid on the old snow surface. About 4 inches of snow had fallen but loaded on the westerly aspect to twice that amount, approx 8-10 inches.

Avalanche Photos: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Strong
Precipitation: 
Snow
Air temperature trend: 
Cooling
Wind Direction: 
West
Accumulation rate: 
Greater than 1 in. per hour
More detailed information about the weather: 

Very windy, heavy snow, poor visibility. Winds were out of the west at 0900 and then switched to southwest/south at about 10 to 1030 hrs. Active wind loading and cross loading of slopes.