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Avalanche: Turnagain

Location: Seattle Ridge flats

Date:
Observer:
Route & General Observations

Took a close look at several avalanches close to the road in cut bank along Granite creek. Visibility was difficult to see the higher terrain, but we did catch a glimpse of one natural storm/wind slab on the South end of Seattle Ridge that sent debris to valley bottom. This avalanche was around 300+’ wide and likely 2-3′ deep and running 1,500-2,000′.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect UnknownElevation 900ft
Slope Angle 45degCrown Depth2ft
WidthunknownVertical Rununknown
Avalanche Details

Several avalanches along the cut bank of Granite Ck. All were 2-3' thick and failing in facets 2-4" below the storm snow.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

All signs of instability were hard to miss. Large collapses, shooting cracks and recent avalanches.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

Overcast/obscured skies, light Northerly winds and temps in the mid 20's.

Snow surface

2-3 feet of new 'moist' snow from overnight. Difficult travel and boot penetration was up to the hips or further. Low elevation winds have blown the new snow into deep drifts in places.

Snowpack

The new snow is sticking to the old surface snow in the lower elevations, but failing in weaker facets below. See photo of crown of one of these slides.

Photos & Video
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