This happened on Sunday December 6, 2015. Two skiers left the ski area near Corona Bowl planning to ski the backside of Stevens Pass. They realized how unstable the snow was and decided to try to find a low-angled exit. The terrain is quite complicated in this zone and they ended up triggering an avalanche that fully buried one of the skiers. Fortunately she was dug up in time with no major injuries. Be careful out there! It's going to take a little while for things to settle out.