NWS: Alpena tornado rare EF4
The tornado that demolished an Alpena farmstead last week was an EF4, the National Weather Service announced Wednesday.
The frequency of an EF4 tornado occurring in South Dakota is rare, according to Todd Heitkamp, a warning coordinator meteorologist for the NWS.
"Across the entire country, it was one of five EF4 tornadoes last week," Heitkamp said.
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