50 foot wide, 18 inch deep soft slab on a steep north facing shot arround 9,300 that ran only around 200 feet on a 41-43 deg. slope. It was not a fast runner and was easily able to slip over to a small breakover and continue down the intended line. Shooting crack noticed when approacing the steep pitch. Some wind loaded pockets west of intended line. 20 intches of 10% at 9300 on the PC Ridgeline. Old-new snow interface, possibly dust layer? The UAC forecast for April 2 was spot on with depth and location.