850
FXUS62 KGSP 251050
AFDGSP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
650 AM EDT FRI SEP 25 2026
WHAT HAS CHANGED
THE AVIATION DISCUSSION WAS UPDATED TO REFLECT THE 12Z TAF ISSUANCE.
KEY MESSAGES
1. PATCHY DENSE FOG POSSIBLE ACROSS THE MOUNTAIN VALLEYS AND THE
NORTH CAROLINA FOOTHILLS THROUGH DAYBREAK. BELOW NORMAL HIGHS
RETURN TODAY BEFORE ABOVE NORMAL HIGHS DEVELOP THIS WEEKEND
AND LINGER INTO NEXT WEEK. DRY CONDITIONS PERSIST THROUGH LATE
NEXT WEEK.
DISCUSSION
KEY MESSAGE 1: PATCHY DENSE FOG POSSIBLE ACROSS THE MOUNTAIN VALLEYS
AND THE NORTH CAROLINA FOOTHILLS THROUGH DAYBREAK. BELOW NORMAL
HIGHS RETURN TODAY BEFORE ABOVE NORMAL HIGHS DEVELOP THIS WEEKEND
AND LINGER INTO NEXT WEEK. DRY CONDITIONS PERSIST THROUGH LATE NEXT
WEEK.
THE WEDGE WILL GRADUALLY ERODE THROUGH THE EARLY MORNING HOURS AS
FLOW TURNS MORE N/NW. THE MAIN CONCERN THROUGH DAYBREAK WILL BE THE
POTENTIAL FOR PATCHY TO LOCALLY DENSE FOG TO DEVELOP, MAINLY ACROSS
THE MOUNTAIN VALLEYS AND ACROSS THE NORTH CAROLINA FOOTHILLS.
CONFIDENCE ON FOG FORMATION IS HIGHER FOR THE MOUNTAIN VALLEYS AND
LOWER FOR THE FOOTHILLS.
CYCLONIC FLOW REMAINS ALOFT OVER THE EASTERN US THROUGH EARLY NEXT
WEEK BEFORE UPPER RIDGING BUILDS OVER THE SOUTHEAST MID TO LATE
WEEK. AT THE SURFACE, HIGH PRESSURE WILL ASSERT ITSELF OVER MUCH OF
THE EASTERN CONUS THROUGH MUCH OF NEXT WEEK. A COLD FRONT WILL
APPROACH OUT OF THE WEST MIDDLE OF NEXT WEEK BUT MOISTURE ASSOCIATED
WITH THE FRONT SHOULD REMAIN WEST OF THE GSP FORECAST AREA THROUGH
AT LEAST DAY 7. THE LATEST NBM HAS CHANCE POPS RETURNING BY THURSDAY
BUT THE LATEST GLOBAL MODELS ARE ALL IN AGREEMENT THAT DRY
CONDITIONS SHOULD PERSIST THROUGH AT LEAST THURSDAY. TODAY WILL BE
THE LAST DAY OF BELOW NORMAL HIGHS BEFORE ABOVE NORMAL HIGHS RETURN
THIS WEEKEND AND LINGER THROUGH NEXT WEEK. LOWS THE NEXT FEW NIGHTS
WILL BE COOL AND CRISP, PERFECT FOR EARLY FALL.
AVIATION /12Z FRIDAY THROUGH TUESDAY/
AT KCLT AND ELSEWHERE: WE'VE STILL GOT LINGERING MVFR CIGS
AT KGSP AND KGMU, WITH IFR CIGS AT KAVL. THESE CIGS SHOULD
SCT OUT OVER THE NEXT COUPLE OF HRS WITH DAYTIME HEATING.
SURPRISINGLY, WE HAVE YET TO SEE FOG REALLY DEVELOP IN THE
MTN VALLEYS THIS MORNING, DESPITE THE LIGHT TO CALM WINDS
AND RHS NEAR 100%. THUS, ANY VISBY RESTRICTIONS WERE REMOVED
FROM THE 12Z TAF AT KAVL. OTHERWISE, A MOSTLY CLEAR, DRY DAY
WITH N TO NE WINDS IS EXPECTED TODAY/TONIGHT. WINDS BECOME
LIGHT LATER TONIGHT AND THEN BACK TO A MORE NW DIRECTION
SATURDAY MORNING.
OUTLOOK: DRY, VFR CONDITIONS SHOULD PERSIST INTO THE MIDDLE
OF NEXT WEEK, HOWEVER MTN/RIVER VALLEY FOG/LOW STRATUS WILL
BE POSSIBLE EACH MORNING.
GSP WATCHES/WARNINGS/ADVISORIES
GA...NONE.
NC...NONE.
SC...NONE.
AR/JPT
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