Valanga

Avalanche: Lake Mary

UAC ObserverSalt Lake
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Avalanche

Slab Width
18 m
Weak Layer
Depth Hoar
Trigger Type
Snowboarder
Vertical Fall
24 m
Avalanche Type
Hard Slab
Slab Thickness
122 cm
Trigger Detail
Unintentionally Triggered
Start Zone Aspect
Northeast
Avalanche Problem
Persistent Weak Layer
Start Zone Elevation
2926 m

Slab broke down to surface hoar that was growing on a buried rock band. Snowboarder didn't realize he triggered it until he was at the bottom of the slope out of the way. Everyone in the party had beacons, shovels, and probes, and knew how to use them, and were aware of potential dangers as listed by the UAC.