Area Forecast Discussion
Issued by NWS Sterling, VA

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508 FXUS61 KLWX 170755 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 355 AM EDT Tue Sep 17 2019 .SYNOPSIS... High pressure will build across the Northeast U.S. through the end of the week and into the weekend. && .NEAR TERM /THROUGH TONIGHT/... A nearby weak front could spawn a shower or two in spots today. Otherwise, expect high pressure to build in from the northwest today and tonight. Winds will be generally light with dry weather. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... High pressure will remain in control through the period. Dry conditions with light northeast winds, becoming more variable as the high pressure settles overhead. Dry conditions and cool temperatures in the 70s during the day, followed by temperatures in the 50s at night. && .LONG TERM /FRIDAY THROUGH MONDAY/... Surface high pressure will slowly ease off the coast through the extended portion of the forecast, as ridging remains in place aloft. This setup will promote a warming trend as well as increases in humidity (dewpoints rising from upper 40s/lower 50s to above 60). But the forecast will remain rain-free until perhaps Monday, when an approaching cold front could perhaps support shower (thunderstorm?) activity. PoPs (20-30%) will be focused on the Potomac Highlands at this time. && .AVIATION /08Z TUESDAY THROUGH SATURDAY/... VFR conditions expected this week under high pressure. Winds will be 10 kt or less...from the northeast today, becoming south by Thursday. && .MARINE... Small Craft Advisories are in effect for most of the Chesapeake Bay and Tidal Potomac through this afternoon. The Small Craft will be extended into tonight for the lower tidal Potomac/Bay Drum Point-Smith Point/Tangier Sound. Guidance suggesting 15-20 kt winds will be lingering there. Momentum transfer profiles will be favorable with mid-upper 70 degree water and air temps in the 60s. Small Craft Advisories may need to be extended through Wednesday. Winds should be light Thursday through the end of the week under high pressure. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...Small Craft Advisory until noon EDT today for ANZ531>533- 538>542. Small Craft Advisory until 6 AM EDT Wednesday for ANZ534-537- 543. && $$ SYNOPSIS...KLW NEAR TERM...KLW SHORT TERM...KLW LONG TERM...HTS AVIATION...HTS/KLW MARINE...HTS/KLW is the U.S. government's official web portal to all federal, state and local government web resources and services.