Avalanche: Turnagain

Location: Seattle Headwall

Route & General Observations

Shallow slab avalanche triggered by a snowboarder on the Seattle Headwall today, Saturday April 9th, 2022. Photo and video passed to us by Graham Predeger who was in the area.

Avalanche Details
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Trigger SnowboarderRemote Trigger Unknown
Avalanche Type Soft SlabAspect Northeast
Elevation 3400ftSlope Angleunknown
Crown Depth 10inWidth 80ft
Vertical Run 400ft  
Avalanche Details

Snowboarder triggered a slab avalanche between 8 and 12" deep and roughly 70-90 ft wide. Rider was able to ride off the moving slab and was not caught. It was reported as a D1.5 which means it was not quite large enough to bury a person as the debris was minimal. It was however, large enough that it could have knocked a person off their feet, but that did not happen in this case.

This is the same zone where there was another skier triggered slab slightly larger from 5 days prior (4.4.22). The weak layer in both avalanches is suspected to be the April Fools' Interface, which is a thin layer of facets and small buried surface hoar sitting on a thin crust that sits roughly a foot deep.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

No red flags were seen today, until this slab was triggered.

Weather & Snow Characteristics
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Sunny skies and light NW winds.
Temps were chilly and shady slopes stayed cool while the crusts on sunlit slopes slightly softened during the day.

Photos & Video
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