They see double-digit percentage point drops in June and July.In the mid-South, including Rolling Fork, the study projects supercell activity peaking two hours later, from 6 to 9 p.m. instead of 4 to 7 p.m. That means more nighttime supercells.If you want a disaster, create a supercell at night where you cant go outside and visually confirm the threat so people dont take it as seriously, Gensini said.The eastward shift also puts more people at risk because those areas are more densely populated than the traditional tornado alley of Kansas and Oklahoma, Ashley and Gensini said.