* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of central, east central, southeast, and southern Oklahoma, including the following counties, in central Oklahoma, Canadian, Cleveland, Grady, Lincoln, McClain, Oklahoma and Pottawatomie. In east central Oklahoma, Pontotoc and Seminole. In southeast Oklahoma, Atoka, Coal, Hughes and Johnston. In southern Oklahoma, Garvin, Murray and Stephens. * WHEN...Through Wednesday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Multiple rounds of thunderstorms with heavy rainfall are possible this afternoon, evening and into Wednesday morning. - http://www.weather.gov/safety/flood