Rainy weather in the upcoming days has prompted the National Weather Service in Columbia to issue a flash flood watch until Thursday morning for 18 of the state’s central counties including Lancaster. A flash flood watch means that conditions may develop that lead to flash flooding. Other counties in the watch area include Aiken, Bamberg, Barnwell, Calhoun, Chesterfield, Clarendon, Edgefield, Fairfield, Kershaw, Lee, Lexington, McCormick, Newberry, Orangeburg, Richland, Saluda, and Sumter.