Blizzard. Dumped 21in the previous 24 hr
Dropped into Northern bowl of Tumalo Mtn. There were already 5+ other skier tracks on the slope. Kept to fresh snow to skiers right close to current tracks. Halfway down slope felt movement and saw a huge amount of snow coming down from the rocks. The entire middle section of the bowl (where all the rocks are) slid. Skier was near the edge of the slide so did not get full force but was carried 100+ yards . Skier was under then came out on top. After went back up to inspects crown. Obvious layer at ~18in. Dug in general bowl and broke at same level with minimal effort. Left the scene and warned other headed up.