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It is classified as a tornado when the circulation, which originates within a thunderstorm, is confirmed to have made contact with the ground. Usually this is confirmed through damage done by the tornado, but video or eyewitness testimony from a trained spotter can be used as well for tornadoes that cause little to no damage.

In some cases it can take extensive analysis to determine if any event was a tornado or strong thunderstorm winds, and tor determine if it was one or multiple tornadoes.

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