Please post here what ever reference you may find online.
Here is some of mine…
Tornados scales:
For this challenge we will be using the
The Fujita Scale of Tornado Intensity
F1
http://www.youtube.com/watch?v=r9RTTu9K3Sg
F2
http://www.youtube.com/watch?v=jZUeU6ZPJCI
http://www.youtube.com/watch?v=DNL7…feature=related
F3
http://www.youtube.com/watch?v=mZI87wFcqwg
F4
http://www.youtube.com/watch?v=x4MC…feature=related
F5 (AKA the finger of God)
http://www.youtube.com/watch?v=upnIBFvhdlM
http://www.youtube.com/watch?v=5o6K…feature=related
http://www.youtube.com/watch?v=I2qf7Re0K8E&NR=1
http://www.youtube.com/watch?v=jyKB…feature=related
Misc
[u][/u]
[b][/b]
Water Sprouts:
http://www.youtube.com/watch?v=F64e…feature=related