What are the signs that a tornado might form?

Related questions

1. Can tornadoes jump?
2. Does the sky turn green before a tornado?
3. What is Python tornado?
4. Is a dust devil a tornado?
5. Do tornadoes have names?
6. Can 2 tornadoes join together?
7. Can Tornadoes be predicted?
8. Do you open doors during a tornado?
9. Is it safe under stairs during a tornado?
10. Can a tornado turn into a hurricane?

Tags

1. #greenish
2. #warning
3. #arrival
4. #approaching
5. #tornado
6. #precipitate
7. #clouds
8. #signs
9. #atmospheric
10. #there
11. #absence
12. #several
13. #debris
14. #large
15. #often
16. #cloud