Explosive triggered slide at Big Sky

"We triggered a large avalanche in the Cirque with a 5lb. shot dangled from the Tram.  The slide broke 3’ deep and took out the Dobies, Cron’s and part of the Ramp Shot avalanche paths.  Hard slab- 1F minus generally.  Storm slab from the past 8 days.  The slide ran on a crust that formed from the left over snow from mid- October that got warmed in the 3^rd week of October.  The weak layer was just a thin layer of lower density snow trapped under the hard slabs- didn’t seem to be particularly faceted. Some grauple. The crust is not very hard or slick, about 2cm thick, and crumbled easily in hand... The slide had good propagation and the crown was at least 300’ long- impressive debris pile." -Big Sky Ski Patrol