* WHAT. For the Coastal Flood Advisory, up to one half foot of inundation above ground level in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, up to one foot of inundation above ground level possible in low-lying areas near shorelines and tidal waterways. * WHERE. Westmoreland and Northumberland Counties. * WHEN. For the Coastal Flood Advisory, until 8 AM EDT Saturday. For the Coastal Flood Watch, from Saturday afternoon through late Saturday night. * IMPACTS. Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. Some shoreline erosion may occur. * ADDITIONAL DETAILS. Additional flooding is likely Sunday through Monday.

* WHAT. For the Coastal Flood Advisory, up to one half foot of inundation above ground level in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, up to one foot of inundation above ground level possible in low-lying areas near shorelines and tidal waterways. * WHERE. Westmoreland and Northumberland Counties. * WHEN. For the Coastal Flood Advisory, until 8 AM EDT Saturday. For the Coastal Flood Watch, from Saturday afternoon through late Saturday night. * IMPACTS. Some roads may be closed. Low lying property including homes, businesses, and some critical infrastructure may be inundated. * ADDITIONAL DETAILS. Additional flooding is likely Sunday through Monday.

* WHAT. Visibility less than one quarter mile in dense fog. * WHERE. Portions of northwest and western Virginia and eastern West Virginia, especially along the river valleys. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. One to two feet of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in the District of Columbia, Arlington County, and the City of Alexandria. * WHEN. Until 2 AM EDT Sunday, especially around the time of high tide. * IMPACTS. Shoreline inundation is expected along portions of the seawall adjacent to Ohio Drive and the Hains Point Loop Road and near the Tidal Basin. Water is expected to approach the curb near the intersection of King Street and Strand Street in Alexandria. * ADDITIONAL DETAILS. Tides one and a half to two feet above normal. The next high tides at Alexandria are 10:35 AM and 10:52 PM. The next high tides at Washington Channel are 10:17 AM and 10:34 PM.

* WHAT. Up to one foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in Charles and King George Counties. * WHEN. Until 8 AM EDT Sunday, especially around the time of high tide. * IMPACTS. At 3.5 feet, water reaches yards near Cobb Island and docks near Dahlgren. * ADDITIONAL DETAILS. Tides one and a half to two feet above normal. The next high tides at Indian Head are 10:03 AM and 10:20 PM. The next high tides at Goose Bay are 6:09 AM and 6:26 PM. The next high tides at Dahlgren are 4:59 AM and 5:25 PM.

* WHAT. Up to one foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. St. Marys and Calvert Counties. * WHEN. Until 11 AM EDT Sunday, especially around the time of high tide. * IMPACTS. At 3.0 feet, water is expected to reach backyards near 9th Street in North Beach, and could approach 9th Street. At 3.5 feet, water covers roads on Saint George Island, is in yards, and is approaching structures. To the east, inundation is occurring at multiple marinas off St. Mary's River, Smith Creek, and Jutland Creek. At 3.5 feet, yards are flooded near Charles Street and Williams Street in Solomons. Nearby parking lots and the streets themselves are covered by more than a half foot of water. * ADDITIONAL DETAILS. Tides one and a half to two feet above normal. The next high tides at Solomons Island are 4:06 AM and 4:42 PM. The next high tides at Chesapeake Beach are 5:54 AM and 6:43 PM. The next high tides at Coltons Point are 4:59 AM and 5:16 PM. The next high tides at Point Lookout are 4:02 PM and 3:58 AM. The next high tides at Piney Point are 4:23 AM and 4:40 PM.

* WHAT. For the Coastal Flood Advisory, up to one half foot of inundation above ground level in low lying areas due to tidal flooding. For the Coastal Flood Watch, up to one foot of inundation above ground level possible in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. For the Coastal Flood Advisory, until 6 PM EDT Saturday, especially around the time of high tide. For the Coastal Flood Watch, from Saturday evening through late Saturday night, especially around the time of high tide. * IMPACTS. At 3.5 feet, water reaches the floor of the Maritime Museum in Annapolis, begins to cover Bowyer Road on the Naval Academy campus, and numerous businesses on Dock Street are flooded, along with the City Dock parking lot. Bayside Beach begins to flood around Harbor Rd and Lake Dr. * ADDITIONAL DETAILS. Tides one and a half to two feet above normal. The next high tides at Annapolis U.S. Naval Academy are 7:09 AM and 8:10 PM.