Video: 'Minute by Minute: The Eruption of Mount St. Helens' (Mar. 27, 1980, at 0:45)
(Thursday, March 27, 1980, 12:36 p.m. PST) — Mount St. Helens, a 9,677-foot volcano in the Cascade Range of southwest Washington that has been dormant for 123 years, spewed forth clouds of steam and puffs of ash today in what scientists called the first stages of an eruption. Continue reading Volcanic Mount St. Helens, dormant for 123 years, erupts 40 years ago this hour #OnThisDay #OTD (Mar 27 1980)