How are tornadoes formed?

How are tornadoes formed? All states have wind, rain, thunder and lightning, but get no tornadoes. I live in Oklahoma and we get them all the time.
Why is this?
Well, first you need a giant rotating thunderstorm, a supercell, which is created when cold polar air meets warm tropical air. This high-pressure air mass (the so-called trigger) needs to be pulled down from the sky by a low-pressure area, a so-called trailer park.
As soon as the high-pressure airmass passes over the low-pressure area — a tornado is formed.
No trailer parksĀ — no tornadoes. Many trailer parks — many tornadoes.
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