Natural observed that occurred around 16:00 hours in the large chute, riders left of Stupid Chute in Back Bowl, cornice collapse into wind loaded area, poor visibility yet appeared 45 feet wide at crown, NE facing side hill starting zone with slope angle at least 40 degrees and most likely greater, from cross wind loading subridge left flank area, debris minimal yet gouged out a contained area due to feature containment, ran 250 vertical and did not step down, ran on the same interface as all others, and appeared 12 to 24 inches deep.