"Tornado alleys" - where should they be?

[lefthandhummingbird]

Climatological question here: where is it reasonable to place areas with a high risk of tornadoes? It doesn't really seem to be something that can be calculated by looking at the typical climatological models, so which are the factors one should look at?

[Jean-Abdel]

Places between mountains and tropical seas, where hot moist air mixes with cold air from the mountains.

[waldronate]

https://en.wikipedia.org/wiki/Tornado_climatology might offer some insight into the problem.