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killer tornadoes

  1. Pierre Ducray

    US killer tornadoes: some key figures

    [Tornadoes] Number of US tornadoes per year: 1,225.1 (1991-2020 average). Lowest number*: 886 in 2014. Highest number*: 1,813 in 2004. [Killer tornadoes] Number of US killer tornadoes per year: 20 (1991-2020 average). Lowest number*: 9 in 2018 and 2009. Highest number*: 59 in 2011. [Killer...