“Something’s up,” Tippett said. “The tornadoes that do occur are occurring in clusters – AP

WASHINGTON (AP) — The most extreme tornado outbreaks are mysteriously spawning many more twisters than they did decades ago, a new study claimed. The once-every-five-years-or-so outbreak that might have involved 12 tornadoes 50 years ago now has on average about 20, said Columbia University applied physics professor Michael Tippett, lead author of the study in Thursday’s journal Science . The study comes in the end of a year that has been on track to have the fewest tornadoes on record, but is also on the

Source: Study: Biggest tornado outbreaks are spawning more twisters

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