419
FXUS62 KGSP 280721
AFDGSP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
321 AM EDT SAT JUN 28 2025
SYNOPSIS
TEMPERATURES NEAR NORMAL THROUGH THE THE FIRST HALF OF NEXT WEEK.
EXPECT AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS EACH DAY. A
WEAK COLD FRONT MAY REACH THE AREA BY TUESDAY WITH TEMPERATURES
WARMING AFTERWARDS.
NEAR TERM /THROUGH TONIGHT/
AS OF 215 AM EDT SATURDAY: RINSE AND REPEAT AS BROAD FLOW AND THE
MORE TYPICAL SUMMERTIME PATTERN CONTINUES. THE BERMUDA HIGH OFF TO
THE EAST STRETCHES A BIT WESTWARD AND ALLOWS SOUTHERLY FLOW TO
REMAIN. THIS KEEPS A SLOW UPTICK OF MOISTURE ADVECTING INTO THE
AREA. GUIDANCE HAS PWATS IN THE 1.5-1.75 RANGE, ESPECIALLY EAST OF
THE MOUNTAINS, MAINTAINING REASONABLE SUMMER DEWPOINTS IN THE UPPER
60S AND VERY LOW 70S. MEANWHILE OVERNIGHT, A FEW AREAS COULD SEE
SOME PATCHY LOW-LEVEL STRATUS OR FOG NEAR DAYBREAK THOUGH CONFIDENCE
IS LOWER GIVEN THE AMOUNT OF CLOUD DEBRIS FROM DECAYING STORMS. IF
ANY SHOULD DEVELOP, EXPECT IT TO CLEAR UP BY DAYBREAK. AS FOR
SATURDAY, EXPECT ANOTHER AFTERNOON OF POP-UP CONVECTION, TYPICAL FOR
THIS TIME OF YEAR. PLENTY OF INSTABILITY ONCE AGAIN AND A STOUT
INVERTED-V, SUPPORTING NEAR 1000 J/KG OF DCAPE, GIVING WAY FOR AN
ENVIRONMENT CAPABLE OF DOWNBURSTS WITH ANY STORM THAT DEVELOPS.
GIVEN THE CALMER WINDS ALOFT, ANY STORM THAT CAN FORM WILL LACK A
STEERING ABILITY AND ARE EXPECTED TO BE OF THE ORDINARY KIND. CANNOT
RULE OUT SOME STRONG WINDS WITH ANY STORM THAT COLLAPSES, BUT IT'S
THE SEASON FOR DIURNAL CONVECTION. MOST OF THE STORMS SHOULD WEAKEN
INTO SATURDAY EVENING AS PEAK HEATING CEASES. DEPENDING ON WHAT
AREAS CAN GET RAIN, THERE IS A CHANCE FOR SOME MORE LOW-LEVEL
STRATUS AND PATCHY FOG AGAIN TONIGHT, ESPECIALLY IN THE MOUNTAIN
VALLEYS. AS FAR AS TEMPERATURES, LOW 90S EAST OF THE MOUNTAINS AND
OVERNIGHT LOWS DIPPING INTO THE LOW 70S.
SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/
AS OF 240 AM SATURDAY: TYPICAL SUMMER-TIME PATTERN WILL REMAIN
IN PLACE OVER THE SOUTHEAST THROUGH THE PERIOD, WITH A WEAKNESS
IN THE SUBTROPICAL RIDGE ATOP THE REGION, AND SOUTHERLY FLOW
AROUND THE WESTERN PERIPHERY OF A BERMUDA HIGH SUPPORTING ABUNDANT
MOISTURE... WITH PRECIPITABLE WATER VALUES OF AROUND 1.75" EXPECTED
THROUGH THE PERIOD. THE SYNOPTIC PATTERN WILL BE SUPPORTIVE OF
CONVECTIVE DEVELOPMENT, WITH ELEVATED MOISTURE AND SEASONAL LEVELS
OF INSTABILITY EXPECTED TO RESULT IN ABOVE-NORMAL COVERAGE OF
DIURNAL SHOWERS AND STORMS EACH AFTERNOON. POPS ARE GENERALLY
ADVERTISED IN THE 60-70% RANGE ACROSS THE MOUNTAINS, AND BETWEEN 40
AND 50% ACROSS THE REMAINDER OF THE FORECAST AREA. WEAK WIND SHEAR
COMBINED WITH ADEQUATE INSTABILITY WILL LIMIT ANY SEVERE STORM
POTENTIAL TO A FEW BRIEF PULSE STORMS. THE LARGER CONCERN WILL
PROBABLY INVOLVE A LOCALLY HEAVY...POSSIBLY EXCESSIVE RAINFALL
THREAT IN LIGHT OF HIGH MOISTURE LEVELS AND VERY SLOW CELL MOVEMENT
OF AROUND 5 KTS. MAX TEMPS WILL BE AROUND NORMAL THROUGH THE PERIOD.
MIN TEMPS WILL REMAIN SEVERAL DEGREES ABOVE CLIMO IN LIGHT OF
ELEVATED SURFACE DEWPOINTS.
LONG TERM /TUESDAY THROUGH FRIDAY/
AS OF 305 AM SATURDAY: A WEAKNESS IN THE SUBTROPICAL RIDGE WILL
BECOME DISPLACED BY MORE OF A UPPER BONA FIDE TROUGH FROM THE
MID-ATLANTIC INTO THE CAROLINAS EARLY IN THE EXTENDED, AS A
SERIES OF SHORT WAVE TROUGHS TRAVERSE THE NORTHEAST QUADRANT OF
THE CONUS AND/OR SOUTHEAST CANADA. ATTENDANT WEAK FRONTAL ZONE
IS FORECAST TO DROP INTO THE FORECAST AREA ON TUESDAY...PROVIDING
A FOCUS FOR ANOTHER DAY OF ENHANCED DIURNAL CONVECTION...WITH AT
LEAST LIKELY POPS ADVERTISED FOR THE BULK OF THE CWA DURING THE
AFTERNOON. SLIGHT ACCELERATION OF THE MID-LEVEL FLOW MAY IMPROVE
SHEAR PROFILES ENOUGH TO SUPPORT MORE IN THE WAY OF CONVECTIVE
CLUSTERING, COMBINING HIGHER COVERAGE/MORE TARGETS OF OPPORTUNITY
TO ALLOW FOR AN UPTICK IN THE SEVERE STORM THREAT, WHILE THE THREAT
FOR LOCALLY EXCESSIVE RAINFALL WILL ALSO CONTINUE.
CONFIDENCE IS GRADUALLY INCREASING THAT THE SURFACE BOUNDARY WILL
MAKE ENOUGH OF A PUSH INTO THE REGION TO ALLOW LOWER THETA-E TO
FILTER INTO THE CWA FOR THE LATTER HALF OF THE WEEK. THIS MAY NOT
BE ENOUGH TO COMPLETELY ELIMINATE THE CONVECTIVE POTENTIAL WED-FRI,
BUT DIURNAL CONVECTIVE COVERAGE IS EXPECTED TO AT LEAST DIMINISH
TO MORE TYPICAL EARLY SUMMER LEVELS...POSSIBLY LESS THAN THAT BY
THU/FRI. TEMPERATURES ARE FORECAST TO REMAIN SLIGHTLY ABOVE CLIMO
THROUGH THE PERIOD.
AVIATION /08Z SATURDAY THROUGH WEDNESDAY/
AT KCLT AND ELSEWHERE: VFR CONDITIONS PREVAIL FOR MOST SITES THROUGH
THE TAF PERIOD. A FEW SCATTERED TSRA AT KCLT AND KHKY ARE CLEARING
AND SHOULD BECOME SKC AFTER 06Z. BR/FG IS ALREADY FORMING IN THE
MOUNTAIN VALLEYS AND MAY APPEAR AT KAVL ONCE AGAIN. THERE IS A
CHANCE THE FEW SCATTERED CLOUDS PASSING OVERHEAD COULD LIMIT THE
AMOUNT. WINDS ARE NOT CALM YET SO THIS WILL ALSO OFFSET THE
DEVELOPMENT OF BR/FG AT THIS POINT. A TEMPO FROM 09Z-12Z SHOULD
SUFFICE. WINDS ARE BECOMING VRB TO CALM EAST OF THE MOUNTAINS AND
SHOULD PICK UP ONCE AGAIN SLOWLY IN THE MORNING OUT OF THE S/SW.
EXPECT NW AT KAVL. ANOTHER ROUND OF AFTERNOON/EVENING SHOWERS AND
TSRA SO PROB30S AT ALL SITES. NO OTHER CIG/VSBY RESTRICTIONS
ANTICIPATED AT THIS TIME.
OUTLOOK: DAILY CHANCES FOR AFTERNOON AND EVENING SHOWERS AND
THUNDERSTORMS INTO NEXT WEEK. FOG AND/OR LOW STRATUS POSSIBLE
EACH MORNING IN THE USUAL MOUNTAIN VALLEYS AS WELL AS NEAR LAKES
AND RIVERS.
GSP WATCHES/WARNINGS/ADVISORIES
GA...NONE.
NC...NONE.
SC...NONE.
SYNOPSIS...CP
NEAR TERM...CP
SHORT TERM...JDL
LONG TERM...JDL
AVIATION...CP
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page