As the nation’s capital braces for a bout of overcast skies and calm breezes, D.C. residents are advised to keep an eye on coastal waters. The National Weather Service (NWS) is alerting the public to an extended Coastal Flood Advisory now in effect until noon EDT Friday. The advisory forecasts up to one foot of inundation above ground level in low-lying areas due to tidal flooding, affecting shores along the District of Columbia.