apr 30, 2011 - One of the worst U.S. tornado seasons.

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In one of the worst U.S. tornado seasons, 137 reported tornadoes sweep through the south, killing nearly 300 people in six states. Most of the fatalities occur in Alabama. May 22: At least 140 people are killed and hundreds more injured as a three-quarter-mile-wide tornado hits Joplin, Missouri. The tornado is among the deadliest in the nation's history, destroying nearly a third of the city and damaging about 2,000 buildings, including water treatment and sewage plants.

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