Washington: Tornadoes in the United States are increasingly coming in swarms rather than as isolated twisters, according to a study by US government meteorologists published on Thursday that illustrates another trend toward extreme weather emerging in recent years.
Looking at tornado activity over the past six decades, the study in the journal Science found the total number of tornadoes annually remaining rather steady, averaging 495. Since the 1970s, there have been fewer days with tornadoes but plenty more days with many of them, sometimes dozens or more.
Looking at tornado activity over the past six decades, the study in the journal Science found the total number of tornadoes annually remaining rather steady, averaging 495. Since the 1970s, there have been fewer days with tornadoes but plenty more days with many of them, sometimes dozens or more.
© Thomson Reuters 2014
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