Area Forecast Discussion
Issued by NWS Wilmington, NC

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000 FXUS62 KILM 291727 AFDILM AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE WILMINGTON NC 130 PM EDT MON SEP 29 2014 .SYNOPSIS... HIGH PRESSURE WILL SLOWLY WEAKEN ACROSS THE AREA AS LOW PRESSURE DEVELOPS OFF THE SOUTHEAST UNITED STATES COAST TONIGHT. THE LOW WILL STAY SOUTH AND SOUTHEAST OF THE AREA THROUGH TUESDAY BEFORE MOVING FARTHER OFFSHORE. THE LOW WILL BRING A CHANCE OF RAIN TO THE AREA TODAY THROUGH EARLY TUESDAY. DRY HIGH PRESSURE WILL BUILD IN BY MID WEEK. A COLD FRONT WILL MOVE ACROSS THE CAROLINAS FRIDAY INTO SATURDAY WITH COOL AND DRY HIGH PRESSURE BUILDING IN FOR THE LATTER PART OF THE WEEKEND. && .NEAR TERM /THROUGH TONIGHT/... AS OF 1030 AM MONDAY...12Z AREA RAOBS CONFIRM RUC ANALYSIS OF A LARGE NE TO SW GRADIENT IN TOTAL PRECIPITABLE WATER...RANGING FROM 1.2 TO 2.2 FROM MHX TO CHS. AS SUCH IT MAY BE HARD TO GET MEASURABLE RAINFALL INTO THE CAPE FEAR REGION AND POPS HAVE BEEN TRIMMED. NON-MEASURABLE DRIZZLE/SPRINKLES APPEAR MORE LIKELY. DESPITE THE FAIRLY EXTENSIVE CLOUD COVER AND NE WINDS THE TEMPERATURE CONTINUES TO CLAW ITS WAY SLOWLY UPWARD AND AN EARLIER TEMPTATION TO LOWER HIGH TEMP FCST HAS BEEN TABLED. NO OTHER CHANGES THAN TO AFOREMENTIONED POPS. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... AS OF 300 AM MONDAY...LOW PRESSURE WILL SHIFT FARTHER OFF THE SOUTHEAST COAST AS A SHORTWAVE CONTINUES ITS EASTWARD PROGRESSION. HIGH PRESSURE WILL BUILD IN TUES WITH A DEEP N-NW FLOW OF DRY AIR AS RIDGE BUILDS UP THE EAST COAST. PCP WATER VALUES DROP OFF QUICKLY FROM AROUND 1.5 INCHES TUES MORNING DOWN TO LESS THAN AN INCH BY TUES NIGHT. OVERALL EXPECT CLEARING SKIES WITH PLENTY OF SUNSHINE ACROSS THE AREA BY TUES AFTN AND RUNNING THROUGH WED. MID LEVEL HEIGHT RISES AND SUNNY SKIES WILL YIELD TEMPS UP AROUND 80 ON TUES. DRIER AIR IN PLACE WITH DEWPOINT TEMPS DOWN CLOSE TO 60 AND BELOW OVER INLAND AREAS WILL ALLOW OVERNIGHT TEMPS TO DROP UNDER CLEAR SKIES AND LIGHT WINDS. TEMPS ON WED WILL WARM INTO THE 80S WITH THE AID OF A MORE WESTERLY DOWNSLOPE FLOW ALONG WITH BRIGHT SUNSHINE. && .LONG TERM /THURSDAY THROUGH SUNDAY/... AS OF 300 AM MONDAY...RIDGE CONTINUES TO BUILD UP THE EAST COAST THROUGH THURSDAY AS HIGH PRESSURE WEAKENS AT THE SURFACE. PLENTY OF DRY AIR AND SUBSIDENCE THROUGH THE MID LEVELS WILL PRODUCE ANOTHER MAINLY SUNNY DAY. SOME CONVERGENCE ALONG SEA BREEZE BOUNDARY MAY PRODUCE SOME AFTN CU BUT OVERALL EXPECT MOSTLY SUNNY SKIES WITH TEMPS REACHING UP AROUND 80. BY FRI...HIGH PRESSURE SHIFTS OFF SHORE IN A MORE PROGRESSIVE FLOW. AS THE MID TO UPPER RIDGE SLIPS EAST A TROUGH BEGINS TO DEEPEN AS IT MOVES EAST ACROSS THE GREAT LAKES. AS THIS TROUGH DIGS DOWN IT WILL PUSH A COLD FRONT EAST THROUGH THE CAROLINAS LATE FRI INTO EARLY SATURDAY. THE FLOW REMAINS MORE WESTERLY AND THEREFORE DOES NOT PULL UP MUCH IN THE WAY OF GULF MOISTURE SO EXPECT FRONT TO MOVE THROUGH SOMEWHAT MOISTURE STARVED. THE MAIN UPPER LEVEL DYNAMICS WILL ALSO REMAIN WELL NORTH OF AREA AND THEREFORE SHOULD SQUEEZE OUT A WARM AND SUNNY START TO FRIDAY AND EXPECT PCP TO REMAIN ON THE LOW END WITH BEST CHC FRI EVENING. HIGH PRESSURE WILL BUILD IN BEHIND FRONT THROUGH THE WEEKEND. BY SATURDAY THE MID TO UPPER TROUGH WILL CONTINUE TO DIG SOUTH AS IT SHIFTS EAST. MAIN SHORTWAVE ENERGY RIDING THROUGH THE GREAT LAKES WILL LIFT OFF TO THE NORTHEAST LEAVING A VERY BROAD TROUGH WITH MORE OF A ZONAL FLOW BY SUNDAY. A DEEP COOLER NW FLOW SHOULD PRODUCE BELOW NORMAL TEMPS FOR THE WEEKEND WITH READINGS IN THE MID 70S FOR HIGHS AND LOW TEMPS WILL DROP BELOW NORMAL FOR THE FIRST TIME IN A WHILE IN A VERY DRY AIR MASS WITH DEWPOINT TEMPS DOWN IN THE 50S. OVERALL EXPECT MORE FALL LIKE WEATHER FOR NEXT WEEKEND. && .AVIATION /18Z MONDAY THROUGH SATURDAY/...
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AS OF 18Z...LOOKS LIKE PRECIP TODAY WILL STAY MAINLY INLAND WITH SOME SCATTERED ACTIVITY AT THE MYRTLES. STILL MAINLY A MID CLOUD CEILING THAT THE PRECIP IS COMING OUT OF...HOWEVER BELIEVE PRECIPITATION INDUCED CEILINGS WILL EVENTUALLY COME DOWN...PARTICULARLY TOWARD SUNSET. AM NOT GOING AS LOW AS THE NAM HOWEVER...AS IT HAS BEEN LOWERING CEILINGS TOO MUCH OVER THE PAST WEEK AT LEAST. TONIGHT...CLOUDS WILL BEGIN TO DISSIPATE AND MOVE EAST AS THE FRONT PUSHES TOWARD THE COAST TOWARD MORNING. VFR EXPECTED TUESDAY WITH NORTHEAST FLOW CONTINUING. EXTENDED OUTLOOK...VFR WEDNESDAY AND THURSDAY WITH A CHANCE FOR SHOWERS FRIDAY NIGHT WITH A COLD FRONT. BECOMING VFR SATURDAY WITH MUCH COOLER CONDITIONS.
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&& .MARINE... NEAR TERM /THROUGH TONIGHT/... AS OF 1030 AM MONDAY...N TO NE GRADIENT WINDS IN PLACE THROUGH THE PERIOD AS WEAK HIGH PRESSURE BUILDS IN FROM THE N AND FRONTAL BOUNDARY REMAINS STALLED TO OUR SOUTH. FURTHER OUT TO SEA THE GRADIENT IS QUITE WEAK SO SEAS GENERALLY COMPRISED OF SHORTER PERIOD WIND CHOP IN THE 2 TO 4 FT RANGE. PREVIOUS DISCUSSION... SCATTERED TO NUMEROUS SHOWERS DEVELOPING DURING THE DAY AND PERSISTING THROUGH TONIGHT UNTIL DEVELOPING LOW PRESSURE PULLS FARTHER AWAY FROM THE COAST. N TO NE WIND...GENERALLY AROUND 10 KTS... WILL PREVAIL THROUGH THE EARLY MORNING. THE WIND WILL INCREASE TO AROUND 15 KTS AWAY FROM THE COAST DURING THE DAY...THEN 15 TO 20 KTS ACROSS MOST OF THE WATERS TONIGHT AS LOW PRESSURE EVOLVES OFF THE SOUTHEAST UNITED STATES COAST. SEAS WILL BE 2-3 FT INITIALLY THEN BUILDING TO 4 FT LATER TODAY AND TONIGHT. SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... AS OF 300 AM MONDAY...NORTHEAST WINDS ON THE BACK END OF DEPARTING LOW PRESSURE MOVING FARTHER OFF THE SOUTHEAST COAST THROUGH TUES...WILL INCREASE UP TO 15 TO 20 KTS AS GRADIENT TIGHTENS AS HIGH PRESSURE BUILDS IN BEHIND IT. SEAS WILL INCREASE UP TO 3 TO 5 FT THROUGH TUES BUT WILL COME BACK DOWN TO 2 TO 3 FT BY WED NIGHT AS HIGH PRESSURE SETTLES OVER THE WATERS. LONG TERM /THURSDAY THROUGH FRIDAY/... AS OF 300 AM MONDAY...HIGH PRESSURE WILL WEAKEN THROUGH THURS AND SHIFT OFF SHORE BY FRIDAY WITH AN INCREASING SOUTHERLY RETURN FLOW AS COLD FRONT APPROACHES FROM THE WEST. EXPECT LIGHT AND VARIABLE WINDS THROUGH THURS SHIFTING TO THE SOUTH BY FRI AND INCREASING UP TO 15 KTS BY FRI AFTN AS FRONT DRAWS CLOSER. SEAS DOWN TO 2 TO 3 FT ON THURS WILL INCREASE BACK UP TO 3 TO 4 FT WEDNESDAY ESPECIALLY ACROSS THE OUTER WATERS WITH THE STRONGER WINDS. && .ILM WATCHES/WARNINGS/ADVISORIES... SC...NONE. NC...NONE. MARINE...NONE. && $$ NEAR TERM...MBB SHORT TERM...RGZ LONG TERM...RGZ AVIATION...43

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