* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of the Shenandoah Valley, Central Virginia Piedmont, West Virginia Panhandle, and Northern Maryland * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Up to one half foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. Until 9 AM EDT this morning, especially around the time of high tide. * IMPACTS. At 3.0 feet, Compromise Street begins to flood in Annapolis. Flooding of much of the City Dock parking lot is occurring. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 4:28 AM.

* WHAT. Up to one foot of inundation above ground level expected in low lying areas due to tidal flooding. * WHERE. Shoreline in the District of Columbia. * WHEN. Until 9 AM EDT this morning, 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 and Jefferson Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Washington Channel is at 7:01 AM.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of the Shenandoah Valley, Central Virginia Piedmont, West Virginia Panhandle, and Northern Maryland. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. In Maryland, Anne Arundel, Central and Southeast Howard, Northwest Howard, Northwest Montgomery, and Southern Baltimore Counties. In Virginia, Northern Fauquier and Western Loudoun Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of the Shenandoah Valley, Central Virginia Piedmont, West Virginia Panhandle, and Northern Maryland. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. In Maryland, Anne Arundel, Central and Southeast Howard, Northwest Howard, Northwest Montgomery, and Southern Baltimore Counties. In Virginia, Northern Fauquier and Western Loudoun Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

Areas of fog remain across the Virginia piedmont early this morning, and will persist through around 8 am EDT, with improving conditions thereafter. Visibilities will average between one half mile and two miles, but will be locally reduced to one quarter mile at times, especially over low lying locations. Motorists should be alert for sudden changes in visibility due to the areas of dense fog. Drive at reduced speeds and use low beam headlights only.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Spotsylvania and Stafford Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. In Maryland, Anne Arundel, Central and Southeast Howard, Northwest Howard, Northwest Montgomery, and Southern Baltimore Counties. In Virginia, Northern Fauquier and Western Loudoun Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of the Shenandoah Valley, Central Virginia Piedmont, West Virginia Panhandle, and Northern Maryland. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility could make driving conditions hazardous.

* WHAT. Up to one half foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in the City of Alexandria and Arlington County. * WHEN. Until 9 AM EDT this morning, especially around the time of high tide. * IMPACTS. Water is expected to approach the curb near the intersection of King Street and Strand Street in Alexandria. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Alexandria is at 7:19 AM.

* WHAT. Up to one foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in the District of Columbia. * WHEN. Until 9 AM EDT this morning, 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 and Jefferson Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Washington Channel is at 7:01 AM.

* WHAT. Up to one half foot of inundation above ground level in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. Until 9 AM EDT this morning, especially around the time of high tide. * IMPACTS. At 2.8 feet, flooding of some of the parking area near Dock Street in Annapolis may occur, with water surrounding the Alex Haley Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 4:30 PM.