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Avalanche: Chugach State Park

Location: Arctic to Indian

Date:
Observer:
Route & General Observations

Toured Arctic to Indian until about mile 12. As we gained elevation and began approaching the pass, we began to notice windslab formation and my partner experienced shooting cracks underfoot as he broke trail on a blown in old track. We then observed a Large D3 avalanche run out of a loaded gully across the trail ahead.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger NaturalAvalanche Type Soft Slab
Aspect EastElevation 3500ft
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Run 1500ft
Avalanche Details

Observed a D3R4 natural avalanche out of what appeared to be a cross-loaded wind gully. Light was flat--hard to tell the depth or length of the crown, but it we guess it was 2-3 feet deep. The slide ran an estimated ~1500 to 2000 feet and the powder cloud extended all the way to Ship Creek. We did not investigate the debris but another party did and said it extended a short distance beyond the skin track.

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?No
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?Yes
Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

S-1 most of the day and steady winds light to moderate when approaching the pass

Snow surface

Generally, new snow on top of settled powder.

Snowpack

No formal stability tests were performed.