Sources

http://www.tornadoproject.com/

http://www.noaa.gov/tornadoes.html

http://www.spc.noaa.gov/faq/tornado/f-scale.html

http://www.tornadoproject.com/fscale/fscale.htm

http://www.tornadoproject.com/safety/safety.htm

http://www.fema.gov/hazards/tornadoes/tornadof.shtm

http://www.shelters-of-texas.com/welcome.html

http://www.infoplease.com/spot/tornado1.htm

http://www.cdli.ca/CITE/tornadoes_what.htm

http://www.42explore.com/tornadoes.htm

http://ehs.unc.edu/fire_life/erp/tornado.shtml

http://www.cdli.ca/CITE/tornadoes_alley.htm#World

http://www.hprec.unl.edu/nebraska/NEBTORNADOFACTS.htm

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