A flash flood watch remains in effect through Thursday for much of southern Illinois and Missouri as another two to four inches of rain were expected to fall, according to the National Weather Service in St. Louis.
A combination of new rainfall on saturated soils will result in more runoff. This runoff could result in widespread flooding and may also cause flash flooding.
The National Weather Service in St Louis has extended the flood warning until 9 a.m. Friday for several southern Illinois counties, including Monroe County, northern Randolph County, St. Clair County, south central Calhoun County, Clinton County, Washington County and Madison County.
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Some locations that will experience flooding include St. Louis, St. Charles, St. Peters, Florissant, Chesterfield, Belleville, Wildwood, University City, Ballwin, Granite City, Wentzville, O`Fallon, Alton, Kirkwood, Maryland Heights, East St. Louis, Hazelwood, Collinsville, Edwardsville and Webster Groves.
The forecast for the metro-east from the National Weather Service:
Today ... Showers likely, mainly after 7 a.m. Cloudy, with a high near 53. East wind 7 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 70 percent.
Tonight ... Showers. The rain could be heavy at times. Low around 48. Northeast wind 15 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 90 percent.
Thursday ... Rain. High near 52. North wind 14 to 16 mph, with gusts as high as 32 mph. Chance of precipitation is 80 percent.
Thursday Night ... Rain likely, mainly before 1 a.m. Mostly cloudy, with a low around 46. North wind around 16 mph, with gusts as high as 33 mph. Chance of precipitation is 60 percent.
Friday ... Mostly sunny, with a high near 63. North wind around 16 mph, with gusts as high as 31 mph.
Friday Night ... Mostly clear, with a low around 47.
Saturday ... Mostly sunny, with a high near 71.
Saturday Night ... Mostly clear, with a low around 48.
Sunday ... Sunny, with a high near 70.
Sunday Night ... Mostly clear, with a low around 49.
Monday .... Mostly sunny, with a high near 72.
Monday Night ... Partly cloudy, with a low around 54.
Tuesday ... Mostly sunny, with a high near 76.