Editing Tornado (section)

=== Track length ===
In the United States, the average tornado travels on the ground for {{convert|5|mi|km}}. However, tornadoes are capable of both much shorter and much longer damage paths: one tornado was reported to have a damage path only {{convert|7|ft|m}} long, while the record-holding tornado for path length—the [[Tri-State Tornado]], which affected parts of [[Missouri]], [[Illinois]], and [[Indiana]] on March 18, 1925—was on the ground continuously for {{convert|219|mi|km}}.<ref name="Handy Weather Answer Book" /> Many tornadoes which appear to have path lengths of {{convert|100|mi|km}} or longer are composed of a family of tornadoes which have formed in quick succession; however, there is no substantial evidence that this occurred in the case of the Tri-State Tornado.<ref name="significant tornadoes">{{cite book|first=Thomas P.|last=Grazulis|title=Significant Tornadoes 1680–1991|date=July 1993|publisher=The Tornado Project of Environmental Films|location=St. Johnsbury, VT|isbn=1-879362-03-1}}</ref> A 2007 reanalysis of the path suggests that the tornado may have begun {{convert|15|mi|km}} further west than previously thought.<ref>{{cite web|url=http://apollo.lsc.vsc.edu/ams/AMS%20VP/Storm%20Conference/NESC%20Presentations/32ndNESC_Presentation/Banquet/Doswell.ppt|archive-url=https://web.archive.org/web/20070614014358/http://apollo.lsc.vsc.edu/ams/AMS%20VP/Storm%20Conference/NESC%20Presentations/32ndNESC_Presentation/Banquet/Doswell.ppt|url-status=dead|archive-date=2007-06-14|title=The Tri-State Tornado of 18 March 1925 |publisher=Reanalysis Project|access-date=2007-04-07|first=Charles A. III|last=Doswell |format=Powerpoint Presentation}}</ref>