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During the May 18, 1980 eruption, at least 17 separate pyroclastic flows descended the flanks of Mount St. Helens. Pyroclastic flows typically move at speeds of over 60 miles per hour (100 km/hr) and reach temperatures of over 800 Degrees Farenheit (400 degrees Celsius). Photographed here, a pyroclastic flow stretches from Mount St. Helens' crater to the valley floor below
-- USGS Photo by Peter W. Lipman, August 7, 1980

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Aerial view pyroclastic flow of August 7, 1980 on top of pyroclastic flows of July 22, 1980
-- USGS Photo by Lyn Topinka, September 30, 1980

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A U. S. Geological Survey geologist examines pumice blocks at the edge of a pyroclastic flow deposit
-- USGS Photo by Terry A. Leighley, USGS/Sandia Labs, October 17, 1980

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At edge of pyroclastic flow from Mount St. Helens
-- USGS Photo by Donald A. Swanson, May 30, 1980

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