March 18, 1925:

The worst tornado in American history slammed Missouri, Illinois, and Indiana. Dubbed the "Tri-State Tornado", the estimated F5 had a path length of over 215 miles, was on the ground for ~3.5 hours, and had an estimated forward speed over over 60 mph.

#wxhistory Track Map Credit: via NWS PaducahNewspaper Clipping Credit: The Indianapolis Times via newspaDamage Photo Credit: Edeans | Wikimedia CommonsDamage Photo Credit: Jackson County Historical Society via N
695 people were killed, making this event the deadliest tornado to ever strike the US. 33 fatalities occurred in a single school at De Soto, Illinois. Over 2000 injuries were reported.

Numerous towns along the path were devastated, with some losing ≥90% of their structures. Damage Photo Credit: NOAA Photo LibraryDamage Photo Credit: Topical Press Agency/Hulton Archive/GetDamage Photo Credit: Topical Press Agency/Hulton Archive/GetTrack Map Credit: Encyclopædia Britannica, Inc./Kenny Chmie
The Tri-State tornado was part of a larger outbreak of (at least) nine tornadoes

An estimated F4 that struck northern TN/southern KY swept away homes, shredded trees, and killed 41 people. Another massive F4 killed 4 people and leveled entire farms south of Elizabeth, Indiana Tornado Track Map Credit: Tornado Archive (Tornadoarchive.coDamage Photo Credit: Tennessee State Library and Archives (hNewspaper Clipping Credit: The Courier-Journal via newspaper

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