Avalanche: Mother in Law

Observer Name
Grainger
Observation Date
Sunday, November 25, 2018
Avalanche Date
Sunday, November 25, 2018
Region
Mother in Law
Location Name or Route
Mother In Law Gully
Elevation
9600
Aspect
Northeast
Slope Angle
39
Trigger
Skier
Trigger: additional info
Remotely Triggered
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
22"
Width
125
Vertical
700
Comments
Widespread collapsing and shooting cracks throughout Upper Mill D North, Upper Millcreek, and the PC Ridgeline today on surfaces that held old snow NW through E. Remotely triggered this slide (arrow) while walking the PC Ridge in Mother In Law north of Square Top. Approximately 140' wide, 18-26" deep, running ~500-700'. Failed on small-grained facets on top of what's left of the crust that was mid-snowpack prior to the Friday/Saturday precipitation. Along with this persistent weak layer, the strong SW winds that came on the front end of the storm created wind loading and slabs along the ridge lines. This played a sensitivity role in this avalanche's start zone.
Comments
Widespread collapsing and shooting cracks on areas that held old faceted snow.
Coordinates

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