A more than 1,200-mile corridor from Wisconsin to Texas could see severe weather beginning Friday afternoon, with more than 7 million people under the greatest risk of seeing large hail across Iowa and other parts of the Midwest and Central Plains. Supercell thunderstorms are expected to develop during the early evening and into the overnight, and could produce “monster” hail 3 inches in diameter, as well as tornadoes. The multiday threat began on Thursday when numerous Severe Thunderstorm Warnings were issued across the Texas and Oklahoma Panhandles, with wind gusts of 70 mph reported. A video on social media showed cloud-to-ground lightning during severe storms in southern Kansas. While a layer of warm air in the atmosphere has the potential to limit afternoon storms on Friday, supercell thunderstorms are expected to break through that “atmospheric cap” by the evening.…