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Observer Name: 
Casey/ Craig Gordon/ Ted Scroggin
Observation Date: 
Wednesday, March 7, 2018
Occurrence Date: 
Wednesday, March 7, 2018
Occurence Time: 
11:30am
Region: 
Humpy Peak
Location Name or Route: 
Humpy Creek
Elevation: 
10300
Aspect: 
Northeast
Slope Angle: 
36
Trigger: 
Snowmobiler
Trigger: additional info: 
Unintentionally Triggered
Avalanche Type: 
Hard Slab
Avalanche Problem: 
Persistent Slab
Weak Layer: 
Facets
Depth: 
4'
Width: 
70
Vertical: 
250
Comments: 

Ted and I visited the site today and found a relatively shallow snowpack for early March.  Witness reported it was the 4th time up the slope. Sledder triggered slide mid-slope where the terrain gets slightly steeper. Snowmobiler was able to outrun the avalanche.  

 

Comments: 

Craig crawling around on the bed surface.

Looking up at the crown which was 3'-4' deep and approx 75 wide, running 250' vertically.

Overview from the bottom up. Curious that adjacent slopes with similar terrain characteristics didn't avalanche. 

Coordinates: 
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