Area Forecast Discussion
Issued by NWS Wilmington, NC

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000 FXUS62 KILM 311732 AFDILM AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON NC 132 PM EDT SUN AUG 31 2014 .SYNOPSIS... STRENGTHENING BERMUDA HIGH PRESSURE OFFSHORE WILL BRING SUMMERTIME HEAT AND HUMIDITY THROUGH THE LABOR DAY WEEKEND WITH A FEW SHOWERS AND THUNDERSTORMS POSSIBLE. A WEAK COLD FRONT WILL APPROACH FROM THE NORTH LATE NEXT WEEK...BUT WILL LIKELY STALL BEFORE REACHING THE AREA. BERMUDA HIGH PRESSURE AND A PIEDMONT TROUGH WILL REMAIN THE DOMINANT FEATURES INTO NEXT WEEKEND. && .NEAR TERM /THROUGH TONIGHT/...
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AS OF 1:30 PM SUNDAY...NO CHANGES TO THE FORECAST WITH THE LATEST UPDATE. PREVIOUS DISCUSSION FOLLOWS: A FEW SHOWERS ARE POPPING UP OVER SOUTHEASTERN BRUNSWICK COUNTY ALONG THE NASCENT SEA BREEZE FRONT. ANALYSIS OF MORNING SOUNDINGS AND LATEST GUIDANCE INDICATES ISOLATED SHOWERS WILL BE FORMING MOVING INLAND WITH THE SEA BREEZE FRONT INTO THE AFTERNOON HOURS. STRENGTH AND COVERAGE WILL BE LIMITED AS DRY AIR ALOFT MIXES DOWN TO THE LOWER LAYERS. NO SIGNIFICANT CHANGES TO THE FORECAST WITH THE LATEST UPDATE. PREVIOUS DISCUSSION FOLLOWS: SURFACE HIGH PRESSURE COVERS MUCH OF THE WESTERN AND CENTRAL ATLANTIC OCEAN. THE UPPER LEVEL RIDGE IS CENTERED JUST OFF THE CAROLINA COAST AND SHOULD KEEP ANY SYNOPTIC IMPULSES DEFLECTED AWAY TO OUR NORTH AND WEST. 850 MB TEMPERATURES AROUND +18C THIS AFTERNOON SHOULD RESULT IN HIGH TEMPERATURES IN THE MID 90S FROM MARION AND FLORENCE WESTWARD INTO DARLINGTON COUNTY. ONSHORE WINDS CLOSER TO THE COAST SHOULD KEEP TEMPERATURES A LITTLE COOLER...GENERALLY IN THE UPPER 80S TO LOWER 90S. ALTHOUGH THERE IS CONSIDERABLE DRY AIR ALOFT DUE TO THE UPPER RIDGE (COLUMN PRECIP WATER VALUES ARE ONLY 1.5 INCHES) VERY RICH MOISTURE EXISTS IN THE LOWEST LEVELS OF THE ATMOSPHERE. DEWPOINTS IN THE MID 70S THIS MORNING WILL FORTUNATELY MIX DOWN TO NEAR 70 THIS AFTERNOON INLAND...BUT THAT WILL STILL BE ENOUGH TO PUSH HEAT INDICES TO 100-103 DEGREES ACROSS MOST OF OUR FORECAST AREA. THIS MOISTURE MAY ALSO FUEL WIDELY SCATTERED SHOWERS NEAR THIS COAST LATER THIS MORNING...PROBABLY BECOMING LESSER IN COVERAGE THIS AFTERNOON AS DRIER AIR MIXES DOWNWARD. FORECAST POPS RANGE FROM 20-30 PERCENT... VIRTUALLY ALL EAST OF I-95 AND HIGHEST IN A STRIPE ACROSS LELAND TO BURGAW AS CONSISTENTLY INDICATED BY HOURLY HRRR MODEL RUNS THROUGH THE NIGHT. ANY LINGERING DAYTIME CUMULUS SHOULD QUICKLY DIE AWAY THIS EVENING... WITH ONLY A LITTLE PATCHY FOG OR LOW STRATUS EXPECTED TO DEVELOP OVERNIGHT. LOWS SHOULD FALL INTO THE LOWER 70S FOR MOST LOCALES...A FEW DEGREES WARMER NEAR THE BEACHES.
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&& .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... AS OF 3 AM SUNDAY...BERMUDA HIGH AND STRENGTHENING PIEDMONT TROUGH WILL BE THE MAIN SURFACE FEATURES THROUGH THE PERIOD. ALOFT A FLAT MID LEVEL RIDGE WILL EXTEND ACROSS MUCH OF THE SOUTHERN CONUS. DEEP WESTERLY FLOW IN THE MID LEVELS WILL PUSH TROPICAL MOISTURE EXPANDING NORTH FROM THE WESTERN GULF OF MEXICO OVER THE REGION MON AND TUE. INCREASING MOISTURE ALOFT ALONG WITH LOW LEVEL MOISTURE ADVECTION AROUND WEST SIDE OF BERMUDA HIGH WILL PUSH PRECIPITABLE WATER VALUES OVER 2 INCHES FOR MUCH OF THE PERIOD. FLAT MID LEVEL PATTERN MEANS LITTLE TO NO FORCING ALOFT WILL BE PRESENT. HOWEVER THE COMBINATION OF LOW LEVEL MOISTURE AND SURFACE HEATING WILL PUSH ML CAPE VALUES TO 1K-2K J/KG FOR MON AND OVER 2K J/KG ON TUE. CONVECTION WILL INITIALLY BE SLOW TO DEVELOP BUT ONCE SEA BREEZE AND PIEDMONT TROUGH TAKE SHAPE SHOWERS AND THUNDERSTORMS SHOULD START POPPING UP. WILL MAINTAIN CHC POP FOR EACH AFTERNOON BUT WITH SLIGHTLY HIGHER VALUES ON TUE GIVEN SLIGHTLY HIGHER CAPE VALUES. TEMPERATURES WILL RUN ABOVE CLIMO THROUGH THE PERIOD. HIGHS WILL RANGE FROM UPPER 80S ALONG THE IMMEDIATE COAST TO MID 90S INLAND. LOWS WILL BE IN THE LOW TO MID 70S. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... AS OF 3 AM SUNDAY...BERMUDA HIGH AND PIEDMONT TROUGH ALONG WITH ELONGATED MID LEVEL RIDGE WILL REMAIN THE SIGNIFICANT FEATURES THROUGH THE PERIOD. A COUPLE COLD FRONTS WILL TRY AND MAKE A RUN TO THE AREA DURING THE NEXT WEEK BUT THEY ARE LIKELY TO STALL AND WASH OUT JUST NORTH OF THE FORECAST AREA. THE SURFACE AND MID LEVEL PATTERNS ARE NOT ONES THAT GENERALLY SUPPORT FRONTS MOVING INTO AND SOUTH OF THE CAPE FEAR REGION. PRECIPITABLE WATER VALUES WILL REMAIN AROUND 2 INCHES THROUGH THE END OF THE WEEK. DIURNAL HEATING AND SOUTHWEST FLOW WILL RESULT IN ML CAPE VALUES ABOVE 2K J/KG FOR MUCH OF THE PERIOD. WEAK GRADIENT WILL ALLOW SEA BREEZE DEVELOPMENT AND PIEDMONT TROUGH SHOULD BE WELL DEFINED. TYPICAL SUMMER PATTERN WITH NEAR CLIMO PWATS AND TEMPERATURES NEAR TO SLIGHTLY ABOVE CLIMO SUGGEST POP WILL BE NEAR CLIMO FOR MUCH OF THE PERIOD...30 PERCENT. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/...
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AS OF 18Z...VFR IS EXPECTED AT THE TERMINALS INTO THIS EVENING...ALTHOUGH THERE COULD BE PERIODS EARLY THIS AFTERNOON AT KFLO/KLBT OF CIGS 3-4K. THE BEST SHOWER POTENTIAL...ALBEIT ISOLATED...THIS AFTERNOON WILL BE INLAND OF THE COASTAL TERMINALS. SE-S WINDS WILL INCREASE TO 10-20 KT AT THE COASTAL TERMINALS AND TO 5 TO 10 KT AT KFLO/KLBT THIS AFTERNOON. WINDS SLOWLY DECREASE THIS EVENING...BECOMING LGT SW LATE THIS EVENING AND OVERNIGHT. BEST BR/FG POTENTIAL WILL BE THE INLAND TERMINALS OVERNIGHT...WITH IFR VSBYS/LIFR CIGS LIKELY KFLO/KLBT BY 08Z. VFR ALL TERMINALS AFTER 13Z WITH S WINDS DEVELOPING AT THE COASTAL TERMINALS AND SW-W WINDS AT KFLO/KLBT. EXTENDED OUTLOOK...INCREASING CHANCES FOR AFTN SHOWERS/TSTMS MONDAY THROUGH THURSDAY WITH BRIEF AND LOCALIZED PERIODS OF MVFR POSSIBLE.
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&& .MARINE...
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NEAR TERM /THROUGH TONIGHT/... AS OF 1:30 PM SUNDAY...NO CHANGES TO THE FORECAST WITH THE LATEST UPDATE. PREVIOUS DISCUSSION FOLLOWS: BENIGN CONDITIONS OVER THE WATERS THIS MORNING...WITH LIGHT WINDS AND SEAS IN THE 2 FT RANGE. THIS IS ALL AS EXPECTED...SO NO CHANGES TO THE FORECAST NEEDED. PREVIOUS DISCUSSION FOLLOWS: SURFACE HIGH PRESSURE COVERS MOST OF THE WESTERN AND CENTRAL ATLANTIC OCEAN. THIS SHOULD PRODUCE A SOUTH- SOUTHEAST WIND TODAY...VEERING MORE SOUTHWESTERLY TONIGHT. SEAS CURRENTLY AROUND 2 FEET MAY OCCASIONALLY REACH 3 FEET IN A COMBINATION OF SOUTHEASTERLY SWELL AND LOCAL WIND WAVES...WITH ANY SCATTERED MORNING SHOWERS EXPECTED TO DISSIPATE BY EARLY AFTERNOON. SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... AS OF 3 AM SUNDAY...BERMUDA HIGH AND PIEDMONT TROUGH WILL MAINTAIN SOUTHWEST FLOW OVER THE WATERS THROUGH THE PERIOD. SPEEDS 10 KT OR LESS WILL INCREASE TO A SOLID 15 KT EACH AFTERNOON AND EVENING AS THE PIEDMONT TROUGH STRENGTHENS. SEAS IN THE 2 TO 3 FT RANGE. LONG TERM /WEDNESDAY THROUGH THURSDAY/... AS OF 3 AM SUNDAY...MINIMAL CHANGE FOR THE LONG TERM PERIOD. BERMUDA HIGH REMAINS IN PLACE AS DOES THE PIEDMONT TROUGH. LATE IN THE PERIOD A WEAKENING COLD FRONT WILL APPROACH FROM THE NORTH BUT IS EXPECTED TO STALL BEFORE REACHING THE AREA. SOUTHWEST FLOW AROUND 10 KT WILL INCREASE TO A SOLID 15 KT EACH AFTERNOON AND EVENING. SEAS WILL RUN 2 TO 3 FT.
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&& .ILM WATCHES/WARNINGS/ADVISORIES... SC...NONE. NC...NONE. MARINE...NONE. && $$ NEAR TERM...REK/TRA SHORT TERM...III LONG TERM...III AVIATION...MRR MARINE...REK/TRA/III

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