046
FXUS62 KGSP 060012
AFDGSP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
812 PM EDT TUE AUG 5 2025
SYNOPSIS
A WEDGE OF COOL AND MOIST AIR WILL LINGER THROUGH MUCH OF THE WEEK
BEFORE A POTENTIAL COASTAL LOW ERODES THE WEDGE THIS WEEKEND.
ALTHOUGH A WARMING TREND IS EXPECTED TO BEGIN WEDNESDAY, BELOW
NORMAL HIGH TEMPERATURES ARE EXPECTED TO CONTINUE THROUGH THIS
WEEKEND. RAIN CHANCES REMAIN EACH DAY THROUGH THIS WEEK.
NEAR TERM /THROUGH WEDNESDAY/
AS OF 5:35 PM EDT TUESDAY: SHOWER COVERAGE HAS SHIFTED NE OVER THE
PAST FEW HRS AS RAIN RATES HAVE ALSO DIMINISHED ACROSS OUR AREA.
IN ADDITION, WE'RE ACTUALLY SEEING SOME CLEARING OVER FAR WESTERN
NC, ALTHOUGH WE REMAIN SOCKED IN ELSEWHERE. WE STILL EXPECT A LULL
IN PRECIP ACTIVITY THRU THE EVENING AS ISENTROPIC UPGLIDE WEAKENS
OVER OUR AREA. OTHERWISE, A SPRAWLING SFC HIGH WILL SLOWLY SHIFT
OUT OF SOUTHEAST CANADA AND INTO NEW ENGLAND, WHICH WILL KEEP A CAD
PATTERN IN PLACE ACROSS THE WESTERN CAROLINAS AND NORTHEAST GEORGIA
WITH AN INVERTED SFC RIDGE EXTENDING DOWN THE LEE OF THE MTNS.
HEADING INTO TONIGHT, THE LATEST SUITE OF CAMS REMAINS IN DECENT
AGREEMENT THAT A WEAK IMPULSE SWINGING THROUGH THE BASE OF THE BROAD
UPPER TROF SHOULD PROVIDE SUFFICIENT FORCING AND RENEWED ISENTROPIC
ASCENT ATOP THE WEDGE TO INITIATE ANOTHER BATCH OF SHOWERS, ESPECIALLY
ALONG THE I-85 CORRIDOR. A SLIGHT UPTICK IN ELEVATED INSTABILITY ATOP
THE COLD DOME WOULD ALSO SUPPORT EFFICIENT PRECIPITATION RATES WITH
LOCALLY HEAVY RATES POSSIBLE. ADDITIONAL MINOR/NUISANCE FLOODING WILL
BE POSSIBLE THRU THE OVERNIGHT AND INTO THE MORNING, ESPECIALLY IF ANY
HEAVIER SHOWERS OCCUR ACROSS AREAS THAT RECEIVED HEAVY RAIN OVER THE
LAST DAY OR SO. FORCING BECOMES MORE NEBULOUS DURING THE DAY TOMORROW
IN THE WAKE OF THE PASSAGE OF THE AFOREMENTIONED IMPULSE. THE RESULT
WILL BE THE POTENTIAL FOR A SOMEWHAT DRIER PERIOD BY LATE MORNING INTO
THE AFTERNOON AFTER MORNING SHOWERS PUSH OUT OF THE AREA. RAIN CHANCES
WILL BECOME FOCUSED OUTSIDE OF THE WEDGE ACROSS THE SOUTHWEST MTNS
WHERE MORE TRADITIONAL DIURNAL PULSE CONVECTION IS EXPECTED. TEMPERA-
TURES WILL ALSO WARM TOMORROW IN THE ABSENCE OF WIDESPREAD SHOWERS
DURING PEAK HEATING, BUT WILL REMAIN WELL BELOW NORMAL IN THE LOW TO
MID 70S.
SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/
KEY MESSAGES:
1) COLD AIR DAMMING WILL SLOWLY WEAKEN THROUGH THIS PERIOD, BUT HIGH
TEMPERATURES WILL REMAIN BELOW NORMAL.
2) RAIN CHANCES CONTINUE THROUGH THE PERIOD, WITH A TRANSITION TO
MORE OF A DIURNALLY-DRIVEN CONVECTIVE REGIME.
AS OF 1150 AM EDT TUESDAY: SURFACE HIGH PRESSURE POSITIONED OVER THE
NORTHEASTERN STATES WILL MAINTAIN EASTERLY FLOW AND RIDGING ACROSS
OUR AREA FOR WEDNESDAY NIGHT THROUGH FRIDAY. THIS WILL ACT TO KEEP
THE WEDGE IN PLACE, BUT IT SHOULD SLOWLY WEAKEN THROUGH TIME. HIGHS
SHOULD CLIMB BACK INTO LOWER 80S THURSDAY AND FRIDAY IN THE PIEDMONT
AND MOUNTAIN VALLEYS, WHICH IS STILL WELL BELOW CLIMO.
RAINFALL WILL ALSO TREND DOWN OVER THE NEXT COUPLE DAYS WITH A MORE
DIURNAL PATTERN SETTING BACK UP.
LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
KEY MESSAGES
1) WEAK COLD AIR DAMMING LINGERS THROUGH THE WEEKEND.
2) CONFIDENCE IS LOW REGARDING POTENTIAL COASTAL LOW IMPACTS
THIS WEEKEND.
3) FORECAST TEMPERATURES SLOWLY INCREASE BUT REMAIN BELOW NORMAL
UNTIL AT LEAST MONDAY.
AS OF 1205 PM EDT TUESDAY: A SIMILAR PATTERN TO THE SHORT TERM
PERIOD WILL PERSIST INTO THE WEEKEND. A WEAK LOW OFF THE SOUTHEAST
COAST MAY BRING SOME MOISTURE INTO OUR SOUTHEASTERN AREAS, BUT
OTHERWISE EXPECT A DIURNAL SHOWER PATTERN WITH HIGHS REMAINING BELOW
CLIMO.
AVIATION /00Z WEDNESDAY THROUGH SUNDAY/
AT KCLT AND ELSEWHERE: RESTRICTIONS WILL CONTINUE ACROSS THE FCST
AREA THRU THE 00Z TAF PERIOD AS A COLD/COOL AIR DAMMING PATTERN
REMAINS IN PLACE ACROSS THE REGION. WIDESPREAD LOW STRATUS WILL
KEEP CEILINGS PREDOMINATELY IFR THRU THE TAF PERIOD, ALTHOUGH THE
UPSTATE TERMINALS AND KAVL WILL LIKELY IMPROVE TO MVFR SOMETIME
DURING THE AFTERNOON TOMORROW. IN ADDITION, PERIODS OF LIFR WILL
ALSO BE POSSIBLE MOSTLY WITHIN ANY HEAVIER SHOWERS OVERNIGHT AND
INTO THE MORNING. A LULL IN SHOWER ACTIVITY/COVERAGE IS EXPECTED
TO CONTINUE THRU THE EVENING BEFORE ANOTHER ROUND OF SHOWERS MOVES
OVER THE AREA OVERNIGHT AND INTO THE MORNING. THIS WILL BRING ANOTHER
ROUND OF VISBY RESTRICTIONS TO MOST TERMINALS. OTHERWISE, MIST/PATCHY
FOG WILL KEEP VISBY IN THE LOW VFR TO MVFR RANGE OUTSIDE OF SHOWERS.
SHOWER COVERAGE WILL DIMINISH AGAIN LATER TOMORROW MORNING, HOWEVER
ISOLATED TO SCT THUNDERSTORMS WILL BE POSSIBLE DURING THE AFTERNOON,
ESPECIALLY OVER THE MTNS. OUTSIDE THE MTNS, WINDS WILL REMAIN STEADY
AND FROM THE NE THRU THE TAF PERIOD. AT KAVL, WINDS WILL BE LIGHT AND
VRB THRU TOMORROW MORNING. THEY SHOULD PICK UP MARGINALLY FROM THE ESE
TOMORROW AFTERNOON.
OUTLOOK: THE COOL-AIR WEDGE PATTERN IS EXPECTED TO PERSIST OVER OUR
AREA THRU THE WORKWEEK KEEPING RAIN CHANCES AND PERIODIC RESTRICTIONS
IN THE FCST. EMBEDDED THUNDERSTORMS WILL ALSO BE POSSIBLE EACH AFTER-
NOON AND EVENING BUT CONFIDENCE WRT LOCATIONS AND TIMING IS LOW.
GSP WATCHES/WARNINGS/ADVISORIES
GA...NONE.
NC...NONE.
SC...NONE.
SYNOPSIS...SCW
NEAR TERM...JPT/TW
SHORT TERM...SCW
LONG TERM...SCW
AVIATION...JPT
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