Skier caught and carried on Cowen

Party of 3 skiers triggered a wind slab about 500 feet below the entrance to Moe's Gullies, just south of Mount Cowen. Skier 1 ski cut the entrance to the couloir, with no visible effect. Skiers 1, 2, and 3 then one by one skied down about 200 feet before cutting into the skiers right gully. This was also skied one at a time, after which they regrouped about 500 feet below the entrance/ridge. Skier 1 then traversed out so ski the apron, and triggered a D1 avalanche on a wind slab which broke about 100 feet above. Crown is estimated to be about 20" at the deepest, and was at the transition point between the choke of the parallel gully and the apron below. Skier 1 was carried about 200 feet before being able to self arrest. Skiers 2 and 3 were in a safe spot and not caught. Avalanche ran the full length of the path, and triggered sympathetic avalanches on the way down. This created a relatively large debris pile compared to the size of the initial release. Avalanche seemed comprised mostly of the last storm snow running on a hard crust below. 

No injuries were sustained.