* WHAT. One to two feet of inundation above ground level in low- lying areas near shorelines and tidal waterways. * WHERE. Westmoreland and Northumberland Counties. * WHEN. Until midnight EDT tonight. * IMPACTS. Widespread flooding of vulnerable areas will result in an elevated threat of property damage to homes and businesses near the waterfront and shoreline. Water will be 1 to 2 feet above ground level in some areas resulting in a sufficient depth to close numerous roads and threaten homes and businesses. Flooding will extend inland from the waterfront along tidal rivers and bays resulting in some road closures and flooding of vehicles.

* WHAT. Up 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 4 AM EDT Wednesday, especially around the time of high tide. * IMPACTS. The unprotected area on the Southwest Waterfront at the DC Seafood Market is expected to flood. Water is expected to approach parts of the Hains Point Loop Road, but it will likely be closed. Water is expected to approach buildings near King Street and Union Street in Alexandria. * ADDITIONAL DETAILS. Tides two to two and a half feet above normal. The next high tide at Washington Channel is at 2:00 PM and 2:16 AM. The next high tide at Alexandria is at 2:18 PM and 2:34 AM.

* WHAT. Up to two feet of inundation above ground level in low- lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. Until 4 AM EDT Wednesday, 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 two to two and a half feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 10:24 AM and 12:16 AM.

* WHAT. Up to two feet of inundation above ground level in low- lying areas due to tidal flooding. * WHERE. Shoreline in Saint Mary's County. * WHEN. Until 10 PM EDT this evening, especially around the time of high tide. * IMPACTS. 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 Saint Mary's River, Smith Creek, and Jutland Creek. * ADDITIONAL DETAILS. Tides two and a half to three feet above normal. The next high tide at Point Lookout is at 6:40 AM and 7:54 PM. The next high tide at Piney Point is at 8:06 AM and 8:22 PM. The next high tide at Coltons Point is at 8:42 AM and 8:58 PM.

* WHAT. Up to one foot of inundation above ground level in low- lying areas due to tidal flooding. * WHERE. Shoreline in Calvert County. * WHEN. Until noon EDT Wednesday, 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, 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 two to two and a half feet above normal. The next high tide at Solomons Island is at 7:40 AM and 8:46 PM. The next high tide at Chesapeake Beach is at 9:21 AM and 10:35 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 noon EDT Wednesday, 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 two to two and a half feet above normal. The next high tide at Dahlgren is at 8:36 AM and 9:13 PM. The next high tide at Goose Bay is at 9:52 AM and 10:08 PM. The next high tide at Indian Head is at 1:46 PM and 2:02 AM.

* WHAT. Southeast winds 10 to 15 kt with gusts up to 20 kt expected. * WHERE. Chesapeake Bay and adjoining estuaries north of Smith Point VA, and Tidal Potomac from Cobb Island MD to Smith Point VA. * WHEN. From 4 PM this afternoon to 3 AM EDT Wednesday. * IMPACTS. Conditions will be hazardous to small craft.