Area Forecast Discussion
Issued by NWS Sterling, VA

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000 FXUS61 KLWX 260022 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 822 PM EDT THU SEP 25 2014 .SYNOPSIS... COASTAL LOW PRESSURE WILL SLOWLY MOVE OUT TO SEA TONIGHT. GREAT LAKES HIGH PRESSURE WILL SLOWLY BUILD INTO THE REGION FRIDAY...AND REMAIN THROUGH THE WEEKEND. LOW PRESSURE WILL APPROACH THE REGION DURING THE FIRST HALF OF NEXT WEEK. && .NEAR TERM /THROUGH FRIDAY/... COASTAL LOW PRESSURE WILL CONTINUE TO MOVE AWAY FROM THE REGION TONIGHT WHILE HIGH PRESSURE BUILDS TO OUR NORTH. LOW-LEVEL MOISTURE TRAPPED UNDERNEATH THE SUBSIDENCE INVERSION HAS CAUSED LOW CLOUDS AND PATCHY DRIZZLE THIS EVENING. HOWEVER...DRIER AIR SHOULD WORK ITS WAY IN FROM THE NORTH ALLOWING FOR SKIES TO CLEAR OUT OVERNIGHT. AREAS OF FOG MAY DEVELOP DUE TO RADIATIONAL COOLING ONCE THE LOW CLOUDS DISSIPATE. IMPROVING CONDITIONS ABOUND ON FRIDAY AS DRYING OCCURS AND FLOW BECOMES INCREASINGLY ANTICYCLONIC. RESULT WILL BE A RETURN TO SUNSHINE AND TEMPERATURES HIGHER OVER TODAY/S COOL-ISH NUMBERS POSSIBLY BY 10 DEGREES /MAINLY MID 70S/. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/... RIDGE BUILDS IN FOR THE WEEKEND. THIS SHOULD PROMOTE MOSTLY CLEAR/MOSTLY SUNNY SKIES. WITH MOSTLY CLEAR SKIES AT NIGHT...TEMPERATURES WILL BE NEAR CLIMO BUT DURING THE DAYTIME ABOVE NORMAL TEMPERATURES ARE EXPECTED WITH THE POTENTIAL FOR MAXIMA ABOVE 80 IN SOME SPOTS. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... ECMWF 500MB TROUGH IN OHIO/MISSISSIPPI VALLEY SUNDAY NIGHT WILL DEVELOP INTO BRIEF CUT-OFF LOW LATE TUESDAY. LOW WILL OPEN BACK UP WEDNESDAY AND MOVE EAST OF CWA AS TROUGH THURSDAY. HIGH PRESSURE RIDGING OVER CWA WILL WEAKEN ALLOWING INCREASING CHANCES OF PRECIPITATION TO AFFECT THE MIDDLE ATLANTIC REGION MONDAY THROUGH EARLY WEDNESDAY. LATER WEDNESDAY HIGH PRESSURE WILL RETURN TO THE AREA. && .AVIATION /00Z FRIDAY THROUGH TUESDAY/... LOW CLOUDS AND MVFR CIGS SHOULD SLOWLY DISSIPATE OVERNIGHT AS DRIER AIR WORKS ITS WAY INTO THE AREA. HOWEVER...RADIATIONAL COOLING WILL CAUSE AREAS OF FOG IF THE LOW CLOUDS DISSIPATE AND IFR VSBYS ARE POSSIBLE INTO EARLY FRIDAY MORNING. HIGH PRESSURE BUILDS IN FOR FRIDAY AND REMAINS THROUGH THE WEEKEND THEN BREAKS DOWN EARLY NEXT WEEK. && .MARINE... NORTHERLY WINDS WILL CONTINUE TO CHANNEL DOWN THE BAY AND LOWER TIDAL POTOMAC RIVER THROUGH FRIDAY MORNING. SCA CONTINUES INTO FRIDAY MORNING FOR THESE AREAS. WINDS WILL DIMINISH LATER FRIDAY AS HIGH PRESSURE BUILDS CLOSER TO THE WATERS. HIGH PRESSURE BUILDS IN THIS WEEKEND AND NO FLAGS ARE EXPECTED. LOW PRESSURE MAY AFFECT THE AREA EARLY NEXT WEEK. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 10 AM EDT FRIDAY FOR ANZ530>534-537- 539>541-543. && $$ SYNOPSIS...BPP NEAR TERM...BJL/BPP SHORT TERM...BPP LONG TERM...CEM AVIATION...BJL/CEM/BPP MARINE...BJL/CEM/BPP

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