* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of southwest North Carolina, including the following areas, Cherokee and Clay, East Tennessee, including the following areas, Anderson, Bledsoe, Blount Smoky Mountains, Bradley, Campbell, Claiborne, Cocke Smoky Mountains, East Polk, Grainger, Hamblen, Hamilton, Hancock, Hawkins, Jefferson, Johnson, Knox, Loudon, Marion, McMinn, Meigs, Morgan, North Sevier, Northwest Blount, Northwest Carter, Northwest Cocke, Northwest Greene, Northwest Monroe, Rhea, Roane, Scott TN, Sequatchie, Sevier Smoky Mountains, Southeast Carter, Southeast Greene, Southeast Monroe, Sullivan, Unicoi, Union, Washington TN and West Polk, and southwest Virginia, including the following areas, Lee, Russell, Scott VA, Washington VA and Wise. * WHEN...Through late tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Periods of showers and thunderstorms are expected today and into tonight. Locations that receive multiple rounds of locally heavy rainfall could experience instances of flash flooding. While flooding could occur at any time, the flooding potential is now expected to be greatest this morning through tonight. Locations that have already seen flooding need less rainfall to have additional flooding and should take new storms seriously. - http://www.weather.gov/safety/flood