Forecasting Ashfall Impacts from a Yellowstone Supereruption
- Yellowstone is one of a few dozen volcanoes on earth capable of "supereruptions" that expel more than 1,000 cubic km of ash and debris.
- The plumes from such eruptions can rise 30 to 50 km into the atmosphere, three to five times as high as most jets fly.
- Yellowstone has produced three supereruptions in the past 2.1 million years. The most recent was 0.6 million years ago.
- Eruptions this large can create their own continental- scale wind field, pushing ash more than 1,000 km against the prevailing, ambient wind field.