Avalanche: Monitors 12/29/2011

Observer Name: 
mark white
Observation Date: 
12/29/2011
Occurrence Date: 
12/29/2011
Occurrence Time: 
12:00am
Region: 
Salt Lake
Park City Ridgeline
Monitors
Location Name: 
West Monitor Bowl
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Avalanche Characteristics
Elevation: 
10100'
Aspect: 
Northeast
Slope Angle: 
38
Trigger: 
Skier
Trigger: additional info: 
Intentionally Triggered
Avalanche Type: 
Soft Slab
Weak Layer: 
Facets Below Crust
Depth (avg): 
unknown
Width: 
50'
Vertical: 
600'
General Comments

Went to West Monitor again to see if 3" of grauple and strong winds might over load the extremely weak snow pack, affirmative. Decent sized cornices on the ridge line made triggering a soft slab extremely easy. One drop of a small cornice initiated a soft slab that released and propegated out to about 50ft wide, and ran about 700ft before the slope angle decreased.

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General Comments 2

Crown was about 7 to 10" at the deepest point. Inspection of the crown revealed it ran under the thin and fragile rain crust, must have collapsed the crust in the starting zone were it was wind loaded then gouged down into the facets and left alot of dirt and bushes uncovered on its path down the slope. Moved with good speed until it reached were the slope angle decreases, nice powder cloud. Some bad pics of the crown.

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General Comments 3

New snow consisted of 3" of grauple sitting on top of a fragile rain crust, crust was so fragile could only tell it was there by reaching in with a bare hand. did find a peice strong enough to dig out without breaking it. Cornices breaking back farther than I expected almost took a ride down the hill with one, first day in a long time I could make a snow ball.

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