Avalanche

Avalanche: Upper Horse Creek

TrenbeathMoab
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Quick report

Slope Angle
35°

Avalanche

Slab Width
152 m
Weak Layer
Facets
Trigger Type
Natural
Vertical Fall
305 m
Avalanche Type
Hard Slab
Slab Thickness
91 cm
Avalanche Problem
Wind Slab
Start Zone Elevation
3475 m

Prolonged strong westerly winds and incremental snow storms between Dec 18, and Dec 23 produced wind slab on top of wind slab until breaking point was reached. Prior to the light snowfall of 4" on the 18th, starting zones had been severely scoured out with only 12" -18" of faceted and wind crusted snow left on the ground. 2' of snow accumulated during the 5 day period with the last 15" coming in with 1.75" of water between the 22nd and 23rd. Failure was on facets near the old, wind crusted surface.