Tornado Clusters Becoming More Deadly And More Common

One terrifying example is the April 25-28 outbreak in 2011, when some 350 tornadoes ripped across the south-central United States, killing more than 300 people. Outbreaks are responsible for 79 percent of tornado-related fatalities, said Michael Tippett, a climate and weather researcher at the School of Applied Science and Engineering and the Data Science Institute, both at Columbia University in New York. The researchers analyzed National Oceanic and Atmospheric Administration (NOAA) tornado re