* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Southwestern Delaware County in central Ohio... Franklin County in central Ohio... Northeastern Madison County in central Ohio... Southern Union County in central Ohio... * WHEN...Until 315 PM EDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 1219 PM EDT, radar and automated rain gauges indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2 inches of rain have fallen. Additional rainfall amounts of 1 to 1.5 inches are possible. - Some locations that may experience flooding include... Columbus, Dublin, Westerville, Reynoldsburg, Grove City, Upper Arlington, Gahanna, Hilliard, Marysville, Worthington, Bexley, Powell, Groveport, Plain City, Minerva Park, New California, Lake Darby and Ohio State University.