Crown profile at accident site in Boss Canyon. Avalanche occurred on 12/26/17. A rider was dragged through trees, mostly buried, and his ankle pinned between his sed and a large tree.
Crown face of snowmobile triggered avalanche. Triggered from low angle terrain in the run out zone. Alpha angle was 23 degrees. Heavily wind loaded. Crown averaged 2-3 feet deep was 6 feet deep in some places.