America will probably get more killer tornado- and hail-spawning supercells as the world warms, according to a new study that also warns that the lethal storms will edge eastward to strike more frequently in the more populous Southern states, like Alabama, Mississippi, and Tennessee.

The supercell storm that devastated Rolling Fork, Miss., is a single event that can’t be connected to climate change. But it fits that projected and more dangerous pattern, including more nighttime strikes in a southern region with more people, poverty, and vulnerable housing than where storms hit last century.

The study in the Bulletin of the American Meteorological Society predicts a nationwide 6.6 percent increase in supercells and a 25.8 percent jump in the area and time the strongest supercells twist and tear over land under a scenario of moderate levels of future warming by the end of the century.

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