| Trigger | Natural | Remote Trigger | Unknown |
| Avalanche Type | Hard Slab | Aspect | East |
| Elevation | 3700ft | Slope Angle | unknown |
| Crown Depth | 22in | Width | 200ft |
| Vertical Run | 1500ft |
Avalanche: Summit
Location: Colorado Peak Summit Lake
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
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.
Obvious signs of instability
| Recent Avalanches? | Yes |
| Collapsing (Whumphing)? | No |
| Cracking (Shooting cracks)? | Yes |
Observer Comments
Small shooting cracks in wind affected areas.
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.
D 2.5 avalanche taken from near the stauchwall. Photo taken Feb. 2 2021
D2 avalanche photo taken yesterday Feb. 1 2021
Today's snow surface at 2000'