Preliminary data from the National Weather Service show that more than 600 twisters have touched down in April, smashing the existing record of 267 set in 1974.
The outbreak — the deadliest in nearly 40 years — that devastated large swaths of north central Alabama and other southern states appears to follow a historic pattern. Over the decades, the annual number of tornadoes occurring in the U.S. has climbed — from a low of 201 in 1950 to a record high of 1,817 in 2004. Last year's total was 1,525.
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