April 11 marks the 50th anniversary of the second Palm Sunday tornado outbreak in the Midwestern United States.
Here are three things you may not have known about the outbreak:
One: There were 47 tornadoes reported across the states of Michigan, Ohio, Indiana, Illinois, Wisconsin and Iowa.
Two: 271 people were killed and 1,500 injured. It was the deadliest tornado outbreak in Indiana, where 137 were killed.
Three: The storms caused 6.23 billion dollars in damage in 2015 dollars.
Our question: What scale is used to rate the strength of tornadoes?
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