* WHAT. Flash flooding caused by excessive rainfall is possible. * WHERE. The following counties, in southeast Indiana, Dearborn, Franklin, Ohio, Ripley and Switzerland, the following counties, in Kentucky, Boone, Bracken, Campbell, Carroll, Gallatin, Grant, Kenton, Lewis, Mason, Owen, Pendleton and Robertson, and the following counties, in Ohio, Adams, Brown, Butler, Clermont, Clinton, Fairfield, Fayette, Franklin, Greene, Hamilton, Highland, Hocking, Licking, Madison, Pickaway, Pike, Ross, Scioto and Warren. * WHEN. From noon EDT today through Wednesday evening. * IMPACTS. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS. - Several rounds of heavy rain will move across the same area.