Inconsistent record keeping, changes with tornado reporting systems such as the Fujita Scale and Doppler radar, increased public awareness, the use of technology to report tornadoes, and the shifting populations have all played a role in increasing the number of reported tornadoes in Illinois and in the United States. The role that global warming has played in the increased number of tornadoes and their severity since 1950, is still unclear. Several more years of tornado data collecting is needed for us to have a more definitive answer as to whether tornadoes are increasing in frequency and severity and the role global warming may or may not.be having on tornadoes.
Earth Science 101
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Westburg, Matthew E., "Tornadoes: Are They Becoming More Frequent and Severe?" (2014). Natural Sciences Poster Sessions. 57.