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We don't know yet how strong the Evansville tornado was. Here's how the classification system works.

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Tornadoes are classified using what's known as the EF scale, which factors in estimated wind speeds and related damage.

In 2005 , 62 tornadoes hit Wisconsin , which remains the record for the most tornadoes in a single year from the last 30 years .

The deadliest tornado to hit Wisconsin was an EF-5 that hit Colfax on June 4, 1958 .