Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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000 FXUS62 KRAH 020059 AFDRAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RALEIGH NC 852 PM EDT TUE SEP 1 2015 .SYNOPSIS...
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HIGH PRESSURE WILL REMAIN IN CONTROL TONIGHT AND WEDNESDAY AND THURSDAY. A WEAK COLD FRONT WILL PUSH SOUTH THROUGH THE REGION BRINING COOLER TEMPERATURES THIS WEEKEND.
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&& .NEAR TERM /THROUGH TONIGHT/...
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AS OF 852 PM TUESDAY... THE LATEST SATELLITE DATA INDICATE THAT EVEN THE HIGH THIN CIRRUS WERE THINNING MORE AND DISSIPATING. NOTHING MORE THAN SCATTERED AREAS OF CIRRUS WILL MOVE OVERHEAD OVERNIGHT. A WEAK SURFACE TROUGH REMAINED OVER THE PIEDMONT. DEW POINTS WERE UP CONSIDERABLY INTO THE LOWER TO MID 70S IN ALL BUT PORTIONS OF THE WEST AND NORTH PIEDMONT WHERE SOME UPPER 60S RESIDED. TEMPERATURES AT 900 PM RANGED IN THE MID TO UPPER 70S. THE PROBLEM OF THE NIGHT GIVEN THE EXPECTED FAIR SKIES UNDER HIGH PRESSURE... AND THE HIGH DEW POINTS WILL BE THE GROUND FOG POTENTIAL. CERTAINLY THE HOT SUN THIS AFTERNOON DID SOME EVAPORATION FROM THE RAIN FROM MONDAY ON THE ORDER OF 0.25 TO 0.35. HOWEVER... THERE WAS STILL PLENTY OF RESIDUAL TOP SOIL MOISTURE TO GO AROUND IN 70 PERCENT OF THE AREA. THEREFORE... SOME PATCHY GROUND FOG IS LIKELY... BUT DENSE FOG IS NOT ANTICIPATED AT THIS TIME. LOWS GENERALLY 1-3 DEGREES HIGHER THAN LAST NIGHT YIELDS 68-74.
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&& .SHORT TERM /WEDNESDAY THROUGH THURSDAY/... AS OF 230 PM TUESDAY... THE LOW OVER EAST CENTRAL INDIANA IS EXPECTED TO OPEN UP AND DROP TO THE SE ACROSS OUR REGION LATE WED INTO WED NIGHT. THE NAM DEPICTS 1000-2000 J/KG OF MUCAPE WITH DEEP LAYER SHEAR RISING TO AROUND 25 KTS LATE WED AFTERNOON... NOT GREAT BUT BETTER THAN WE`RE LIKELY TO SEE AT OTHER TIMES THIS WEEK... ALTHOUGH THE NAM MAY BE A TAD TOO HIGH WITH AFTERNOON DEWPOINTS. WITH AN OVERALL WEAK WIND FIELD... LACK OF HIGH-LEVEL FORCING FEATURES... BARELY-NEAR-NORMAL PW... AND VERY LITTLE NEAR-SURFACE MASS CONVERGENCE... DON`T EXPECT ANY SIGNIFICANT SEVERE WEATHER DESPITE THE DPVA ACCOMPANYING THE WAVE`S PASSAGE. FOLLOWING THE TIMING AMONG THE NAM/GFS/SREF/NCAR ENSEMBLE OUTPUT... WILL BRING ISOLATED STORMS INTO THE FAR NW CWA AFTER 18Z... SPREADING INTO THE REST OF THE PIEDMONT AFTER 21Z AND INCREASING TO 20-30%... THEN PROGRESSING TO THE SOUTH AND EAST THROUGH THE EVENING... BEFORE ENDING AS MOSTLY ISOLATED SHOWERS OVER THE FAR SE CWA LATE WED NIGHT. WE SHOULD BE IN A RELATIVE SUBSIDENT AREA POST-WAVE ON THU... WITH THE WEAKENING SHEAR AXIS STRETCHED OVER THE SRN NC BORDER AREA... SO EXPECT ONLY ISOLATED CONVECTION COVERAGE AT MOST. THICKNESSES WILL BE WELL ABOVE NORMAL... SUGGESTING HIGHS AROUND 90 TO 95 BOTH DAYS... IN LINE WITH STATISTICAL GUIDANCE. LOWS WED NIGHT NEAR 70 TO THE LOWER 70S. -GIH && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... AS OF 220 PM TUESDAY... A GENERAL WEAK UPPER LEVEL FLOW PATTERN WILL CHARACTERIZE THE LONG TERM WITH A COUPLE OF SURFACE/LOW LEVEL FEATURES THAT WILL HELP DRIVE SOME OF THE SENSIBLE WEATHER BUT IN GENERAL A LONG TERM FORECAST WROUGHT WITH UNCERTAINTY. AFTER THE SURFACE WAVE MOVES THROUGH THE AREA ON THURSDAY THERE IS NOT A LOT OF FACTORS SUPPORTING THE WETTER GFS SOLUTION OVER NIGHT THURSDAY NIGHT INTO FRIDAY MORNING. PREFER THE EURO SOLUTION KEEPING US DRY OVERNIGHT THURSDAY NIGHT BUT WILL CARRY SLIGHT CHANCE POPS BECAUSE OF THE UNCERTAINTY. SURFACE HIGH PRESSURE OVER NEW ENGLAND WILL BRING A BACK DOOR COLD FRONT THROUGH THE AREA ON FRIDAY EVENING...PROVIDING SOME FORCING FOR BETTER CHANCES FOR SHOWERS AND POTENTIALLY A THUNDERSTORM. HIGH PRESSURE WILL CONTINUE TO SINK SOUTH LATER IN THE WEEKEND AND PRECIP CHANCES WILL DIMINISH OVER THE AREA. TEMPERATURES WILL BE WARM TO BEGIN THE PERIOD WITH HIGHS IN THE LOW 90S AND LOWS AROUND 70 DEGREES. FOR THE WEEKEND...TEMPS WILL DROP TO THE LOW TO MID 80S FOR HIGHS WITH LOWS IN THE MID 60S. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... AS OF 545 PM TUESDAY... 24-HR TAF PERIOD: ASIDE FROM A POTENTIAL FOR MVFR/IFR VISBYS ASSOCIATED WITH FOG DURING THE PRE-DAWN HOURS (08-12Z) WEDNESDAY MORNING AT THE RDU/FAY/RWI TERMINALS...VFR CONDITIONS AND LIGHT/VARIABLE WINDS WILL PREVAIL THROUGH THE TAF PERIOD. LOOKING AHEAD: A POTENTIAL FOR ISOLD CONVECTION WILL BE PRESENT AT ALL TERMINALS AS AN UPPER LEVEL DISTURBANCE (CENTERED NEAR THE IN/OH BORDER AT 21Z THIS AFTERNOON) TRACKS SLOWLY SOUTHEAST THROUGH THE VIRGINIAS INTO PORTIONS OF THE CAROLINAS WED NIGHT/THU MORNING... THOUGH CONFIDENCE IS LOW WITH REGARD TO WHETHER OR NOT CONVECTION WILL EVEN DEVELOP DUE TO POOR DIURNAL TIMING. A SOMEWHAT UNSETTLED PATTERN WILL RESULT IN A POTENTIAL FOR CONVECTION THE REMAINDER OF THE WEEK INTO THIS WEEKEND...PARTICULARLY FRI INTO SAT. -VINCENT && .RAH WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...BADGETT NEAR TERM...BADGETT SHORT TERM...HARTFIELD LONG TERM...ELLIS AVIATION...VINCENT

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