Avalanche: Chugach State Park

Location: Arctic to Indian

Date:
Observer:
Route & General Observations

Skied the Arctic to Indian tour route on 3/19/18, 12 large and fresh natural avalanches were observed on all aspects. The popular ski tour route crosses the run-out zones of numerous large avalanche paths, especially north of Indian Pass. This year especially, it is advised to carry avalanche safety gear, including beacons and shovels, and our party set the route in the middle of the valley and as far away from the toe of slide paths as possible. Given the extremely weak existing snowpack, we discussed the possibility of triggering slides from far above while traveling on the flats.  We were aware that it’s was not the steepness of the slope we were actually traveling on that mattered but the the steepness of the slope we were connected. We also noted that collapse failures of the snowpack can and have been observed traveling over a mile this winter, starting slides far away from the initial cause of collapse.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect WestElevation 3000ft
Slope Angle 35degCrown Depth5ft
Width 3000ftVertical Run 2000ft
Avalanche Details

Numerous large and fresh naturals observed on all aspects, with crown depths up to 6'.

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

Collapsing of the snowpack throughout the tour, especially on the north side of Indian Pass where the snowpack is thinner and weaker.

Weather & Snow Characteristics
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Weather

Up to 10" of new high-density (>20%) and extensive wind transport and wind loading, especially onto east and southeast facing slopes. Snow plumes extended up to 1000' vertically off many of the peaks surrounding this route.

Snow surface

Dense new snow, up to 10" of new snow at Indian Pass and on the south side of Indian Pass.

Photos & Video
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