April 3 and 4 marks the 36th anniversary of the big tornado outbreak of 1974, which produced 148 tornadoes in 24 hours.
This outbreak included the F-5 tornado that leveled much of Xenia, Ohio.
Other tornadoes that affected our viewing area included:
F2 - Melrose, OH
F3 - Continental, OH
F2 - Hillsdale, MI
F2 - Hudson, MI
F2 - Erie, MI
F2 - Estral Beach, MI
F2 - Windsor, Ontario
Here are some websites which explain the events in great detail:
From the National Weather Service
A collection of data combined into one website