What is a tornado?
A tornado is a narrow, violently rotating column of air that extends from the base of a thunderstorm to the ground. Because wind is invisible, it is hard to see a tornado unless it forms a condensation funnel made up of water droplets, dust and debris. Tornadoes are the most violent of all atmospheric storms.

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1. What is a tornado?
2. When are tornadoes most likely?
3. Where do tornadoes occur?
4. How do tornadoes form?
5. What is straight-line wind?
6. What is a downburst?
7. How many tornadoes occur in the U.S. each year?