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Observations

Region: Turnagain
Location: Seattle Ridge flats
Observer:
Date:

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

Avalanche details

Trigger NaturalAvalanche Type Soft SlabAspect Unknown
Elevation 900ftSlope Angle 45degCrown Depth2ft
WidthunknownLengthunknown  

Observer Comments

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

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?YesCracking (Shooting cracks)?Yes

Observer Comments

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

Weather

Weather

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

Snow Characteristics

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

Video

Photos



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