The National Weather Service Baltimore-Washington states high pressure is building across the southeast U.S., with a cold front approaching from the Northeast and Great Lakes. This front will move south on Friday, and high pressure is expected to dominate the Mid-Atlantic weather through early next week. Patchy, dense river fog may cause visibility issues for motorists near larger waterways until just after daybreak, and areas near or below freezing could experience patchy slick spots, especially on elevated and untreated surfaces.