Area Forecast Discussion
Issued by NWS Wakefield, VA

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243 FXUS61 KAKQ 220237 AFDAKQ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WAKEFIELD VA 1037 PM EDT THU MAY 21 2015 .SYNOPSIS... LOW PRESSURE PUSHES OFF THE NORTH CAROLINA COAST THIS EVENING...THEN LIFTS NORTHEAST WELL OFF THE MID-ATLANTIC COAST TONIGHT. HIGH PRESSURE WILL BUILD ACROSS THE AREA FRIDAY INTO SATURDAY...BEFORE SLIDING OFF THE COAST SUNDAY INTO EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
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LATEST SFC ANALYSIS PLACES LOW PRESSURE JUST OFF THE SE VA/NE NC COAST THIS EVENING. HIGH PRESSURE IS CENTERED OVER THE MID-MS VALLEY. EARLIER SHOWERS/THUNDERSTORMS HAVE PUSHED OFFSHORE...LEAVING THE LOCAL AREA GENERALLY DRY. A SHORTWAVE VISIBLE ON GOES WATER VAPOR TRAVERSING NRN OH/ERN GREAT LAKES REGION HAS GENERATED SOME PATCHY LIGHT RAIN/DRIZZLE OVER THE NRN PIEDMONT THIS EVENING TO GO ALONG WITH ABUNDANT LOW LEVEL MOISTURE. EXPECT LIGHT RAIN/DRIZZLE TO WANE THROUGH MIDNIGHT AS LOW LEVEL LIFT DISSIPATES. ALSO HELD ONTO SLIGHT CHANCE ALONG THE COAST FOR LIGHT RAIN/DRIZZLE THRU MIDNIGHT. SHORTWAVE CROSSES THE NRN MID-ATLANTIC REGION LATE TONIGHT AS THE SFC LOW ACCELERATES AWAY FROM THE COAST. HIGH PRESSURE NUDGES IN FROM THE WEST. DRYING CONDITIONS AND DECREASING CLOUD COVER EXPECTED THRU EARLY FRI MORNING. LOWS TONIGHT GENERALLY IN THE UPPER 40S NW TO MID 50S SE.
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&& .SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/... SFC HIGH PRESSURE TO THE WNW PREVAILS FOR MUCH OF FRI...ALLOWING FOR SUNSHINE AND COMFORTABLE TEMPS. HIGHS MAINLY IN THE 70S. HOWEVER...THE MODELS DO SHOW A SECONDARY COLD FRONT APPROACHING FROM THE NORTH LATE FRI...AND PASSING THRU THE AREA FRI EVE/NIGHT. MODELS ARE NOT AS BULLISH ON PRODUCING ISOLD SHOWERS WITH THE FRONT ACROSS THE NRN NECK/ERN SHORE...SO HAVE REMOVED THEM FROM THE FORECAST. THE FRONT WILL HOWEVER PRODUCE SOME CLOUDS...ACROSS MAINLY THE NRN NECK AND ERN SHORE. LOWS WILL RANGE FROM THE UPR 40S NW TO THE MID TO UPR 50S SE. BY SAT...COOL HIGH PRESSURE SETTLES OVER THE MID-ATLANTIC REGION. SUNSHINE IS EXPECTED WITH NORTH WINDS BECOMING ONSHORE LATE IN THE DAY HELPING TO KEEP MAX TEMPS IN CHECK. HIGHS 70-75 INLAND/PIEDMONT...AND IN THE MID TO UPR 60S NEAR THE WATER. THE SFC HIGH SHIFTS OFFSHORE SUNDAY FOR CONTINUED DRY WX. HIGH TEMPS WILL WARM BACK INTO THE UPR 70S/LOW 80S WITH SOUTHERLY RETURN FLOW. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... MEDIUM RANGE BEGINS WITH LATEST GFS/ECMWF REMAINING INTO GOOD AGREEMENT WITH UPPER LEVEL RIDGE CENTERED OVER SE GA/FLORIDA SUN NIGHT...BUILDING BACK NORTH INTO THE MID ATLC STATES MON/TUE. LATEST GFS DAMPENS THE RIDGE SOMEWHAT BY MIDWEEK...BUT HAS GENLY TRENDED TO THE STRONGER RIDGE SOLUTION OF THE ECMWF. THIS PATTERN WILL LEAD TO WARM/SUMMER-LIKE WX THROUGH THE ENTIRE PERIOD. A WEAK WARM FRONT STILL PROGGED TO LIFT N THROUGH THE OHIO VALLEY AND NRN MID ATLC REGION LATE SUN NIGHT/MON MORNING...BUT BULK OF PRECIP SHOULD STAY OFF TO OUR N. WILL MAINTAIN A 20% POP ACRS THE FAR NE PORTIONS OF THE CWA TO ACCOUNT FOR THIS INTO MIDDAY MON...BUT WILL MAINTAIN A DRY FORECAST ELSEWHERE UNDER PARTLY CLOUDY SKIES. FROM MON-TUE...500 MB HEIGHTS RISE AND BULK OF TSTM ACTIVITY SHOULD CONTINUE TO STAY OFF TO OUR NORTH. WILL KEEP A LATE AFTN/EVENING 20% POP OVER JUST THE FAR NRN PORTIONS OF THE CWA ON TUE...AND GENLY A 20% POP IN THE LATE AFTN/EVENING OVER MUCH OF THE AREA WED/THU (UP TO 30% FAR NW). INCREASING HUMIDITY AND HIGH TEMPS WARMING BACK TO 85-90 F MON...AND UPPER 80S TO LWR 90S TUE-THU...FAVORING ECMWF FOR HIGHS (GFS HIGHS ONLY IN MID-UPPER 80S WELL INLAND APPEARS TOO COOL IN THIS PATTERN). CONDITIONS WILL GENLY BE ABOUT 5 DEGREES COOLER AT THE COAST. && .AVIATION /03Z FRIDAY THROUGH TUESDAY/... LOW PRES SYS HAS MOVD OFF THE COAST ALONG WITH MOST OF THE RAIN...EXCEPT ALONG THE ERN SHORE. STRATUS AND SOME FOG WILL LINGER FOR A FEW HOURS TONIGHT BEFORE A CLEARING TREND BEGINS AFTER MIDNIGHT. WIND ACROSS THE REGION WILL BE GENERALLY FROM THE N-NE AND LIGHT EXCEPT ALONG THE IMMEDIATE COASTAL AREAS WHERE GUSTS TO 15 TO 20 KT WILL PREVAIL THRU THE NIGHT. ALL DATA SUPPORTING MUCH DRIER AIR MOVG IN AFTER MIDNIGHT. THE LIGHT WIND AND MOISTURE FROM THE RAIN MAY CREATE SOME AREAS OF GROUND FOG OVERNIGHT BUT CONFIDENCE IS LOW AS TO WHERE AND TO WHAT EXTENT. WILL LEAVE OUT OF THE FORECAST AT THIS TIME. VFR CONDITIONS FRI AND INTO THE WEEKEND AS HIGH PRES BUILDS INTO THE AREA. && .MARINE... ADDED UPPER JAMES/YORK/RAPPAHANNOCK RIVER TO SCA FOR THE EVENING WITH CURRENT NNE SURGE OF WIND...EXPECT THE WINDS TO DIMINISH A BIT AFTER MIDNIGHT SO HAVE THE HEADLINE THROUGH 1 AM. PREV DISC... PRESSURE GRADIENT TEMPORARILY HAS WEAKENED ACRS SOME OF THE AREA GIVEN APPROACH OF SFC LOW...BUT WILL RAPIDLY INCREASE OVER THE NEXT FEW HRS AND SHIFT TO THE NNW AS SFC LOW SLIDES OFFSHORE. QUICK TIGHTENING OF SFC PG, A RESULT OF STRONG 6-HR PRESSURE RISES ON THE ORDER OF 6-8 MB ON THE BACK SIDE OF THE SYSTEM AS IT RAPIDLY INTENSIFIES OFF THE COAST LATER TONIGHT, SHOULD ALLOW A STRONG SCA SURGE OF WIND. SMALL CRAFT ADVISORIES ARE IN PLACE OVER THE BAY/SOUND/LOWER JAMES...AND WILL GO INTO PLACE LATER THIS EVENING FOR THE COAST. SCA CONDITIONS DROP OFF LATER FRI MORNING AND CONDITIONS IMPROVE THROUGH THE DAY ON FRI AS LOW PRESSURE SYSTEM QUICKLY SCOOTS TOWARD THE CANADIAN MARITIMES BY FRIDAY NIGHT. ANOTHER BRIEF NORTHERLY SURGE EXPECTED FRIDAY NIGHT AS COOL ~1030 MB HIGH PRESSURE BUILDS IN FROM THE N. THE POTENTIAL FOR ADDITIONAL HEADLINES BEING NEEDED EXISTS WITH THE ASSOCIATED SFC COLD FRONT AS IT DROPS ACROSS THE AREA FRI NIGHT/EARLY SAT. THE HIGH SHIFTS OFF THE COAST FOR THE LATTER HALF OF THE HOLIDAY WEEKEND WITH THE RESULTANT SFC FLOW BACKING TO THE S/SE, AVGG AOB 15 KT. && .AKQ WATCHES/WARNINGS/ADVISORIES... MD...NONE. NC...NONE. VA...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 1 AM EDT FRIDAY FOR ANZ635>637. SMALL CRAFT ADVISORY UNTIL 10 AM EDT FRIDAY FOR ANZ630>632-634- 650-652-654-656-658. SMALL CRAFT ADVISORY UNTIL 7 AM EDT FRIDAY FOR ANZ633-638. && $$ SYNOPSIS...JDM NEAR TERM...JDM/SAM SHORT TERM...JDM/TMG LONG TERM...LKB AVIATION...MPR/JEF MARINE...LKB/MAM

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