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Classic tornadoes, which include almost all strong tornadoes, form from the mesocyclone of a supercell. Here we have a thunderstorm with a strong rotating updraft. Under the right conditions a downdraft can cause this updraft to tighten, intensify, and extend toward the ground to form a tornado.

There are also landspouts, which form in a similar way to fair-weather waterspouts. In this case, a broad, weak circulation at ground level moves under a developing thunderstorm. The circulation gets pulled into the storm's updraft, tightening and intensifying as a result. These tornadoes rarely exceed EF1 intensity.

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