Windy burly weather. We experienced many collapses on the climb up to the PC ridgeline. We anticipated the rollover above the trees could be a problem and stayed to skiers right. The last skier saw the crown. The slide ran through the trees and into the flats below almost coming to rest at the transition location. Slid to ground taking out all snowpack. Could not spot the west flank due to visibility. saw no other skiers in drainage.