March 21, 2021
March 21, 2021
Zone or Region:
Lundin N Couloir and S (Cocaine) Couloir
Did you trigger any avalanches? Yes
Was it intentional? No
Size 1: Relatively harmless to people
Location: Top 10 meters of the N Couloir of Lundin.
Depth: 25 cm
Width: 10 meters
Length: 10 meters. It ran to the basin floor but didn't pick up much snow along the way.
Cause: Skier 2 entered the couloir after skier 1 descended and was off to the side. Skier 2 entered with a similar but more aggressive ski cut, which triggered the slide. The slide broke beneath skier 2's feet and did not carry them.
Attempts at prevention: Prior to the slide, we cut the cornice, as well as ski cut the entrance to the couloir. It was not until skier 2 entered the couloir that the slope slid.
8 am to 1:30 pm
Broke trail up Lundin, skied the north couloir, boot packed back to the saddle, then skied the south couloir and out.
Shovel sheers and column test confirmed NWAC report of wind loading with slabs in places. There were signs of instability on unsupported areas between kick turns, but, once farther than 3 feet from the last kick turn, there were no signs of instability. The wind loading and slab was most prevalent in the N Couloir, where a wind slab was up to 30 cm deep.
Skiing conditions were great. Packed powder on both aspects. S Couloir had partially buried avalanche debris scattered throughout the second half of the descent. Lots of roller balls on west aspects below cliff bands.
It was snowing lightly most of the day. Wind was low. Visibility was intermittent.