What is a tornado?

A tornado is a column of violently rotating winds extending down from a thunderstorm cloud and touching the surface of the earth.

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1. What is a severe thunderstorm?
2. What is a tornado?
3. What is the difference between a tornado and a funnel cloud?
4. How many tornadoes usually occur in Michigan every year?
5. When do tornadoes generally occur?
6. How fast do tornadoes travel?
7. How far do tornadoes travel once they touch the ground?
8. When is a tornado or severe thunderstorm watch issued?
9. When is a tornado or severe thunderstorm warning issued?
10. What is a special marine warning?
11. How do I find out about a warning if my electricity is already out?