Observed this avalanche on the east face of Cameahwait in the southern Flathead Range from Hwy 2 on Jan 15th at 1100. But suspect it ran sometime on the 12th/13th. Looks like a possible cornice trigger and likely that it stepped down to some persistent weak layer. Debris ran at least to 6500 ft (estimated) until it disappears out bottom of photo. More details under Avalanche tab.
Road observations