Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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FXUS62 KRAH 261735 CCA
AFDRAH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RALEIGH NC
135 PM EDT WED AUG 26 2015

.SYNOPSIS...A STALLED FRONT WILL PERSIST IN VICINITY OF THE CAROLINA
COAST THROUGH THE DURATION OF THE WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
AS OF 1016 AM WEDNESDAY...

AMPLIFIED FLOW REMAINS ACROSS THE CONUS TODAY... WITH TROUGHING IN
THE EAST. FRONT REMAINS NEAR THE CAROLINA COAST... WITH A WEAK
SURFACE WAVE OVER COASTAL SC. DEWPOINTS ARE IN THE 50S OVER THE
WESTERN PART OF THE CWA... AND THE LOW TO MID 70S EAST OF I95 IN
CLOSER PROXIMITY TO THE BOUNDARY. THE BEST CHANCE FOR SCATTERED
SHOWERS AND STORMS REMAINS IN THIS MOISTER AIRMASS... WHERE CAPE IS
PROGGED TO REACH 500-1000 J/KG. HIGHS MID TO UPPER 80S NW TO SE.

SREF PROBABILITIES HINTING AT BETTER COVERAGE OF MVFR CEILINGS IN
THE EAST BY EARLY THURSDAY MORNING. LOWS IN THE LOWER 60S NW TO
UPPER 60S SE.

&&

.SHORT TERM /THURSDAY AND THURSDAY NIGHT/...
AS OF 330 AM WEDNESDAY...

FOR THURSDAY MOST OF THE MODELS HAVE THE FRONTAL BOUNDARY PUSHED A
BIT FURTHER EASTWARD THAN ON WEDNESDAY AND THUS HAVE CONFINED POPS
TO MAINLY THE I-95 CORRIDOR FOR THURSDAY WITH THE MOST ACTIVITY
OCCURRING WITH DAYTIME HEATING. THE GFS ONCE AGAIN HAS SOME SHOWER
ACTIVITY EXPANDING BACK TO THE WEST BUT IT IS HARD TO GIVE THIS MUCH
CREDENCE WITHOUT ANY REAL DISCERNIBLE SHORTWAVE ACTIVITY. IN
ADDITION...AN UPPER LEVEL JET ENTRANCE REGION WILL BE OVER THE CWA
WITH THE FAVORABLE RIGHT ENTRANCE REGION OVER THE EASTERN HALF OF
THE CWA AND THE LESS FAVORABLE LEFT ENTRANCE REGION OVER THE TRIAD.
COUPLE THIS WITH SURFACE HIGH PRESSURE TO THE NORTH AND VERY LITTLE
ISENTROPIC LIFT AND THE RESULT IS A FORECAST SIMILAR TO THE LAST
COUPLE OF DAYS WITH CONVECTIVE ACTIVITY IN THE EAST AND DRIER
CONDITIONS TO THE WEST. HIGHS IN THE LOW TO MID 80S WITH THE HIGHEST
TEMPS MOST LIKELY IN THE SOUTHWESTERN COUNTIES AS SOME LOWER
THICKNESS VALUES WORK INTO THE EASTERN HALF OF THE CWA FROM THE
NORTH. LOWS THURSDAY NIGHT IN THE MID TO UPPER 60S NORTH TO SOUTH.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
AS OF 100 PM WEDNESDAY...

RIDGING OVER THE SOUTHWEST ATLANTIC BEGINS TO RETROGRESS...PUSHING
THE FRONTAL ZONE ALONG THE COAST WESTWARD TO THE NC COAST. THIS
FRONT WILL BE BLOCKED BY SURFACE HIGH PRESSURE BUILDING DOWN THE
ATLANTIC SEABOARD...AND IT WILL CONSEQUENTLY WRAP AROUND THE HIGH
PRESSURE TO PRESENT A SURFACE PATTERN WITH AN APPEARANCE MUCH LIKE A
DAMMING SCENARIO SANS COOLER AIR. THE HIGH PRESSURE HOLDS TIGHT
THROUGH THE WEEKEND...WITH MINIMAL LIFT/FORCING THROUGH LATE
SATURDAY...SO WILL MAINTAIN THE DRY FORECAST THROUGH LATER SATURDAY
WITH HIGHS BOTH FRIDAY AND SATURDAY IN THE MID 80S.

PRECIPITABLE WATER WILL BE ON A GRADUAL INCREASE DUE TO WEAK
ATLANTIC AND GULF MOISTURE ADVECTION...REACHING 1.5 INCHES ON
SUNDAY. MEANWHILE...AN UPPER IMPULSE IS PROGGED TO LIFT OUT OF THE
LOWER MISSISSIPPI AND ACROSS WESTERN NORTH CAROLINA SUNDAY...
PROVIDING SUPPORT FOR INCREASED CONVECTION IN THE WEST...WITH
ACTIVITY SHIFTING TO THE EAST WITH LESS COVERAGE ON MONDAY AS THE
SHORT WAVE LIFTS OUT. HIGHS WILL STILL REACH MID 80S EACH DAY...WITH
UPPER 80S IN THE SOUTH.

UNCERTAINTY INCREASES BY MIDWEEK AS ERIKA OR HER REMAINS WILL
POTENTIALLY BE COMING INTO THE PICTURE. THE SOUTHWEST ATLANTIC UPPER
RIDGE WILL DETERMINE WHERE THE SYSTEM TRACKS...AND WILL KEEP ITS
IMPACT OUT OF THE EQUATION FOR NOW TO AVOID SEE-SAWING THE POPS EACH
MODEL RUN. REGARDLESS...MOIST AND WARM AIRMASS WILL BE IN PLACE
TUESDAY AND WEDNESDAY...WITH HIGHS WAY UP IN THE 80S...PROVIDING
ENOUGH INSTABILITY FOR AT LEAST WIDELY SCATTERED DIURNAL CONVECTION.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
AS OF 134 PM WEDNESDAY...

24 HOUR TAF PERIOD: CONDITIONS ARE VFR... WITH THE EXCEPTION OF MVFR
CIGS REMAINING AT KFAY. EXPECT A BRIEF PERIOD OF IMPROVEMENT THROUGH
TONIGHT BEFORE SUB-VFR STRATUS... AND POTENTIALLY SOME FOG...
REDEVELOP IN THE MORNING HOURS EAST OF THE ROUTE 1 CORRIDOR. KINT
AND KGSO SHOULD REMAIN VFR. ANY STRATUS WILL LIFT IN THE LATE
MORNING HOURS THURSDAY. WINDS WILL REMAIN LIGHT AND NORTHEASTERLY.

LONG TERM: CONDITIONS WILL LIKELY REMAIN PREDOMINATELY VFR THROUGH
THE WEEKEND... WITH THE EXCEPTION OF POSSIBLE MORNING SUB-VFR
STRATUS/FOG. UNCERTAINTY INCREASES LATE IN THE PERIOD WITH THE
APPROACH OF AN UPPER LEVEL WAVE SUNDAY INTO MONDAY... AND THE
POTENTIAL IMPACTS... IF ANY... OF TC ERIKA.

&&

.RAH WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

$$

SYNOPSIS...VINCENT
NEAR TERM...30/ELLIS
SHORT TERM...ELLIS
LONG TERM...MLM
AVIATION...30


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