* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of southeast Ohio, including the following counties, Athens, Gallia, Jackson OH, Lawrence OH, Meigs, Morgan, Perry, Vinton and Washington and West Virginia, including the following counties, Barbour, Boone, Braxton, Cabell, Calhoun, Clay, Doddridge, Gilmer, Harrison, Jackson WV, Kanawha, Lewis, Lincoln, Mason, Northwest Fayette, Northwest Nicholas, Northwest Pocahontas, Northwest Randolph, Northwest Webster, Pleasants, Putnam, Ritchie, Roane, Southeast Fayette, Southeast Nicholas, Southeast Pocahontas, Southeast Randolph, Southeast Webster, Taylor, Tyler, Upshur, Wirt and Wood. * WHEN...From 8 PM EDT this evening through Monday morning. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. * ADDITIONAL DETAILS... - Additional rounds of heavy showers and storms are expected to move through the area this evening through Monday morning. Locations that received heavy rain earlier in the day will be at greatest risk for additional flash flooding overnight. - http://www.weather.gov/safety/flood