Skier Triggered Wind Slab @ Sonora Pass

Location Name: 
Skier Triggered Wind Slab @ Sonora Pass
Region: 
BWRA
Date and time of avalanche (best estimate if unknown): 
Sun, 03/25/2018 - 13:00
Location Map: 


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Obvious avalanche path

Observation made by: Professional Observer
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
41degrees
Trigger type: 
Skier
Crown Height: 
Less than 1 ft
Aspect: 
Northeast
Weak Layer: 
Other - explain below
Avalanche Width: 
20ft.
Terrain: 
Near Treeline
Elevation: 
9 600ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
75ft.
Number of people caught: 
0
Number of partial burials: 
0
Number of full burials: 
0
Did the avalanche hit a building, vehicle, or structure?: 
No
More detailed information about the avalanche: 

A skier triggered a small wind slab on a convex feature below treeline. Last week we had a deep slab avalanche (7' deep) a few feet adjacent, on the same feature.  Snow conditions remain variable, the latest snow was scoured and depostited making sensitve wind slabs that could be easily triggered.  A few roller balls where seen as well yesterday on the south facing aspects. The party involved were contacted & had not caused nor seen any similar avalanches at that time.

Avalanche Photos: 
Weather Observations
Blowing Snow: 
Yes
Cloud Cover: 
50% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
None
Air temperature trend: 
Warming
Wind Direction: 
Southwest
Accumulation rate: 
None
More detailed information about the weather: 

Temperatures were cold with moderate prevailing winds from the Southwest.  Any dry snow available was actively transported to lee aspects and will continue to do so with strong winds this week.