Scattered showers and thunderstorms are expected along a quasi-stationary frontal boundary lingering across the coastal Mid-Atlantic and Carolinas, southwest through Georgia, and into the southern Appalachians. Locally heavy rainfall and some isolated instances of flash flooding will be possible. A focus of greater moisture and instability along the southern Appalachians will bring the threat of some more intense downpours and a greater risk of scattered flash flooding given the more complex terrain, and a Slight Risk of Excessive Rainfall has been issued.