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The HazardHub Tornado Risk

The HazardHub Tornado Risk File is part of the Convective Storm Suite which also includes Lightning, Damaging Winds, and Damaging Tornado.

The U.S. experiences more tornadoes than any other country. Tornadoes accounted for 39.1 percent of insured catastrophe losses from 1995 to 2014. In 2014, insured losses from U.S. tornadoes/thunderstorms totaled $12.3 billion, up from $10.3 billion in 2013 and 2014 losses were the fourth highest annual total on record. The number of tornadoes rose to 1,177 in 2015 from 886 in 2014.

The costliest U.S. catastrophe involving tornadoes, based on insured losses, occurred in April 2011. It hit Tuscaloosa, Alabama, and other areas and cost $7.7 billion in insured damages in 2014 dollars. That event was the 10th costliest U.S. catastrophe, based on insured losses. The second costliest catastrophe involving tornadoes, based on insured losses, struck Joplin, Missouri, and other locations in May 2011. The catastrophe cost $7.2 billion in insured losses in 2014 dollars 1 . On average, 80 deaths each year are directly attributed to tornadoes 2 .

Tornado events are a product of convective storms, often called thunder storms, that occur everywhere in the United States but most frequently in the areas east of the Rockies where warm, moist air from the Gulf of Mexico meets cooler air sweeping southward.

The HazardHub Tornado Risk File was compiled from long-term NOAA Doppler radar and other sources. The NOAA data contains almost 30 years of tornado event data for every county in the United States consisting of over 31 million records.