Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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000 FXUS62 KRAH 221057 AFDRAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RALEIGH NC 657 AM EDT MON SEP 22 2014 .SYNOPSIS...AN UPPER LEVEL LOW DIGGING SOUTHEAST ACROSS THE TENNESSEE VALLEY TODAY WILL STALL OVER THE CAROLINAS TONIGHT THROUGH MID-WEEK AS IT BECOMES CUT-OFF FROM THE NORTHERN BRANCH OF THE JET STREAM. MEANWHILE...A COLD FRONT CROSSING THE AREA THIS MORNING WILL STALL ALONG THE CAROLINA COAST THROUGH WEDNESDAY. && .NEAR TERM /TODAY AND TONIGHT/... AS OF 200 AM MONDAY... TODAY: THE COLD FRONT PROGRESSING INTO THE NW PIEDMONT AT 05Z THIS MORNING WILL TEMPORARILY STALL IN VICINITY OF THE COAST TODAY AS STRONG HEIGHT FALLS /DPVA/ OVERSPREAD THE REGION IN ADVANCE OF POTENT SHORTWAVE ENERGY DIGGING ESE THROUGH THE TN VALLEY. COLD ADVECTION WILL BE PRESENT IN THE WAKE OF THE FRONT TODAY IN MOST AREAS... THOUGH PRIMARILY IN THE N/NW PIEDMONT...WITH HIGHS RANGING FROM THE MID 70S NW TO LOWER 80S SE. EXPECT DRY CONDITIONS IN CENTRAL NC. TONIGHT: PRIOR MODEL GUIDANCE WAS PROGRESSIVE WITH THE APPROACHING SHORTWAVE AND INDICATED IT WOULD MOVE OFFSHORE BY 06-09Z TUE. HOWEVER...THE LATEST GUIDANCE IS MARKEDLY DIFFERENT AND SHOWS A STRONGER/MORE ROBUST WAVE DIGGING FURTHER SOUTH...CLOSING OFF INTO AN UPPER LOW OVER UPSTATE SC TONIGHT...THEN STALLING OVER CENTRAL PORTIONS OF THE CAROLINAS THROUGH TUE AND PERHAPS TUE NIGHT AS IT IS CUT-OFF FROM THE NORTHERN STREAM. ALTHOUGH THE BULK OF CLOUD COVER AND PRECIPITATION ASSOC/W THE UPPER LOW SHOULD REMAIN OVER COASTAL PORTIONS OF THE CAROLINAS TONIGHT...THERE WILL BE A TIGHT GRADIENT IN CLOUD COVER AND PRECIPITATION IN VICINITY OF THE SOUTHEAST COASTAL PLAIN (CUMBERLAND/WAYNE/ SAMPSON)...AND THE FORECAST EAST OF I-95 WILL LIKELY NEED TO ACCOUNT FOR MORE CLOUD COVER THAN PREVIOUSLY EXPECTED...IN ADDITION TO A POTENTIAL FOR LIGHT RAIN TONIGHT IN THE FAR SE COASTAL PLAIN. LOWS WILL RANGE FROM THE UPPER 40S TO LOWER 50S FAR N/NW PIEDMONT TO UPPER 50S FAR SE COASTAL PLAIN. -VINCENT && .SHORT TERM /TUESDAY AND TUESDAY NIGHT/... AS OF 255 AM MONDAY... ...FORECAST RAPIDLY TRENDING CLOUDY/COOLER WITH A CHANCE FOR RAIN... AS MENTIONED IN THE NEAR TERM...THE LATEST MODEL GUIDANCE SUGGESTS THAT ROBUST SHORTWAVE ENERGY APPROACHING THE REGION TODAY WILL DIG FURTHER SOUTH AND AMPLIFY INTO AN UPPER LOW OVER SC TONIGHT... BECOMING CUT-OFF FROM THE NORTHERN STREAM AND STALLING OVER CENTRAL PORTIONS OF THE CAROLINAS THROUGH TUE NIGHT. IN THE LOWER LEVELS... AN INVERTED TROUGH WILL BE PRESENT IN VICINITY OF THE STALLED BAROCLINIC ZONE ALONG OR JUST OFFSHORE THE CAROLINA COAST WHILE AN INVERTED RIDGE EXTENDS SOUTHWARD INTO CENTRAL/WESTERN PORTIONS OF THE CAROLINAS FROM HIGH PRESSURE TO THE NORTH. THE 00Z GFS/NAM KEEP PRECIP LARGELY SOUTH/EAST OF CENTRAL NC TUE/TUE NIGHT...HOWEVER... THE LATEST 00Z ECMWF SHOWS THE COASTAL FRONT MOVING INLAND TUE NIGHT WITH WIDESPREAD PRECIPITATION OVERSPREADING CENTRAL NC FROM THE SOUTH/SE BY WED MORNING. WITH SUCH A LARGE DIFFERENCE IN THE 00Z OPERATIONAL GUIDANCE QPF...FORECAST CONFIDENCE IS BELOW AVERAGE. AT THIS TIME...WILL ADJUST THE FORECAST FOR CENTRAL NC TO REFLECT MOSTLY CLOUDY TO OVERCAST SKIES...COOLER TEMPERATURES (PERHAPS STRUGGLING TO EXCEED THE 60S TUE AFTERNOON) AND A CHANCE FOR RAIN IN THE SOUTHEAST COASTAL PLAIN...THOUGH PRECIP CHANCES MAY NEED TO BE EXTENDED WEST TO INCLUDE THE ENTIRE CWA TUE NIGHT IF THE 12Z GFS/NAM GUIDANCE TRENDS TOWARD THE 00Z ECMWF. -VINCENT && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... AS OF 136 AM MONDAY... THERE ARE STILL A COUPLE OF DIFFERENT MODEL CAMPS WITH REGARD TO THE RAIN CHANCES MID TO LATE WEEK. THE FAVORED EC ENSEMBLES STILL SUGGEST A WEAK CUT OFF MID/UPPER LOW OVER THE SOUTHERN APPALACHIANS WITH A STRONGER INVERTED SURFACE TROUGH NEAR THE COAST. THE MID AND UPPER FLOW BECOMES SE-S WHILE THE LOW LEVEL FLOW REMAINS EASTERLY. THIS SUPPORTS PLENTY OF DEEP MOISTURE AND RAIN CHANCES THU-FRI... BECOMING SUPPRESSED TO THE SE OR COASTAL ZONES BY SAT-SUN. EVEN THOUGH WE ARE TRENDING WITH HIGHER POP WED NIGHT... THU... INTO FRI BASED ON THE FAVORED EC ENSEMBLE MEAN... THE LATEST OPERATIONS GFS REMAINED IN THE OPPOSITE CAMP WITH VERY LOW OR NO POP DURING THE SAME TIME FRAME (WED NIGHT-FRI). THEREFORE... CONFIDENCE REMAINS LOW WITH POP AND QPF. HOWEVER... CONFIDENCE IS INCREASING THERE BEING AN EXTENDED CLOUDY PERIOD DUE TO THE EASTERLY LOW LEVEL FLOW REGARDLESS. SENSIBLE WEATHER FOR WEDNESDAY... VARIABLY CLOUDY EAST AND PARTLY CLOUDY WEST. HIGHS 68-73 (7-10 DEG BELOW NORMAL). BECOMING CLOUDY WED NIGHT... CLOUDY THU-FRI WITH A CHANCE OF RAIN. LOWS 55-62. HIGHS IN THE MID 60S TO MID 70S. MOSTLY CLOUDY TO PARTLY CLOUDY OVER THE WEEKEND. LOWS IN THE 55-60. HIGHS IN THE MID TO UPPER 70S. && .AVIATION /12Z MONDAY THROUGH FRIDAY/...
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AS OF 700 AM MONDAY... 24-HR TAF PERIOD: VFR CONDITIONS WILL PREVAIL TODAY AS A COLD FRONT PROGRESSES THROUGH CENTRAL NC BEFORE STALLING ALONG THE COAST. EXPECT CEILINGS TO REMAIN ABOVE 6 KFT. A LIGHT NORTH/NORTHEAST BREEZE WILL PREVAIL IN THE WAKE OF THE FRONT TODAY INTO TONIGHT. LOOKING AHEAD: THOUGH THE FORECAST IS TRENDING COOLER/CLOUDIER WITH A CHANCE FOR RAIN IN SOUTHEAST PORTIONS OF THE STATE TUE/WED...VFR CONDITIONS ARE LIKELY TO PREVAIL FURTHER INLAND OVER CENTRAL NC WHERE CEILINGS WILL GENERALLY REMAIN AT OR ABOVE 6 KFT. THE EXCEPTION WOULD BE A POTENTIAL FOR A PERIOD OF SUB-VFR CEILINGS AND LIGHT RAIN AT THE RWI/FAY TERMINALS TUE/WED. A NORTHEAST BREEZE WILL PREVAIL THROUGH MID-WEEK. -VINCENT
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&& .RAH WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...VINCENT NEAR TERM...VINCENT SHORT TERM...VINCENT LONG TERM...BADGETT AVIATION...VINCENT

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