Killer Tornadoes of 2013
Since 1971, the United States has used the Enhanced F-Scale to quantify tornado strength and destructive properties based on an assessment of 8 levels of damage to 28 separate indicators. In 2013, approximately 928 tornadoes touched down, including 52 that caused fatalities in 7 states.
Source: Storm Prediction Center at the National Weather Service, National Oceanic and Atmospheric Administration (NOAA).
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