What causes a tornado?

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Tags

1. #humid
2. #pushed
3. #already
4. #thunderstorms
5. #large
6. #usually
7. #rotation
8. #colder
9. #producing
10. #tornadoes
11. #collides
12. #denser
13. #causing
14. #updraft
15. #supercells
16. #through
17. #rises
18. #winds
19. #violent