PRELIMINARY: The avalanche occurred in South Waldron Creek, 0.75 miles north of Teton Peak, Teton County, at approximately 15:42 on January 5, 2019. This was a very large, hard slab avalanche (could bury/ destroy a car and break trees). The crown extended approximately 1750 feet across two east and east-southeast facing bowls at about 7800 to 7900 feet elevation. It varied from 1 to 5 feet deep, with an average depth of roughly 3 feet. The debris ran 700-800 vertical feet. The slide was a persistent slab avalanche that broke on weak, faceted snow above a crust roughly 11 inches above the ground. The slide paths were convex, with variable snow depths and numerous trigger points. When the slide released, 1 rider (Rider 1) was on the slope. A second rider (Rider 2) was off his snowmobile lower on the slope. Rider 1 was caught, carried, partially buried and injured. Rider 2 was caught, carried, fully buried and killed.
Flathead Avalanche Center report and images