Before revision: Young forests (trees <2 years old) are most at risk from ash falls and are likely to be destroyed by ash deposits >100 mm.
After revision: Defoliated and fallen trees on Windy Ridge, Mount St. Helens, 22 years after the 1980 eruptionYoung forests (trees <2 years old) are most at risk from ash falls and are likely to be destroyed by ash deposits >100 mm.