Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
475 FXUS61 KLWX 280117 AFDLWX Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 917 PM EDT Tue Jun 27 2017 .SYNOPSIS... High pressure will build over the area late tonight and Wednesday before moving offshore Thursday. Warm conditions expected towards the end of the week and through the weekend. && .NEAR TERM /THROUGH WEDNESDAY/... A surface trough remains near the Chesapeake Bay this evening. Scattered showers and thunderstorms are possible mainly across far southern MD and surrounding waters for the rest of the evening. Northerly flow will continue to move into the Mid- Atlantic region tonight as high pressure moves eastward. Dry conditions expected through Wednesday. A cool night expected across the region tonight with temps ranging from the 40s in the mtns to the U50s by the Chesapeake Bay and Tidal Potomac River. High pressure will move overhead Wednesday and calm and clear conditions are expected. Wednesday will be the last day of the cooler than normal stretch of temperatures with temps only reaching the U70s/L80s. High pressure will move off the coast by Wednesday evening and winds will become southerly by late Wed afternoon. && .SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/... A significant warming trend is expected Thu and Fri as high pressure remains offshore. && .LONG TERM /FRIDAY THROUGH TUESDAY/... As high pressure moves over the western Atlantic, warmer temperatures and increasing chances of showers and thunderstorms will develop Friday through Sunday. The best chance for showers and storms will be Saturday and Sunday. A second area of high pressure will build into the region Monday and Tuesday, bringing more seasonable temperatures and dry conditions. && .AVIATION /01Z WEDNESDAY THROUGH SUNDAY/... VFR conditions through Sat night. Risk of showers and thunderstorms on Sunday. && .MARINE... A pressure surge is expected tonight with SCA conditions expected through the night. Strong srly winds expected Wed night and Thu. SCAs have been issued for Wed night. No marine hazards expected Friday through Saturday night. Winds southwest around 10 knots. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...Small Craft Advisory until 6 AM EDT Wednesday for ANZ530>533- 538>542. Small Craft Advisory from 9 PM Wednesday to 6 AM EDT Thursday for ANZ530>534-536>543. Small Craft Advisory until 8 AM EDT Wednesday for ANZ534-537- 543. && $$ SYNOPSIS...LFR NEAR TERM...HSK SHORT TERM...LFR LONG TERM...KLW AVIATION...HSK/LFR/KLW MARINE...HSK/LFR/KLW

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.