On the 13th November 2011 two skiers traversed the mid-cirque of Peruvian Gulch at Snowbird to reach the Gad Valley ridgeline, remotely triggering a 60 cm deep, 200 meter wide avalanche that covered their boot tracks below. They may not have even seen this slide in the low cloud and poor visibility.
Clipping into skis and board they skied the ridgeline then stopped. The skiers were above the south chute, a steep, rocky and tree lined couloir that drops 350 meters into Gad Valley. The first skier made three turns then - game over.