Well, a REAL tornado is a funnel of air which decends from the clouds, (Most likely to be Cumonolibious) and reaches the ground, destroying anything in it's path. A tornado useally lasts for 15-20 minutes, with wind speeds up to 300mph! On the 3rd April an outstanding 24 tornadoes occured in Tornado Ally. (Kansas, Nebraska, Oklahoma and Texas) The tornado season starts from around April to August. Beware!
There was a tornado (Also known as a twister, cyclone or even mistakenly called a hurricane) in The Wizard of Oz, starring Judy Garland as Dorothy Gale. The film was made in 1939. There are several tornado films too such as, Atomic Twister, Tornado, Twister, Night of the Twisters and Tornadoes - we hardly Knew Ye. There was an episode about tornadoes in Eerie Indiana.