Why Tornado Alley exists?

Related questions

1. Why is thunder so loud?
2. Why is thunder loud?
3. Can a thunderstorm cause a tornado?
4. Can thunder shake a house?
5. Does it get calm before a tornado?
6. Can there be a tornado without rain?
7. What is tornado season?
8. What state is Tornado Alley in?
9. Where is Tornado Alley?
10. What are weather squalls?

Tags

1. #tropical
2. #between
3. #canada
4. #allows
5. #which
6. #plains
7. #alley
8. #relatively
9. #called
10. #tornadoes
11. #tornado
12. #airmasses
13. #polar
14. #moist
15. #mexico
16. #great
17. #front
18. #along
19. #states
20. #united