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A tornado is a narrow, violently rotating column of air that extends from the base of a thunderstorm cloud to the ground.
Tornado strength is categorized by damage. Based on the damages, where wind speeds are estimated through the Enhanced Fujita Scale.
Tornadoes occur in many parts of the world. The U.S. has one of the highest tornado occurrences in the world, with the Midwest and Southeast having a greater risk of tornadoes.
For more information regarding the probability of tornadoes throughout the year, please visit the Storm Prediction Center.