Park Butte, SW of Mt. Baker, WA A single snowmobiler triggered and was caught, carried and killed in a large (D3) slab avalanche on Park Butte in the Mt. Baker National Recreation Area. The avalanche was triggered just below the summit on a NE aspect near 5400'. The victim was carried 1000' through a gully and sparse trees. The avalanche was 200 ft (60 m) wide and averaged 4' deep (1.2m). It failed on a 2 cm thick layer of facets above a rain crust.