Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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000 FXUS62 KRAH 241816 AFDRAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RALEIGH NC 115 PM EST MON NOV 24 2014 .SYNOPSIS...GUSTY SOUTHWEST WINDS WILL BRING WARM TEMPERATURES TODAY. A COLD FRONT WILL CROSS CENTRAL NC THIS EVENING... THEN SETTLE OVER THE EASTERN CAROLINAS OVERNIGHT. LOW PRESSURE WILL FORM OFF THE SOUTHEAST COAST LATE TUESDAY... AND TRACK NORTHEASTWARD ALONG THE CAROLINA COAST WEDNESDAY. && .NEAR TERM /THROUGH TONIGHT/... AS OF 1005 AM MONDAY... REST OF TODAY: VERY MILD TEMPS AND BLUSTERY WINDS REMAIN THE STORY TODAY... WITH LINGERING RAIN CHANCES PERSISTING ACROSS OUR SOUTHEAST SECTIONS. AFTER A WARM START WITH TEMPS HAVING HELD STEADY OR RISEN THROUGH THE NIGHT... LATEST READINGS ARE FIRMLY IN THE 60S EVERYWHERE... AND DESPITE THE VARIABLY TO MOSTLY CLOUDY SKIES (GREATEST/THICKEST CLOUD COVER OVER THE SRN AND ERN CWA)... WE ARE POISED TO PEAK IN THE 70-75 DEGREE RANGE. THIS IS A SLIGHT DOWNWARD BUMP FROM PREVIOUS FORECAST HIGHS... DUE IN LARGE PART TO THE ANTICIPATED PARTIAL CLOUD COVER (AT LEAST) AND CURRENT PACE OF TEMPS... WHICH WILL BE STUNTED TO A 1-2 CATEGORY CLIMB BY THE CLOUD COVER. 20-30% RAIN CHANCES CONTINUE TO LOOK GOOD OVER THE SOUTHEAST THIRD OF THE CWA... WITH THE LATEST HI-RES GUIDANCE IN LINE WITH RADAR TRENDS... BRINGING THE BAND OF SHOWERS AND ISOLATED STORMS NOW OVER SRN/ERN GA INTO ERN SC TOWARD THE NE THROUGH THE AFTERNOON. THE NAM DEPICTS MUCAPE OVER 1000 J/KG BRUSHING OUR ERN CWA... HOWEVER FORECAST SOUNDINGS SHOW THIS TO BE OVERDONE AS ANY LOW LEVEL THERMODYNAMIC LIFT SHOULD BE CAPPED BELOW THE -10C LEVEL... AND THE GFS/RAP LOOK MORE REASONABLE WITH JUST A COUPLE HUNDRED J/KG AT MOST IN THE SE. HAVE HELD ONTO A MENTION OF ISOLATED THUNDER HERE... BUT OTHERWISE ANTICIPATE MERELY SHOWERS. REGARDING WINDS... THE ONSET OF MIXING HAS ALREADY LED TO GUSTS AROUND 20 KTS IN SEVERAL SPOTS... AND FORECAST SOUNDING SUPPORT FREQUENT GUSTS TODAY RANGING FROM AROUND 20 KTS (23 MPH) IN THE SE TO 25 KTS (29 KTS) IN THE NW WHERE THE MIXED LAYER SHOULD BE DEEPER. -GIH TONIGHT...SURFACE COLD FRONT WILL CROSS CENTRAL NC. ASIDE FROM A VEERING LOW LEVEL WIND...FRONTAL PASSAGE WILL OCCUR RELATIVELY UNNOTICED. LOW LEVEL FLOW WILL VEER TO A WEST-NW DIRECTION. UPSTAIRS...850MB TROUGH REMAINS WEST OF THE REGION THROUGH 12Z TUESDAY. SINCE LOW LEVEL FLOW HAS A DOWNSLOPE COMPONENT...INITIAL COLD AIR ADVECTION WILL BE OFFSET OR DELAYED. THUS WILL RAISE MIN TEMPS SEVERAL DEGREES FROM PREVIOUS FORECAST. MIN TEMPS AROUND 50 NW TO NEAR 60 FAR SE. -WSS && .SHORT TERM /TUESDAY THROUGH THURSDAY/... AS OF 313 AM MONDAY... TUESDAY...SURFACE FRONT STALLS OFFSHORE AS IT BECOMES PARALLEL TO SW FLOW ALOFT. THIS FLOW WILL CONTINUE TO STREAM MID-HIGH LEVEL MOISTURE ACROSS CENTRAL NC. A SURFACE WAVE EXPECTED TO DEVELOP ON TEH STALLED OFF THE GA COAST LATES TUESDAY. THIS FEATURE WILL BEGIN TO ADVECT LOW LEVEL MOISTURE INTO OUR REGION TOWARD SUNSET. LIFT ASSOCIATED WITH AN UPPER LEVEL JET EXITING OUR REGION COUPLED WITH THE INCREASINGLY MOIST AIR MASS MAY ALLOW PATCHES OF LIGHT RAIN TO DEVELOP IN VICINITY OF THE SC BORDER PRIOR TO SUNSET. MAX TEMPS TUESDAY DEPENDENT UPON EXTENT OF CLOUD COVERAGE AND EXPECTED ONSET OF SPOTTY LIGHT RAIN. MOS GUIDANCE HAS TRENDED WARMER SO WILL FOLLOW TREND OF UPPER 50S TO AROUND 60 NW TO MID 60S SE. IF CLOUDS THICKER/LOWER THAN CURRENTLY ANTICIPATED....MAX TEMPS CLOSER TO MID 50S NW-LOWER 60S SE MAY BE CLOSER TO REALITY. -WSS TUESDAY NIGHT THROUGH THURSDAY: S/W ENERGY CURRENTLY LOCATED ACROSS THE NORTHWESTERN U.S. WILL DIVE SOUTHEASTWARD INTO THE GULF COAST STATES AND SHIFT EASTWARD AND HELP TO INDUCE CYCLOGENESIS FROM THE GULF OF MEXICO TO ALONG THE SOUTHEAST U.S. COAST ALONG THE STALLED SURFACE FRONT. THE SURFACE LOW WILL LIFT NORTH-NORTHEASTWARD ALONG/NEAR THE MID-ATLANTIC COASTLINE TUESDAY INTO WEDNESDAY.... SPREADING PRECIP ACROSS CENTRAL NC TUESDAY NIGHT INTO WEDNESDAY. MEANWHILE... A 1025 MB SURFACE HIGH LOCATED JUST TO THE NORTH OF THE REGION WILL EXTEND SOUTHWARD INTO CENTRAL NORTH CAROLINA. HOWEVER... THIS SURFACE HIGH WILL NOT DELIVER ANY SIGNIFICANT DRY AIR (ULTRA LOW DEWPOINTS... INSTEAD THE LOWEST DEWPOINTS AHEAD OF ANY PRECIP WILL BE IN THE 30S). WITHOUT THE ULTRA LOW DEWPOINTS IT APPEARS THAT WE WILL NOT HAVE MUCH OF A CHANCE FOR ANY ACCUMULATING SNOW... IF ANY AT ALL... ESPECIALLY AS MODEL GUIDANCE IS TRENDING WARMER WITH THE THERMAL PROFILES ACROSS THE AREA. WHEN THERMAL PROFILES WOULD SUPPORT A POSSIBLE CHANGE OVER... WE WILL BEGIN TO LOSS SATURATION IN THE KEY -10 TO -20 DEGREES CELSIUS LAYER OF THE ATMO. THUS... HAVE REMOVED SNOW FROM THE FORECAST FOR WEDNESDAY... EXPECT IN THE FAR NORTHWEST PIEDMONT ON WEDNESDAY MORNING... WHERE WE WOULD STILL NEED HIGH PRECIP RATES TO ALLOW SOME SNOW TO MIX IN WITH THE RAIN TO OVERCOME AROUND A 3 KFT PLUS ABOVE FREEZING LAYER (SFC-3KFT THAT IS). REGARDLESS TEMPS ARE EXPECTED TO ABOVE TEMPS AND IF WE DO INDEED SEE ANY SNOW MIX IN WE WILL NOT HAVE ANY TRAVEL PROBLEMS. LOWS WEDNESDAY MORNING ARE EXPECTED TO BE IN THE UPPER 30S NW TO LOWER 40S SE. TEMPS ON WEDNESDAY ARE NOT EXPECTED TO RECOVER MUCH WITH WIDESPREAD RAIN EXPECTED FOR WEDNESDAY MORNING INTO THE EARLY AFTERNOON. THUS... WILL ONLY SHOW HIGH TEMPS AROUND 40 N/NW TO THE UPPER 40S SE. A SECOND NORTHERN STREAM DISTURBANCE WILL DIVE SOUTHEASTWARD AND INTO THE BASE OF THE MAIN TROUGH AS IT SHIFTS EASTWARD ACROSS OUR REGION. THE CORE OF THE DISTURBANCE WILL NOT DIVE FAR ENOUGH SOUTH TO BRING ANY APPRECIABLE PRECIP TOO OUR REGION. THUS... WILL KEEP THE FORECAST DRY WEDNESDAY NIGHT INTO THURSDAY FOR NOW. HOWEVER... WE CANT COMPLETELY RULE OUT SOME SPRINKLES/FURRIES OR BRIEF SHOWER ACROSS OUR FAR NORTHERN COUNTIES DURING THIS TIME FRAME. LOWS THURSDAY MORNING ARE EXPECTED TO BE IN THE LOWER TO MID 30S. HIGHS THURSDAY IN THE UPPER 40S TO LOWER 50S. -BSD && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... AS OF 315 AM MONDAY... THURSDAY NIGHT THROUGH SUNDAY: SURFACE HIGH PRESSURE IS EXPECTED TO BUILD INTO THE REGION LATE THIS WEEK... BEFORE SHIFTING TO THE EAST AND SOUTH OF THE AREA FOR THE WEEKEND. THE MID LEVEL FLOW IS EXPECTED TO BECOME MORE FLAT ACROSS OUR AREA... WITH MID LEVEL RIDGING NUDGING NORTHWARD INTO OUR AREA FROM THE SOUTH OVER THE WEEKEND. THIS WILL HELP TO HOLD THE NEXT COLD FRONT TO THE NORTH OF CENTRAL NC THROUGH THE WEEKEND. HIGH TEMPS FRIDAY WILL AGAIN BE IN THE UPPER 40S TO LOWER 50S... BEFORE WARMING OVER THE WEEKEND WITH A WARMING RETURN FLOW. HIGHS FOR THE WEEKEND LOOK TO BE IN THE 50S AND 60S. LOWS DURING THE PERIOD WILL BE ON THE CHILLY SIDE UNTIL THE SURFACE HIGH SHIFTS TO THE EAST AND SOUTH OF THE AREA. THUS... EXPECT LOWS FRIDAY MORNING WILL BE IN THE 20S TO LOWER 30S. LOWS OVER THE WEEKEND WILL GENERALLY BE IN THE 30S TO LOWER 40S. && .AVIATION /18Z MONDAY THROUGH SATURDAY/...
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AS OF 115 PM MONDAY... WHILE VFR CONDITIONS ARE EXPECTED TO HOLD AT INT/GSO THROUGH EARLY TUE AFTERNOON... FARTHER EAST... MVFR CONDITIONS WILL COME AND GO AT RDU/RWI/FAY THROUGH THE REST OF THE AFTERNOON... AND SOME LIGHT RAIN IS POSSIBLE AT FAY. CIGS AT RDU/FAY/RWI ARE EXPECTED TO THEN LIFT TO VFR EARLY THIS EVENING... ALTHOUGH THEY MAY HOLD MVFR LONGER AT FAY. SURFACE WINDS WILL REMAIN FROM THE SW AT SUSTAINED SPEEDS OF 8- 15 KTS WITH PERIODIC GUSTS TO 20-25 KTS THIS AFTERNOON. WINDS WILL SWING AROUND TO WEST THEN NW AND N LATE TONIGHT (BETWEEN 06Z AND 11Z) FROM WEST TO EAST AS A COLD FRONT CROSSES THE REGION. JUST AHEAD OF THE FRONT LATER TONIGHT... DUE TO LIGHTER WINDS AND MOIST AIR NEAR THE GROUND... IFR/LIFR STRATUS MAY FORM AT RWI/FAY IN THE HOURS BEFORE DAYBREAK... ALTHOUGH CONFIDENCE IN THIS IS NOT HIGH AT THIS TIME. VFR CONDITIONS ARE THEN EXPECTED AFTER 13Z TUE WITH NORTH WINDS AND ANY CIGS ABOVE 3K FT AGL. LOOKING BEYOND 18Z TUE... ONCE THE FRONT MOVES TO THE COAST TUE MORNING... A WAVE OF LOW PRESSURE WILL DEVELOP OVER NRN FL EARLY TUE AFTERNOON... AND BEGIN TO TRACK NE ALONG THE COASTAL FRONT. THE BULK OF THE RAIN WITH THIS SYSTEM -- ALONG WITH WIDESPREAD IFR/LIFR CONDITIONS -- IS EXPECTED TO ARRIVE AFTER 00Z WED (EARLY TUE EVENING)... SPREADING NORTH AND WEST ACROSS ALL OF CENTRAL NC TUE EVENING... LASTING THROUGH WED MORNING BEFORE ENDING FROM SW TO NE BY EARLY WED AFTERNOON. WINDS WILL BECOME BRISK AND GUSTY FROM THE NNE AT FAY TUE NIGHT INTO WED MORNING AS THE LOW PRESSURE CENTER TRACKS UP THE NC COAST. VFR CONDITIONS SHOULD BRIEFLY RETURN LATE WED AFTERNOON... HOWEVER PASSAGE OF A CLIPPER LOW PRESSURE CENTER WED EVENING WILL BRING A CHANCE OF SUB-VFR CONDITIONS AND A BRIEF SNOW SHOWER MAINLY TO INT/GSO/RDU/RWI. HIGH PRESSURE WILL THEN BUILD IN FROM THE WEST WITH VFR CONDITIONS EXPECTED THU THROUGH SAT. -GIH
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&& .RAH WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...HARTFIELD NEAR TERM...HARTFIELD/WSS SHORT TERM...WSS/BSD LONG TERM...BSD AVIATION...HARTFIELD

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