Area Forecast Discussion
Issued by NWS Sterling, VA

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000 FXUS61 KLWX 030131 AAA AFDLWX AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 931 PM EDT TUE SEP 2 2014 .SYNOPSIS... A WEAK COLD FRONT THAT WILL CROSS THE AREA TONIGHT. HIGH PRESSURE WILL THEN BUILD FROM THE MIDWEST THROUGH WEDNESDAY THEN PERSIST OFFSHORE THURSDAY INTO THE WEEKEND. A COLD FRONT WILL ENTER THE REGION IN THE SATURDAY NIGHT TIME FRAME. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... THE COVERAGE OF SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DECREASE LATE THIS EVENING AND OVERNIGHT DUE TO THE LOSS OF DAYTIME HEATING. A WEAK COLD FRONT WILL PASS THROUGH THE REGION LATE TONIGHT...BUT LITTLE TEMPERATURE OR DEWPOINT GRADIENT WILL BE ASSOCIATED WITH THE FRONT. IN FACT...LOW-LEVEL MOISTURE WILL BE TRAPPED UNDERNEATH THE NOCTURNAL INVERSION LEADING TO AREAS OF FOG OVERNIGHT. MIN TEMPS WILL RANGE FROM THE 60S IN THE SHENANDOAH VALLEY AND POTOMAC HIGHLANDS TO THE LOWER AND MIDDLE 70S IN DOWNTOWN WASHINGTON AND BALTIMORE. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/... CWA WILL BE POST-FRONTAL ON WEDNESDAY. NORTHWEST WINDS WILL BRING SOME DRYING THROUGH THE CWA...LEADING TO PLENTY OF SUNSHINE AND LOWER HUMIDITY. FRONT LOOKS LIKE IT GETS HUNG UP IN CENTRAL VIRGINIA AS WEAK HIGH PRESSURE BUILDS IN FROM THE NORTH. A FEW AFTERNOON/EVENING THUNDERSTORMS ARE POSSIBLE NEAR THE BOUNDARY ACROSS EXTREME SOUTHERN PORTIONS OF OUR CWA IN CENTRAL VIRGINIA. HIGH MOVES OFFSHORE ON THURSDAY. MAY SEE ISOLATED SHOWERS AND THUNDERSTORMS DEVELOP UP/NEAR THE BLUE RIDGE BY AFTERNOON. ACTIVITY WOULD LIKELY BE DIURNAL IN NATURE. TROUGH DEVELOPS ON FRIDAY...WITH THE POTENTIAL FOR MORE DIURNAL CONVECTION. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... ANOTHER COLD FRONT APPROACHES FRIDAY NIGHT. QUESTION IS HOW QUICKLY THE FRONT PUSHES THROUGH THE AREA. IT MAY MOVE THROUGH BY SATURDAY NIGHT...BUT ITS POSSIBLE IT DOESN/T CLEAR THE SOUTHEAST PART OF THE CWA UNTIL SUNDAY. HIGH PRESSURE AND DRY AIRMASS WILL BUILD INTO THE AREA MONDAY. && .AVIATION /02Z WEDNESDAY THROUGH SUNDAY/... COVERAGE OF CONVECTION WILL CONTINUE TO DIMINISH LATE THIS EVENING AND OVERNIGHT. AREAS OF FOG ARE EXPECTED. MVFR/IFR VSBYS ARE POSSIBLE LATE TONIGHT INTO EARLY WEDNESDAY MORNING. VFR EXPECTED WEDNESDAY POST-FRONTAL AND WITH HIGH PRESSURE IN CONTROL. HIGH MOVES OFFSHORE TO END THE WEEK. NEXT COLD FRONT WILL AFFECT THE AREA OVER THE WEEKEND. && .MARINE... PRIMARY CONCERN LATE THIS EVENING WILL BE GUSTY WINDS AND LIGHTNING IN SCATTERED SHOWERS AND THUNDERSTORMS. THUNDERSTORMS WILL DIMINISH IN COVERAGE OVERNIGHT. HIGH PRESSURE BUILDS IN FOR WEDNESDAY THEN MOVES OFFSHORE TO END THE WEEK. COLD FRONT MOVES THROUGH OVER THE WEEKEND. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && $$ SYNOPSIS...BPP NEAR TERM...BJL/BPP SHORT TERM...BPP LONG TERM...CEM AVIATION...BJL/CEM/BPP MARINE...BJL/CEM/BPP

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