Human triggered R3 D3 Gardiner Headwall

At approximately 15:40 a D3 avalanche on the Gardiner headwall broke.  It was triggered by a snowboarder and his dog.  The run had already been tracked by skis and snow machines but the trigger point was slightly farther skier right and appeared to trigger a convex wind slab. 
 

Several skiers, boarders, and riders were in the area but there were no burials or injuries.