Technically, on average, every state is affected by at least 1 tornado every year. But here is the list of the top 16 states affected by tornadoes (on average)
1. Texas
2. Oklahoma
3. Kansas
4. Nebraska
5. Missouri
6. Alabama
7. South Dakota
8. Florida
9. Illinois
10. Minnesota
11. Wisconsin
12. Michigan
13. North Dakota
14. New York
15. Georgia
16. South Carolina
The Yazoo City tornado of 2010 affected two states: Louisiana and Mississippi.
Many more than six states were hit, and it was not a single tornado but many. Texas, Arkansas, Louisiana, Mississippi, Alabama, Tennessee, Georgia, South Carolina, Kentucky, and possibly other southern states were affected. Several northern states have been affected as well.
Yes. Tornado warnings are commonplace in the United States, with an average lead time of 14 minutes.
Yes. Iowa is one of the most tornado prone states in the U.S. Several of Iowa's tornadoes have been violent enough to be rated F5.
Tornado Alley in the central United States suffers the greatest amount of damage from tornadoes.
Earth
As of June 14, 2012, the last cofnriemd tornado in the United States was three days ago on June 11.
the ones outside
everything in it's way
Yes. Hamtramck Michigan was affected by an F2 tornado on July 2, 1997
The tornado keeps going without being affected.
Tornadoes are not named, and hundreds of tornadoes affect the United States every year. It would be impossible to list them all.