A tornado is a violent windstorm in the shape of a funnel cloud that reaches to the ground. If a tornado is coming, you’ll want to take cover.
A tornado can be quite severe and leave a lot of destruction in its wake, Tornadoes (or tornados — either is correct) tend to occur more often and with more severity in areas over flat lands, such as the Great Plains. That Kansas “twister” in The Wizard of Oz is a famous example of a tornado. Tornado is sometimes used to describe someone or something that acts like a tornado — with intense, violent energy or emotion.