This follows from research by NASA's Goddard Space Flight Center that found rainfall in that same area of the country rose during the week. The suspected culprit is automobile pollution, which is causing more storms during the week and increasing the severity of storms. That pollution, and the humid air in the southeast, makes for more clouds to rise and create more conditions for lightning strikes. It's just another step closer to the apocalypse, and we don't doubt that they'll soon be telling us cars cause cancer. Oh, wait... Thanks for the tip, Corey!
[Source: Scientific American via The College Driver]