My latest in the May 2014 issue of WIRED:

On May 20, 2013, a mass of swirling wind gouged a path of destruction across Oklahoma, killing 24 people and causing $2 billion in damage. And earlier this week a deadly cluster of tornadoes ripped through the midwest and the south, killing more than dozen people and injuring hundreds. This kind of destruction would seem to indicate that tornadoes are getting worse. But with the way we currently measure twisters, it’s nearly impossible to know. Now James Elsner, a geographer from Florida State University, has a fix.

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