* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of central Pennsylvania, including the following areas, Bedford, Blair, Cambria, Cameron, Clearfield, Elk, McKean, Northern Centre, Northern Clinton, Potter, Somerset and Warren. * WHEN...Until 2 AM EDT Monday. * 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... - Scattered to numerous heavy showers and isolated thunderstorms are expected into tonight. Efficient rainfall rates of up to 1.50 inches per hour along with repeat rounds of rain could result in flash flooding across the area. - http://www.weather.gov/safety/flood