* WHAT. Flooding caused by excessive rainfall is expected. * WHERE. A portion of south central Illinois, including the following counties, Bond, Clinton, Marion and Washington. * WHEN. Until 230 AM CDT. * IMPACTS. Flooding in low-lying and poor drainage areas. Water over roadways. Some low-water crossings may become impassable. * ADDITIONAL DETAILS. - At 1032 PM CDT, Doppler radar indicated the heaviest rain is ending, however light to moderate rain is continuing. Radar estimates that Between 2 and 4 inches of rain have fallen in the advisory area. - Flooding impacts will continue even though the heaviest rain is ending. Please continue to use caution tonight, especially while driving. - Some locations that will experience flooding include. Centralia, Salem, Greenville, Breese, New Baden, Carlyle, Nashville, Trenton, Aviston, Okawville, St. Rose, Sandoval, Germantown, Albers, Wamac, Central City, Odin, Beckemeyer, Kinmundy and Pocahontas.