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A tornado begins in the organization stage, when it forms through a series of updrafts among cold and warm air systems. When the swirling air touches the ground, it is officially a tornado. In the mature stage, a tornado reaches its full development in terms of base size and wind speed.
Hi the four stages of a tornado are : The organization stage Mature stage Shrinking stage Decaying stage These stages begin because of atmospheric conditions during a thunderstorm.