Heavy rain is plaguing the Plains and Midwest this week, prompting flash flood threats through Thursday morning—a scene the region is all too familiar with this year. FLASH FLOODING POSSIBLE AS UNSTABLE ATMOSPHERE FUELS SEVERE THUNDERSTORMS IN THE SOUTHEASTWhile showers began on Tuesday, a more heightened flood threat is building into Wednesday as rain coverage increases. Tracking the flood threat across the Midwest. Flash flood threat outlook. (FOX Weather)As additional rain develops across many of the same areas, a Level 2 out of 4 flash flood risk is in place, including Chicago, St. Louis and Kansas City.