The threat of flash flooding on Sunday afternoon was focused over parts of the Midwest, where flood watches have been posted from Missouri to West Virginia, including the cities of Indianapolis and Cincinnati. Rounds of heavy rain and thunderstorms are forecast to sweep across the Midwest region over the next 24 hours.

St. Louis tackles summer weather extremes with flash floods and intense heatwave warnings from the National Weather Service.

A flood watch began at 3 p.m. and runs until 3 a.m. in the following 11 counties: Salem, Gloucester, Camden, northwestern Burlington, Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and Warren.