Scientists: We’re not sure why tornado outbreaks are worse
A recent study in the journal Science reveals that tornado outbreaks are getting bigger, Iowa Environmental Focus reported. Scientists aren’t sure why. The study was published days after 18 tornadoes hit parts of the southeastern United States. The study’s lead author, Michael Tippett of Columbia University, said that 50 years ago tornado clusters, may have involved about 12 tornadoes; now they average roughly 20. The researchers studied the most extreme outbreaks, which happen about once every five years, and discovered a steady increase in tornado cluster size since the mid-1960s.
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