FFWLSX The National Weather Service in St Louis has issued a * Flash Flood Warning for. Southern Madison County in southwestern Illinois. Northwestern Monroe County in southwestern Illinois. Northwestern Saint Clair County in southwestern Illinois. Saint Louis County in east central Missouri. Saint Louis City in east central Missouri. * Until 545 AM CST. * At 239 AM CST, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 2 to 3 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD. Flash flooding caused by thunderstorms. SOURCE. Radar indicated. IMPACT. Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include. St. Louis, St. Charles, Florissant, Chesterfield, Belleville, Wildwood, University City, Ballwin, Granite City, O'Fallon, Kirkwood, Maryland Heights, East St. Louis, Hazelwood, Collinsville, Edwardsville, Webster Groves, Ferguson, Arnold and Manchester. This includes the following State Parks. Babler Memorial State Park, Scott Joplin Historic Site, Route 66 State Park, Castlewood State Park and Horseshoe Lake State Park. This includes the following highways. Interstate 64 in Illinois between exits 9 and 14. Interstate 55 in Illinois near exit 23. Interstate 70 in Illinois between exits 21 and 24. Interstate 70 in Missouri near exit 231. Interstate 44 in Missouri between exits 261 and 277.