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Avalanche: Turnagain

Location: Turnagain Pass Road Observation

Date:
Observer:
Route & General Observations

Drove from Girdwood to Johnson Pass. Visibility improved while driving through the pass and was able to see new D1-D2 avalanche activity from overnight and from the last few days. Overnight there were several new glide avalanches, two new large (D2) piles of wet avalanche debris on E. side of Seattle Ridge, and could see recent crowns on Tincan SW aspect. I also observed a sun triggered storm slab between 3pm and 3:30pm on the SW face of Tincan around 3000′. See photos below.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect SouthwestElevation 3000ft
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

SS-N-R1-D1.5 - SW aspect of Tincan, East of Hippy Bowl, occurred between 3pm and 3:30pm, likely trigger was the rapid warming from the sun, which just started to hit that aspect at 3pm. See photos below.

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)?No
Cracking (Shooting cracks)?No
Observer Comments

Recent avalanche activity due to a saturated snowpack in the mid elevation band and recent glide avalanches. Sun triggered storm slab in the upper elevations. In addition to the avalanches listed above there were many small (D1) loose snow avalanche in channeled terrain along Seattle Ridge, and loose snow avalanches on Magnum's W face, and Lipps W face.

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

Visibility dramatically improved between 2:30pm and 3pm with patches of clear skies and sun
Temps: 36F along Turnagain Pass road
Light winds: 10-15mph
Moderat rain at Ingram Creek, and light rain at Johnson Pass Trail head, otherwise no precip

Snow surface

Wet saturated snow along the road. 3-6" of standing water mixed with slush in Center Ridge and Motorized parking lots

Snowpack

N/A

Photos & Video
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