It is hard to say because the answer can change. Try looking in newspapers for information about tornadoes in Tornado Ally. Note that not all tornadoes occur in Tornado Ally.
No. A tornado is defined as a violently rotating column of air extending from the base of a thunderstorm to the ground. The vortex in a tornado tube may rotate, but it meets none of the other...
That is impossible to determine. Tornadoes have been around longer than there have been people have been around to record them. The first recorded tornado in North America was in 1671 in the then...