Classifying Tornadoes Tornadoes are classified by their wind speeds using a scale defined by Dr. Ted Fujita at the University of Chicago. The Fujita, or F, scale ranges from 0 to 5 for known tornadoes. In May 1999, an F5 tornado in Oklahoma produced the fastest wind speeds ever recorded on Earth318 mph! The Fujita scale actually has no upper limit, although tornadoes with F6 winds or above have never been recorded.
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