Natural Avalanche Cycle occurred during High PI Rates on the evening of the 26th. Suspected weak layer was the burried Graupel Layer that was previously reported from Observation on 4/26/16. Everything in the Brighton Back Bowls from the Back Door Protection Shot all the way around to Old Reliable ran and was connected.Similar activity off of much of the Wolverine Cirque with THC Chute and Steep Terrain below East Facing Patsy Marley. Debris did not run full path. Slides appeared to be R2, D2's at the most with piles ranging from 2 feet deep to 3 feet deep.