The first anniversary of the deadly Joplin, Mo., tornado is May 22, 2012. Here's a look at the 10 deadliest tornadoes in U.S. history, according to the NOAA.
6. Woodward, Okla. (1947) -- More than 900 people in Kansas, Oklahoma and Texas were injured by this EF5 twister, which left 181 dead.
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