March 18, 1925
The Tri-State Tornado hits the Midwestern states of Missouri, Illinois, and Indiana, killing 695 people.
Ruins of the town of Griffin, Indiana.
The Tri-State Tornado of Wednesday, March 18, 1925, was the deadliest tornado in U.S. history. With 695 confirmed fatalities, the tornado killed more than twice as many as the second deadliest, the 1840 Great Natchez Tornado. The continuous ≥219 mile (≥352 km) track left by the tornado was the longest ever recorded in the world: the tornado crossed from southeastern Missouri, through Southern Illinois, then into southwestern Indiana. While not officially rated by NOAA, it is recognized by many as an F5 tornado, the maximal damage rating issued on the Fujita scale, and the rating is widely accepted by many.