Area Forecast Discussion
Issued by NWS Wakefield, VA

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000 FXUS61 KAKQ 290551 AFDAKQ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WAKEFIELD VA 151 AM EDT WED JUL 29 2015 .SYNOPSIS... HIGH PRESSURE REMAINS OFFSHORE THROUGH MIDWEEK...WITH THE NEXT COLD FRONT CROSSING THE AREA BY THURSDAY NIGHT. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... LATEST REGIONAL RADAR MOSAIC DEPICTS AREA OF SHOWERS PERSISTING OVER THE ERN VA PIEDMONT LATE THIS EVENING...REMAINING GENERALLY WEST OF THE LOCAL AREA. OTHERWISE...EARLIER SHOWERS/THUNDERSTORMS HAVE DISSIPATED OVER THE LOCAL AREA. SHORTWAVE VISIBLE ON GOES WV PROGGED TO DROP OVER ERN VA TONIGHT IN CONCERT WITH INCREASING WINDS ALOFT. A WARM/MOIST AIR MASS REMAINS IN PLACE OVER THE LOCAL AREA WITH DEWPOINTS IN THE 70S AND PWATS AROUND 2 INCHES. WILL MAINTAIN SLIGHT CHANCE-CHANCE POPS OVER THE PIEDMONT INTO CENTRAL VA AS RAP DEPICTS AN AXIS OF DEEP MOISTURE CONVERGENCE OVER THAT REGION. SKY AVERAGES PARTLY CLOUDY/MOSTLY CLOUDY INLAND AND MOSTLY CLEAR NE COUNTIES. LOWS IN THE LOW 70S. && .SHORT TERM /6 AM THIS MORNING THROUGH FRIDAY/... WEDNESDAY... UPPER LEVEL RIDGING CONTINUES TO EXPAND EASTWARD FROM THE SOUTHERN PLAINS. THIS WILL HELP TO LIMIT AFTN CONVECTION WHILE MAX TEMPS WARM A COUPLE OF DEGREES. HAVE CHC POPS (25-30%) ALONG AND WEST OF I-95. PARTLY SUNNY W/ HIGH TEMPS IN THE UPR 80S TO LOW 90S...WITH LOW/MID 80S AT THE BEACHES. MILD WED NIGHT W/ LOW TEMPS IN THE LOW/MID 70S. THURSDAY... UPR RIDGING RETROGRADES A BIT THURSDAY AS A TROUGH MOVES ACROSS THE GREAT LAKES AND PUSHES A COLD FRONT INTO THE MID-ATLANTIC REGION BY LATE IN THE DAY. DUE TO THE LATE ARRIVAL OF THE FRONT...CHC POPS (30-50%) WILL REMAIN ACROSS WESTERN AREAS DURING THE AFTN...LOWERING TO ~20% AT THE COAST. MAX TEMPS WILL REACH INTO THE UPR 80S TO LOW 90S...EXCEPT LOW/MID 80S AT THE IMMEDIATE COAST. THURSDAY NIGHT AND FRIDAY... THE COLD FRONT MOVES ACROSS THE FA THURSDAY NIGHT BEFORE STALLING ACROSS FAR SE VA AND THE EASTERN CAROLINAS ON FRIDAY. HAVE SOLID CHANCE POPS (30-50%) MOST AREAS WITH THE PASSAGE OF THE FRONT THRU MIDDAY FRI...THEN FOCUS CHC POPS ACROSS SE VA AND NE NC FRIDAY AFTN. DRY WX SHOULD RETURN TO NW AREAS BY LATE MORNING OR AFTERNOON. LOWS THU NIGHT IN THE 70S. HIGHS FRIDAY IN THE 80S TO AROUND 90. && .LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/... PATTERN BEGINS WITH A MID/UPPER LEVEL RIDGE CENTERED OVER THE SW CONUS AND AN UPPER LEVEL LOW PERSISTING ACRS HUDSON BAY CANADA. GFS/ECMWF INTO BETTER DECENT AGREEMENT THAT AN UPPER TROUGH AXIS WILL EXTEND SOUTH INTO THE GREAT LAKES SAT...THEN FLATTEN OUT SUN WITH A SHORTWAVE PUSHING ACRS THE MID ATLC BY MON. FRONT STALLS AND WEAKENS OVER FAR SRN VA/NC LATE FRI INTO THE WEEKEND. BEST CHC FOR PRECIP LOOKS TO BE ACRS THE FAR SOUTH/MAINLY NE NC THROUGH THE WEEKEND BUT EVEN HERE WILL ONLY GO WITH A 20-30% POPS/PRIMARILY FOR THE AFTN/EVENING TIMEFRAME (TAPERED TO 20% FAR SRN VA AND DRY ELSEWHERE). DID RAISE POPS A BIT FOR MON DUE TO THE SHORTWAVE MOVING THROUGH BUT NOT A LOT OF CONFIDENCE AS THIS IS 5-6 DAYS OUT SO WILL GENLY KEEP POPS ONLY AT 30-40% SOUTH TO 20% NORTH. KEEPING POPS AROUND 20% ALL AREAS TUE. TYPICAL SUMMERTIME TEMPERATURES CAN BE EXPECTED WITH HIGHS MAINLY RANGING FROM THE MID/UPPER 80S ALONG THE COAST TO THE UPPER 80S TO LOWER 90S INLAND. LOWS GENERALLY RANGING FROM THE MID 60S NW TO THE LWR 70S SE THROUGH THE PERIOD. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/...
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UPR LEVEL RIDGING WILL EXPAND EWD FM THE SRN PLAINS TODAY. THIS WILL HELP TO LIMIT AFTN TSTMS FOR THE ERN HALF OF THE AREA (INCLUDING TAF SITES KSBY/KPHF/KORF/KECG). HOWEVER...THERE IS JUST ENOUGH MOISTURE AND ENERGY WRAPPING ARND THE UPR RIDGE TO KEEP VCSH AT KRIC (INCLUDING AREAS ALONG AND W OF INTERSTATE 95). OVERALL SHEAR REMAINS VERY WEAK...THEREFORE THE MAIN THREAT WITH AFTN/EVENING TSTMS WILL BE HEAVY RAINFALL CAUSING QUICK REDUCTIONS TO CIGS (MVFR) AND VSBYS (IFR). A COLD FRONT WILL THEN SLOWLY PUSH INTO AND ACRS THE MID ATLC REGION THU THRU FRI AFTN. THIS FRONT WILL PROVIDE SCTD TSTM CHCS AT ALL TAF SITES DURING THIS PERIOD.
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&& .MARINE... WEAK SFC HIGH PRESSURE IS CENTERED OFF THE COAST WITH WEAK SFC TROUGHING INLAND ACRS THE PIEDMONT AND COASTAL PLAIN. S/SE WINDS AVG 10-15 KT THIS EVENING/OVERNIGHT...AND WILL DROP OFF TO S/SW 5-10 KT WED MORNING. MODELS SUGGEST THAT WINDS MAY BE A LITTLE STRONGER LATE WED AFTN/WED NIGHT AS SFC/LEE TROUGH OVER VA DEEPENS SLIGHTLY AND HELPS S/SE WINDS AVG AROUND 15 KT IN THE BAY. COULD BE A FEW HRS WORTH OF 20 KT GUSTS IN THE BAY BUT TOO MARGINAL TO CONSIDER ANY SCA HEADLINES FOR NOW. WAVES GENLY 1-2 FT IN THE BAY BUT WILL PROBABLY BUILD TO 2-3 FT WED EVENING. SEAS 2-3 FT. A WEAK COLD FRONT APPROACHES THE WATERS LATE THU...THEN STALLS SOUTH OF THE AREA BY LATE IN THE WEEK. S/SE WINDS AVG 10-15 KT...TURNING SSW THU NIGHT. NOT A STRONG COOL SURGE ON FRI AS WINDS SHIFT TO THE NORTH WITH THE FRONT DISSIPATING OVER SRN VA/ERN NC SO WILL KEEP WINDS IN THE 10-15 KT RANGE. FLOW GRADUALLY SHIFTS TO E/SE INTO THE WEEKEND WITH WAVES 1-2 FT/SEAS 2-4 FT. && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...NONE. NC...NONE. VA...NONE. MARINE...NONE. && $$ SYNOPSIS...JDM NEAR TERM...JDM/SAM SHORT TERM...JDM LONG TERM...LKB AVIATION...TMG MARINE...LKB/TMG

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