* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of southern Illinois, including the following areas, Alexander, Gallatin, Hardin, Johnson, Massac, Pope, Pulaski, Saline, Union, White and Williamson, southwest Indiana, including the following areas, Gibson, Pike, Posey, Spencer, Vanderburgh and Warrick, and western Kentucky, including the following areas, Henderson and Union KY. * WHEN...Through Wednesday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Additional heavy rainfall amounts of 1.5 to 3 inches, perhaps localized higher are possible. This may fall on areas that already received over 1.5" over the past 24 hours. - http://www.weather.gov/safety/flood