Natural Slab Avalanche near Cooke City

From email: "I'd hypothesize that this avalanche might have happened sometime yesterday.  There was a light rain event on April 21, and an associated widespread (but minor) wet loose avalanche cycle on steep northerly aspects the same day.  And it appears from the photo that the slab avalanche might have happened subsequent to all the roller ball/ well loose activity.  Yesterday was very warm here also, with a high of 47 deg F at the NE Entrance at noon." B. Fredlund