Big Sky Ski Patrol saw evidence of a natural avalanche in the closed ski area.
From email: "saw evidence of a large avalanche that ran in 3 Forks area of The Headwaters... NE aspect in the probable start zone (could not see a crown) that likely saw significant wind loading Monday. It ran full track and broke some branches and small trees in the runout.
That was the only activity I saw (3 Forks is an avalanche factory with large storms). Definite wind effect across the alpine."