Deadly tornadoes reveal new disaster patterns in the Southeast

The “outbreak” rate across the U.S. has increased since the 1970s.

A weather satellite image of the March 3 tornadoes in Tennessee
A weather satellite picked up on the string of violent tornadoes that blew through Tennessee early last week.NOAA

Overall, the number of annual twisters around the country appears stable—it’s their clustering patterns that are changing to consequence.
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