This avalanche on Crown Butte (seen from Miller Drainage) was triggered yesterday (Saturday) from by a snowmobiler. It broke as he rode up the hill and buried his sled, but not him. It is a southeast facing slope with the crown line around 9,900 feet. This slide path gets strong winds across slope as well as from the ridgeline. Steep wind-loaded slopes should be avoided. 50 mph gusts on Saturday stripped many upper elevation slopes and loaded others. Photo: GNFAC