What makes conditions right for a tornado?

Related questions

1. What state has never had a tornado?
2. What state is Tornado Alley in?
3. Can Tornadoes be invisible?
4. Does it rain in a tornado?
5. What stops a tornado?
6. How does a tornado kill you?
7. What is the difference between a funnel cloud and a tornado?
8. Is a tornado a cloud?
9. Are squalls dangerous?
10. Can thunder shake a house?

Tags

1. #usual
2. #humid
3. #lower
4. #cooler
5. #causes
6. #shear
7. #unusually
8. #tornadoes
9. #instability
10. #atmosphere
11. #conditions
12. #refers
13. #possibly
14. #thunderstorms
15. #there
16. #violent
17. #sufficient
18. #present
19. #upper