Area Forecast Discussion
Issued by NWS Wakefield, VA

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000 FXUS61 KAKQ 290646 AFDAKQ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WAKEFIELD VA 246 AM EDT FRI APR 29 2016 .SYNOPSIS... A FRONTAL BOUNDARY REMAINS NEARLY STATIONARY ACROSS NORTHERN NORTH CAROLINA THROUGH FRIDAY. WEAK WAVES OF LOW PRESSURE WILL MOVE EAST ALONG THIS BOUNDARY... BRINGING UNSETTLED CONDITIONS TO THE REGION. WEAK HIGH PRESSURE RETURNS FOR A MOSTLY DRY LATER FRIDAY AND SATURDAY...FOLLOWED BY INCREASING RAIN CHANCES WITH THE NEXT WEATHER SYSTEM SUNDAY INTO MONDAY. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... CANCELLED THE WATCH AT 9 PM AS THE STORMS HAVE MOVED OUT OF THAT REGION. DESPITE MOST OF THE FA WEDGED IN A COOL AIRMASS AT THE SFC... MERGING BOUNDARIES ALONG WITH STRONG MID LEVEL LAPSE RATES SUPPORTS CONTINUING THE CONVECTION FOR THE REST OF THE EVENING. COOL SFC AIR PREVENTING STRONG WINDS FROM REACHING THE GRND...BUT NMRS REPORTS OF SMALL HAIL PAST SVRL HRS AS THE STORMS CONTINUE TO PULSE. AREAS OF FOG BECOMING WIDESPREAD ACROSS THE REGION AND WILL CONTINUE TO DO SO THROUGH THE OVERNIGHT HOURS. ISSUED A DENSE FOG ADVSRY THROUGH 10 AM FRI OVER THE WATERS GIVEN CRNT CONDITONS. DON`T SEE VSBYS IMPROVING OVER THE WATER UNTIL AFTER SR. CONVECTION SLOWLY TAPERS OFF THROUGH THE NIGHT TO SLGHT CHC ALONG THE COAST AFTER 08Z. SOME DRIZZLE POSSIBLE AS WELL. LOWS IN THE U40S-L50S EXCEPT M-U50S SW. && .SHORT TERM /6 AM THIS MORNING THROUGH SATURDAY NIGHT/... DRIER PERIOD EXPECTED FOR FRIDAY AND SATURDAY, AS FRONT PUSHES A BIT FARTHER SOUTH OF THE AREA, AS SFC HIGH PRESSURE BUILDS DOWN ACROSS THE AREA LATER FRIDAY AND EARLY SATURDAY. EXPECT SOME LINGERING CLOUDS, ESPECIALLY ALONG THE COAST THROUGH FRIDAY MORNING. COULD SEE SOME PATCHY DRIZZLE/LGT RAIN, BUT WITH DRIER AIR ALOFT FILTERING IN...CHANCES OF MEASURING ARE LOW. HIGHS FRIDAY IN THE U50S TO LOW 60S NORTH...TO MID 70S SOUTH. INCREASING CLOUDINESS BUT CONTINUED MAINLY DRY FRIDAY NIGHT. SLIGHTLY COOLER WITH EARLY MORNING LOWS...RANGING FROM IN THE UPPER 40S TO MID 50S EASTERN SHORE/NRN NECK TO UPPER 50S/NEAR 60 SE COAST. && .LONG TERM /SUNDAY THROUGH THURSDAY/... DRY CONDITIONS TO BEGIN THE EXTENDED PERIOD WILL BE SHORT LIVED AS THE NEXT STORM SYSTEM APPROACHES FROM THE WEST. UPPER/SFC HIGH PRESSURE SLIDES OFF THE COAST SAT MORNING AS A WARM FRONT LIFTS INTO THE REGION. LEAD WAVE LIFTS ALONG THE FRONT INTO THE OH VALLEY SAT AFTERNOON...WITH ASSOCIATED MOISTURE ADVECTING INTO THE REGION SAT AFTERNOON. SHOWERS EXPECTED TO SPREAD INTO THE PIEDMONT AND NRN VA AS EARLY AS SAT AFTERNOON. ISENTROPIC FIELDS SUGGEST THAT PRECIP MAY ARRIVE FASTER AS THE LOW LEVELS MOISTEN DUE TO ONSHORE FLOW. THUS HAVE SPED TRENDS UP SLIGHTLY. REGARDLESS...SAT EXPECTED TO BE PARTLY CLOUDY TO MOSTLY CLOUDY. EXPECT WIDESPREAD SHOWERS TO SPREAD INTO THE REGION SAT NIGHT INTO SUNDAY MORNING AS LOW PRESSURE PUSHES OVER THE CENTRAL APPALACHIANS. SEVERAL PERTURBATIONS IN THE UPPER FLOW WILL PROVIDE FORCING FOR ASCENT ALONG THE FRONT. PERIODS OF SHOWERS CONTINUE SUNDAY INTO SUNDAY NIGHT. HAVE INCREASED POPS TO LIKELY EXCEPT IN THE SE SUNDAY. MODEL CONSENSUS NOW DROPS THE FRONT OVER THE AREA LATE SUNDAY INTO SUNDAY EVENING...WITH THE BEST CHANCES FOR MEANINGFUL/BENEFICIAL RAINFALL COMING ALONG THE FRONT. LIKELY POPS FOR ALL. LOW PRESSURE DEEPENS OFFSHORE MON WITH LINGERING MOISTURE AND LIFT PROVIDING FOR SCATTERED SHOWERS. THEREAFTER...UPPER LEVEL RIDGE STRENGTHENS OVER THE WRN CONUS...RESULTING IN TROUGHING THRU THE MIDDLE OF NEXT WEEK. ECMWF CONTINUES TO STALL THE FRONT ALONG THE COAST MON DUE TO WEAKER UPPER LEVEL FORCING COMPARED TO ITS GFS COUNTERPART. GFS PUSHES THE FRONT OFF THE SHORE WITH HIGH PRESSURE BUILDING IN ITS WAKE. PREFER THE GFS BASED ON THE PATTERN...BUT WILL NOT COMPLETELY DISCOUNT THE ECMWF. WILL KEEP MENTION OF SLIGHT CHANCE POPS INLAND AND LOW END CHANCE POPS ALONG THE COAST TO ACCOUNT FOR UNCERTAINTY TUES AND WEDS AS THE ECMWF LIFTS AN AREA OF LOW PRESSURE ALONG THE STALLED BOUNDARY. TEMPS EXPECTED TO REMAIN SEASONABLE WITH HIGHS IN THE UPPER 60S/LOW 70S (COOLER ALONG THE COAST). WARMEST DAY BEING MON WITH HIGHS IN THE MID/POSSIBLY UPPER 70S. LOWS GENERALLY IN THE 50S. && .AVIATION /07Z FRIDAY THROUGH TUESDAY/...
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A STATIONARY FRONT CONTINUES TO LINGER OVER NC EARLY THIS MORNING...WITH HIGH PRESSURE OVER THE SAINT LAWRENCE VALLEY RIDGING SWD INTO THE NRN MID-ATLANTIC. STRATUS PERSISTS OVER THE AREA WITH CIGS AVERAGING 300-600FT. EARLIER SHOWERS/TSTMS HAVE WEAKENED AND MOVED OFFSHORE...WITH SOME LINGERING SHOWERS FROM SRN VA INTO NE NC. IFR CIGS ARE EXPECTED TO PREVAIL THROUGH THE MORNING HOURS...WITH VSBY FALLING TO 2-4SM BY 08Z. A SIMILAR SURFACE PATTERN WILL CONTINUE TODAY. HOWEVER...A SHORTWAVE TROUGH TRACKS ACROSS THE AREA TODAY...WITH TIME-HEIGHT CROSS-SECTIONS INDICATING THAT CIGS LIFT THIS AFTN FOR RIC/PHF/ORF/ECG. SBY IS FORECAST TO REMAIN IFR THROUGH THE DAY. STRATUS IS ONCE AGAIN EXPECTED TO SETTLE INTO THE REGION TONIGHT. DRY CONDITIONS ARE ANTICIPATED TONIGHT INTO SATURDAY. A WARM FRONT LIFTS THROUGH THE AREA SATURDAY NIGHT WITH AN INCREASING CHC FOR -RA AND DEGRADED FLIGHT CONDITIONS LATER SATURDAY NIGHT INTO SUNDAY MORNING. LOW PRESSURE TRACKS THROUGH THE OHIO VALLEY SUNDAY AND ACROSS THE NRN MID- ATLANTIC SUNDAY NIGHT. RA IS LIKELY SUNDAY INTO SUNDAY NIGHT...WITH A MINIMAL CHC OF THUNDER SUNDAY AFTN. A COLD FRONT DROPS THROUGH THE AREA MONDAY...AND SETTLES S OF THE REGION MONDAY NIGHT AND TUESDAY.
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&& .MARINE... QUASI-STATIONARY FRONT ANALYZED JUST SOUTH OF THE WATERS THIS AFTN WITH LOW PRESSURE JUST WEST OF THE AREA. LOW PRESSURE SLIDES OFFSHORE TONIGHT INTO FRIDAY...WHILE THE LINGERING FRONTAL BOUNDARY DROPS FARTHER SOUTH INTO THE CAROLINAS. NE LLVL WIND IS EXPECTED TO INCREASE TO 15-20KT N OF PARRAMORE ISLAND...AND NWPS/WNAWAVE BOTH AGREE W/SEAS INCREASING TO 4-6FT SEAS LATER TONIGHT INTO FRIDAY. AN SCA CONTINUES THROUGH EARLY SATURDAY FOR THE BUILDING SEAS. HIGH PRESSURE BUILDS IN FROM THE N FRIDAY NIGHT INTO SATURDAY. CURRENT MODEL GUIDANCE SLIDES THE LOW WELL OFFSHORE BEFORE THE HIGH BUILDS IN. HENCE...FORECAST WIND SPEEDS ARE NOT AS STRONG AND FORECAST SEAS ARE CORRESPONDINGLY LOWER...SO SCA CONDITIONS ARE NOT EXPECTED TO PERSIST INTO SATURDAY ATTM. HIGH PRESSURE SLIDES OFF THE NE COAST SATURDAY AS THE NEXT STORM SYSTEM APPROACHES FROM THE WEST. ONSHORE FLOW OF 10 TO 15 KT PERSISTS THROUGH SATURDAY NIGHT. SEAS GENERALLY 3 TO 4 FT. LOW PRESSURE LIFTS INTO THE NRN MID ATLANTIC REGION SAT NIGHT AS A WARM FRONT LIFTS OVER THE WATERS. FLOW BECOMES SWLY SUN AOB 15 KT. COLD FRONT DROPS THROUGH THE REGION SUN NIGHT...STALLING ALONG THE COAST MONDAY. LACK OF LOW LEVEL CAA AND GRADIENT WINDS EXPECTED TO KEEP CONDITIONS SUB-SCA BEHIND THE FRONT. NW WINDS AROUND 15 KT BUILD SEAS TO 4 FT MON NIGHT...POSSIBLY UP TO 5 FT NEAR 20 NM OUT. THE FRONT STALLS ALONG THE COAST/JUST OFFSHORE THRU THE MIDDLE OF NEXT WEEK. && .AKQ WATCHES/WARNINGS/ADVISORIES...
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MD...NONE. NC...NONE. VA...NONE. MARINE...DENSE FOG ADVISORY UNTIL 10 AM EDT THIS MORNING FOR ANZ630>632- 634>638-650-652-654-656-658. SMALL CRAFT ADVISORY UNTIL 1 AM EDT SATURDAY FOR ANZ650-652.
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&& $$ SYNOPSIS...MAM NEAR TERM...MPR/MAM SHORT TERM...BMD/MAM LONG TERM...SAM AVIATION...AJZ MARINE...BMD/MAM

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