Today marks the 39th anniversary of the April 3rd-4th, 1974 Super Outbreak that killed over 300 people and injured 5,484 others. In the end 148 tornadoes touched down in 13 states, including central Illinois. Some of the worst hit cities include: Xenia, OH where 35 people were killed from and F5 tornado - Monticello, IN where the longest tornado path length of the outbreak was recorded: 109 miles - Brandenburg, KY where 28 people died and Guin, AL where a fast moving F5 tornado leveled the town. At one point in Indiana there were 16 tornadoes on the ground at the same time!
The only other outbreak that comes close to the Super Outbreak of 1974 would be the deadly April 26th-28th, 2011 outbreak where 293 tornadoes touched down in 21 states killing 324 and injuring over 2,000 people.