* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central Pennsylvania, including the following counties, Adams, Bedford, Blair, Cambria, Cumberland, Dauphin, Franklin, Fulton, Huntingdon, Juniata, Lancaster, Lebanon, Mifflin, Perry, Somerset and York. * WHEN...Until midnight EDT 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... - Thunderstorms will move southward through the area this evening. Some are producing heavy rainfall and could make flooding. - http://www.weather.gov/safety/flood