Whistler Slackcountry (Blackcomb Glacier Area)

We skied north/northwest aspects. During our skin up there were a few instances that the snow broke apart in slabs at switchbacks. On our second run we approached a convex roll, performed a slope-cut, and a slab avalanche was triggered (see image, avalanche occurred at circle). The slab avalanche fractured approximately 80 meters across and was size 1