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The frequency of large-scale tornado outbreaks is increasing in the United States, particularly when it comes to the most extreme events. A study by researchers finds the increase in tornado outbreaks does not appear to be the result of a warming climate as earlier models suggested. Instead, their findings tie the growth in frequency to trends in the vertical wind shear found in certain supercells, a change not so far associated with a warmer climate.
Image credit: NOAA/National Weather Service
