WPC has the area in a slight risk for excessive rain day 3.
From Mount Holly-
Hazards: The longer the front stalls or at least slows, the longer our region will be in southerly return flow (resulting in low level moisture advection). Consequently, precipitable water values of 1.5 to 2 inches will be possible, especially over the coastal plains. The 90th percentile of pwat at IAD for late September is about 1.5 inches, so needless to say if this happens, pwats will be well above normal. Additionally the warm cloud layer will likely be very deep for late September. Also, low and mid level flow could be close to parallel of the front, which could increase the threat for training storms/showers. Therefore, will mention the potential for heavy rain in the HWO. However, have chosen to hold off on a flash flood watch at this point given the poor run to run consistency we have seen so far, especially with the timing of the front (timing will be key to the threat for heavy rain).