Human triggered Avalanche Hemlock Ridge

AVALANCHE OBSERVATION
Hemlock Ridge

Drainage:

Submission Info
Josh Feinberg
Forecaster
Wednesday, March 25, 2020 - 2:00pm
Red Flags: 
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
Avalanche Type: 
Dry
Slab
Slope: 
36degrees
Trigger type: 
Skier
Crown Height: 
1 ft
Aspect: 
Northeast
Weak Layer: 
Storm Snow
Avalanche Width: 
75ft.
Terrain: 
Above Treeline
Elevation: 
10 400ft.
Bed Surface: 
Storm Snow
Number of partial burials: 
0
Number of full burials: 
0
More detailed information about the avalanche: 

Avalanche triggered just on leeward side of subtle cross-slope rib. While travelling and probing I felt a subtle density change within underlying storm snow, stoped and dug a test pit: ECTP6 27cm down under subtle denser layer of wind deposited snow.  Stomp with ski a few feet further out from rib resulted in crack propogating across slope.  8-12" crown propogated ~75' out across slope.   R2-D2. Couldn't tell how far avalanche ran as it went out of site over convexity.  

I didn't find concerning snowpack structure or signs of instability anywhere before this point on my ascent today, besides the obvious heads-up of snow blowing that kept me keenly alert and on the look-out.   

Avalanche Photos: 
Snowpit or crown profile photo or graph: 
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
Snow
Wind Direction: 
West
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

Periodic snowfall reaching S1-2 throughout day, W winds with moderate gusts in exposed areas below tree line and above.  ~3-4"+ new snow from last night / today in sheltered areas, wind filled in skin track and other tracks where exposed quickly.    

Number of People Caught: 
0
37° 44' 34.9764" N, 119° 6' 6.4044" W
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