The 2011 Super Outbreak was the most prolific tornado outbreak in USA history. It produced 362 tornadoes, with 218 of those in a single 24-hour period on April 27, including 11 EF4 and 4 EF5 tornadoes. 348 deaths occurred in that outbreak, of which 324 were tornado related. The outbreak helped smash the record for most tornadoes in the month of April with 772 tornadoes, almost triple the prior record (267 in April 1974). The overall record for a single month was 542 in May 2003, which was also broken.
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