Weather Archive
http://www.newton.dep.anl.gov/askasci/wea00/wea00225.htm
CSGNetwork.com
http://www.csgnetwork.com/tornadotable.html
Book
Lutgens, Frederick K., and Edward J. Tarbuck. The
Atmosphere: an Introduction to Meteorology. New York: Prentice
Hall, 2010. Print.
usatoday.com
http://www.usatoday.com/weather/resources/basics/2003-05-05-basics-tornadoes_x.htm
Supercell Diagram
http://weather.cod.edu/sirvatka/tstorm.gif