11th Annual Utah Snow & Avalanche Workshop Open and Motorized Sessions Oct. 27th.
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Observer Name: 
Chris W
Observation Date: 
Thursday, December 28, 2017
Avalanche Date: 
Thursday, December 28, 2017
Region: 
Park City Ridgeline
Location Name or Route: 
Big O
Elevation: 
9500
Aspect: 
Northeast
Slope Angle: 
35
Trigger: 
Natural
Avalanche Type: 
Soft Slab
Avalanche Problem: 
Persistent Weak Layer
Weak Layer: 
New Snow/Old Snow Interface
Depth: 
12"
Width: 
175
Vertical: 
200
Comments: 
Little pocket of 30 plus degree slope under the cliffs in Big O propagated and slid into the trees. It's unclear whether this was a natural or wildlife triggered slide, either way it is the largest I have ever seen in these trees... Scary stuff At 12" to 18" deep and 150 to 200ft wide this would have caused serious issues for anybody caught in its path. It slid 100 plus feet into the trees below, with it piling up between 3 and 5 feet on the trees in its path. Under the soft slab there was over a foot of facets that went straight to the ground, I'd bet this will be a repeater slide throughout the season. Just goes to show that even smaller, seemingly protected slopes will be sketchy for the entire season if they are over 30 degrees.
Coordinates: 
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