Small Skier Triggered Avalanches in Tobacco Roots

From obs: "However, where wind or sun had strengthened the slab this surface layer was reactive, with sluffs entraining significant amounts of snow and one small slab that I managed to trigger. I popped this slab underneath a mild, somewhat cross-loaded convexity on a north face near treeline, and it broke around 30 feet wide, 4-6 inches deep, and ran ~ 300 feet (N, 9500', SS- ASu - R1/D1)."