Avalanche

Slippery Bill, Great Bear Wilderness

Avalanche.org observerFlathead Range & Glacier NP
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Quick report

There were mixed weather conditions on our way up, some blue skies followed by snow and cloud and wind. No signs of instability. Upon reaching the summit, we changed decisions from skiing back down the route we came up and opted for the North Western facing slope, mixed between 30-40 degree angles. We skied one at a time down West facing slope. Around ~6,800ft second skier triggered an avalanche. Both skiers skied out of the avalanche path , no one was dragged or carried. Estimated crown depth to be 1.5ft and 40 ft across. We suggest a wind loaded area failed, stepped down, and broke at the persistent layer, gathering more snow and speed as it moved approximately 600ft to the bottom of the bowl. No signs of instability.

Weather

Air Temp
20<
Cloud Cover
scattered
Wind Loading
unknown
Recent Snowfall
6in
Snow Avail For Transport
small smounts

Weather was variable, sunshine and mixed flurries/snowing.

Snowpack

We estimated about 6-8in overnight, on top of a firm crust

Avalanche

Size
D2 R2
Type
HS
Aspect
W
Trigger
AS
Elevation
6875 ft

Unintentionally-triggered slide that stepped down to deeper weak layer.