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How far did the ash from Mount St. Helens travel?

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Welcome to CoreFacts, where we're always short on time and big on science. I'm Brian Campbell. Today's question is …

How far did the ash from Mount St. Helens travel?

The May 18, 1980 eruptive column at Mount St. Helens fluctuated in height through the day, but the eruption subsided by late afternoon. By early May 19, the eruption had stopped. By that time the ash cloud had spread to the central United States. Two days later, even though the ash cloud had become more diffuse, fine ash was detected by systems used to monitor air pollution in several cities of the northeastern United States. Some of the ash drifted around the globe within about 2 weeks.

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Title: How far did the ash from Mount St. Helens travel?


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Date Recorded: 6/10/2009

Usage: This audio file is public domain/of free use unless otherwise stated. Please refer to the USGS Copyright section for how to credit this audio.

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