Avalanche: Big Drift/Skyline Summit

Observer Name
Steve Cote
Observation Date
Thursday, December 3, 2015
Avalanche Date
Monday, November 30, 2015
Region
Big Drift/Skyline Summit
Location Name or Route
Big drift
Elevation
9700
Aspect
Northeast
Slope Angle
37
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Wind Drifted Snow
Weak Layer
Facets
Depth
1"
Width
15
Vertical
20
Comments

Looks like it was triggered by a snowmobile, just at the break of the ridge, Last weeks observations found that the old snow had faceted and we got a release of the of a small slab, much the same.

FORECASTER NOTE:  This may have been snowmobile triggered or may have released naturally.  I saw a similar cornice fall that fell naturally from recent wind loading.  However, I also experienced a collapse of the snowpack under my machine in a drifted area.  The collapse was due to the new drift sitting on old faceted (sugary) weak snow.  Brett Kobernik

Coordinates

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