Avalanche: Summit

Location: Colorado Peak Summit Lake

Date:
Observer:
Route & General Observations

Went to Summit Lake today to check out a couple avalanches I heard about which ran during yesterdays wind event. Found two separate avalanches on the corner of Colorado Peak and Fresno Creak. The further upstream event was witnessed from Fresno yesterday. (Video) It was apparently a windslab that did not step down into deeper layers. The second one was closer to “The Cabins'” and did step to the basal facets.

Avalanche Details
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Trigger NaturalAvalanche Type Hard Slab
Aspect EastElevation 3700ft
Slope AngleunknownCrown Depth 22in
Width 200ftVertical Run 1500ft
Avalanche Details

This was the second avalanche we investigated today. It happened yesterday February 1st. D2.5 Initially a windslab which stepped down to the basal facets. Photos taken from near the stauchwall. Runout angle was a little less than 25 degrees.

The other one was a D2 which did not step down.

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)?Yes
Observer Comments

Small shooting cracks in wind affected areas.

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

Overcast, began snowing about 4 p.m.

Snow surface

Degrading rain crust under NSF and V to about 1500'.
Wind affected above 2500'. Great skiing in between.

Snowpack

Didn't dig a formal pit. On investigation the slab stepped immediately to the basal facets. One tiny area broke mid-pack, (possibly ??? Dec. 1 layer) Below the stauchwall the slab stepped up again and the track had nearly a meter of old hardened snow still in it.

Photos & Video
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