Flushed the back bowl around 11am. One person skied the east side of the face sometime earlier without causing any slide. I skied the west. Each of my turns off the top released storm snow that ran on the firm crust and, given the steepness of the slope, gained speed and accumulated to approximately 2+ feet deep when it passed me by just above the choke at around 9500 feet. I cut right and came down through the normal 2 trees exit. The slide came down the cliffs below the 2 trees choke and spread out for a couple hundred feet. Terrain was multiplying the danger posed by the snow instability today.