The researchers estimated that the number of tornadoes in the most extreme outbreak in a five - year interval doubled over the last half - century. (sciencedaily.com)
One 2016 study found signs of a relationship between clusters of tornadoes in violent outbreaks and climate change. (propublica.org)
In the dataset used in the study, 2011 was one of the top three years for tornado damage since 1950. (usatoday.com)