A new study of tornado activity in the U.S. suggests climate change may be a factor in the frequency and intensity of the storms. Tornadoes are appearing on fewer days throughout the year than they did in the past, researchers found. However, on days when tornadoes occur, the storms are appearing in higher numbers. "The bottom line is that the risk of big tornado days featuring densely concentrated tornado outbreaks is on the rise," the study says.
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