A flash flood watch has been extended by the National Weather Service to include most of southern West Virginia and Southwest Virginia, including Mercer, Tazewell, Bland, Giles, McDowell and Buchanan counties.
According to the National Weather Service in Blacksburg, Va., a very moist atmosphere combined with strong daytime heating will cause more showers and thunderstorms to develop this afternoon and evening. The rainfall has the potential to be very heavy at times with an inch or more accumulation possible within a hour.
Some of the heavy rain will occur over locations where soils are already saturated from rounds of heavy rain that has occurred over the past few days, according to forecasters. So any new rainfall may convert directly into runoff causing streams and drainages to rise very quickly.
The flash flood watch remains in effect through this evening.