Fujita scale
The fujita tornado intensity scale is used to rate the intensity of a tornado by examining the damage caused by the tornado after it has passed over a man-made structure
http://www.tornadoproject.com/fujitascale/fscale.htm
Tekening supercell
Tekening supercell
http://narjan.suddenlaunch3.com/index.cgi?board=extreme&action=print&num=1118675587
Tornado's
Website van de vereniging voor weerkunde en klimatologie. website over weer en klimaat in de hele wereld.
http://www.vwkweb.nl/index.html?http://www.vwkweb.nl/weerinfo/weerinfo_tornado.html
Tornado's in Europa
Tornado's in Europa
http://www.torro.org.uk/