In total, 343 tornadoes tore through the eastern half of the United States and more than 300 people lost their lives, according to the National Centers for Environmental Information.
Five of the deadly tornadoes were produced in Alabama and more than 2,000 people were injured, NCDC reports.
On April 27, 2011, Alabama had 62 tornadoes, Zontini said. The tornado classified as an EF 5 and had a continuous path of 132 miles.
“Ohio had a weak tornado on the April 27th, 2011 in New Carlisle which was an EF 0,” Zontini said.
The National Weather Service said the system was the deadliest single outbreak since April 1936.
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