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After the first national system of weather radars was implemented in the U.S. tornadoes claimed an average of 82 American lives per year. After the upgrade to Doppler radar in 1991 that average holds at 80. However, this data is skewed by the extremely deadly 2011 tornado season which claimed 553 lives. If we exclude that outlier, the average is lowered to 57 deaths per year.

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