Avalanche occurred in the "Pinner" slide path near the "Skier's Summit" of Williams Peak. The reporting party thought the slide was remotely triggered on Sunday 1/15/2023, but they did not observe the avalanche until Monday 1/16/2023. They are not confident in the exact time the slide occurred or the triggering mechanism: it could have been remotely triggered on 1/15, or it could have naturally released late afternoon 1/15 - late morning 1/16.
The slide was in very steep, obviously wind-loaded terrain immediately beneath a cornice. The debris was dirty and had remnants of small trees or parts of trees in it, likely due to the relatively wide crown running over exposed rock ribs with small trees.