are very destructive
The picture above is a picture of an F5 Before and after aftermath.
The united states has the most(3/4) tornadoes out of the whole world. Also the U.S. has an average of 800 tornadoes per year.
Every year about 100 tornadoes get to the ground in the U.S.Most people who live in tornado alley have very strong basement shelters. Forks and knives have been found lodged in tree trunks from a tornado.
Pictures from images.google.com
Info from Tornado-Facts.com