Backside of Stevens pass resort. 200 feet out of bounds.

Observed Roller balls, sun warming on southern facing aspects. 35-40 degree angle terrain, south facing aspect. 2 snowboarders caught and carried were half buried were able to get themselves out. Third skier in party above crown when it broke. ~50 ft length crown runout of ~150 ft. Storm slab ~2.5 ft in thickness let loose over faceted snow interface beneath.