All times in UTC ·
Dashed edge = started before, or continues beyond, this day
Events on Sunday 18 May 1980 1
1980Mount St. Helens EruptionDeadliest volcanic eruption in US historyA major eruption on 18 May 1980 blew out the north face of Mount St. Helens in Washington State, killing 57 people. It buried forests and rivers under ash and debris and sent an ash plume across the United States. The eruption remains the deadliest and most economically destructive volcanic event in US history.