When the largest tornado ever recorded touched down in central Oklahoma, amateur storm chasers, professional meteorologists, and thrill seekers were expecting a show. What they got was a deadly lesson in the unpredictable power of nature. On May 31, 2013, forecasters warned that the approaching system posed extreme danger, but that didn’t do much to scare away anyone willing to risk it all to get close to a Category 5 tornado. For them, the fact that science couldn’t fully explain how a twister is formed or how it might behave was a big part of the appeal.

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