What was the worst tornado in the us in 2011?

By far the worst tornado to hit the U.S. in 2011 was the Joplin, Missouri tornado of May 22. This tornado was rated EF5, the highest level of tornado intensity. 30% of the city of Joplin was destroyed. In total the tornado killed 158 people (in addition to several indirect deaths), injured over 1,100 , caused $2.8 billion in damage, and destroyed nearly 7,000 homes. This makes it the costliest and 7th deadliest tornado in U.S. history.