Expires:202411220900;;448234 FZUS51 KLWX 212335 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 635 PM EST Thu Nov 21 2024 Tidal Potomac River and Maryland portion of Chesapeake Bay. Forecasts of wave heights do not include effects of wind direction relative to tidal currents. Expect higher waves when winds are blowing against the tidal flow. ANZ500-220900- 635 PM EST Thu Nov 21 2024 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... Low pressure will loop counterclockwise over the northern Mid- Atlantic through Friday night, then depart toward New England and the Canadian Maritimes this weekend. High pressure will briefly build across the area late in the weekend, then another frontal system will likely approach early next week. Small Craft Advisories will likely be needed through Sunday. $$