The rising threat of notably strong tornadoes has prompted the highest severe thunderstorm risk in months to be issued in parts of the Midwest. It's all part of a more widespread potential outbreak of powerful storms across the Central US on Tuesday as a new storm system develops and strengthens over the region. A Level 4 of 5 risk of severe thunderstorms is in place for more than 2 million people in northern Illinois and northwest Indiana, including Peoria and Bloomington, Illinois.