Weekend thunderstorms that rolled through large swaths of the Midwest are expected to give way to a blistering hot and sticky week. "It's going to feel the most uncomfortable it's felt all summer," Kevin Donofrio, a National Weather Service meteorologist in suburban Chicago, said of the expected heat wave. Temperatures in Chicago and stretching into Iowa and up into Wisconsin are expected to reach 90 degrees by Thursday or Friday, with the same story - though perhaps a bit warmer - anticipated in Minnesota.