467
FXUS62 KGSP 301042
AFDGSP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
642 AM EDT SAT MAY 30 2026
WHAT HAS CHANGED
UPDATED AVIATION DISCUSSION
KEY MESSAGES
1. A POTENTIAL FOR LOCALLY HEAVY RAINFALL AND ISOLATED FLASH
FLOODING CONTINUES TODAY. BRIEFLY COOLER AND DRIER ON SUNDAY
BEFORE RAIN RETURNS MONDAY.
2. DRY AND COOLER THAN NORMAL WEATHER IS EXPECTED TUESDAY THROUGH
AT LEAST THURSDAY. SLIGHTLY WARMER WITH A SMALL CHANCE OF DIURNAL
CONVECTION FRIDAY.
DISCUSSION
KEY MESSAGE 1: A POTENTIAL FOR LOCALLY HEAVY RAINFALL AND ISOLATED
FLASH FLOODING CONTINUES TODAY. BRIEFLY COOLER AND DRIER ON SUNDAY
BEFORE RAIN RETURNS MONDAY.
THE LATEST WATER VAPOR IMAGERY DEPICTS A SHORT WAVE TROUGH MOVING
ACROSS THE DEEP SOUTH, WITH A PLUME OF DEEP MOISTURE EXTENDING FROM
THE CENTRAL GULF NORTHEAST THROUGH THE SAVANNAH RIVER VALLEY INTO
THE SOUTHERN APPALACHIANS. WEAKENING AREAS OF SHOWERS WITH A FEW
ISOLATED STORMS PERSIST WITHIN THIS PLUME ACROSS THE WESTERN PART
OF OUR FORECAST AREA. INDIVIDUAL CELL MOVEMENT HAS BEEN RELATIVELY
PROGRESSIVE, AND THERE HASN'T BEEN MUCH CELL TRAINING OBSERVED, BUT
SMALL CONVECTIVE CLUSTERS HAVE SHOWN SOME TENDENCY TO BACK BUILD,
WHILE THERE HAS ALSO BEEN SOME ANCHORING OF CONVECTION OBSERVED
ALONG TERRAIN FEATURES ALONG THE TN/NC BORDER. THIS HAS RESULTED
IN VERY ISOLATED AREAS OF VERY HEAVY RAINFALL OF 2+ INCHES. THIS
POTENTIAL WILL CONTINUE ACROSS THE HIGH TERRAIN THROUGH THE MORNING,
AND CAN'T RULE OUT A STRAY FLASH FLOOD EVENT.
IF ANYTHING, FORECAST PROFILES SUGGEST A SLIGHT DOWNTICK IN THE
POTENTIAL FOR LOCALLY HEAVY RAIN AND FLASH FLOODING DURING THE
DAYLIGHT HOURS, AS MEAN CLOUD-BEARING WINDS ACCELERATE SLIGHTLY,
AND THE POTENTIAL FOR BACK BUILDING OF CONVECTIVE CLUSTERS
DIMINISHES SOMEWHAT. NEVERTHELESS, AT LEAST SCATTERED SHOWERS
AND SOME THUNDERSTORMS SHOULD PERSIST INTO THE AFTERNOON IN THE
VICINITY OF WEAK FRONTAL BOUNDARY, AND INCREASED INSTABILITY SHOULD
KEEP THE LOW-END FLASH FLOOD THREAT GOING INTO THE AFTERNOON.
BY THIS AFTERNOON, STABLE AIR CIRCULATING AROUND SPRAWLING SURFACE
HIGH PRESSURE BUILDING INTO THE NORTHEAST QUADRANT OF THE COUNTRY
IN THE WAKE OF A CYCLONE DEPARTING THE NEW ENGLAND COAST WILL
SPILL SOUTHWEST DOWN THE EASTERN SLOPES OF THE APPALACHIANS,
WITH INVERTED RIDGE BUILDING INTO OUR FORECAST AREA BY THIS
EVENING. THIS WILL SEND THE SURFACE BOUNDARY SOUTHWEST THROUGH THE
CWA AND BRING AN END TO CONVECTION FOR MUCH OF THE AREA BY THE
END OF THE EVENING. COOL/STABLE CONDITIONS PERSIST INTO SUNDAY,
WITH TEMPERATURES AROUND 10 DEGREES BELOW NORMAL FORECAST FOR MUCH
OF THE AREA OUTSIDE THE MOUNTAINS. SUNDAY POPS ARE LIMITED TO THE
WESTERN AND SOUTHERN PERIPHERY OF THE CWA, WHERE SOME AFTERNOON
INSTABILITY IS POSSIBLE...ESPECIALLY ACROSS THE MOUNTAINS CLOSER
TO THE TN BORDER.
MOISTURE BEGINS TO INCREASE YET AGAIN SUN NIGHT INTO
MONDAY...BETWEEN SURFACE HIGH OFF THE SOUTHEAST COAST, AND AHEAD
OF APPROACHING COLD FRONT ASSOCIATED WITH AN AREA OF HEIGHT FALLS
DIVING FROM THE GREAT LAKES INTO THE CENTRAL APPALACHIANS. POPS
WILL ONCE AGAIN RAMP UP SUNDAY NIGHT AND ESPECIALLY MONDAY. DRYING
WITH A LITTLE MORE STAYING POWER FINALLY ARRIVES (FOR THE MOST
PART) MONDAY EVENING. OTHER THAN THE BELOW-NORMAL TEMPS SUNDAY,
TEMPERATURES ARE FORECAST TO BE NEAR-NORMAL THROUGH MONDAY NIGHT.
KEY MESSAGE 2: DRY AND COOLER THAN NORMAL WEATHER IS EXPECTED TUESDAY
THROUGH AT LEAST THURSDAY. SLIGHTLY WARMER WITH A SMALL CHANCE OF
DIURNAL CONVECTION FRIDAY.
ANOMALOUSLY LOW HEIGHT ARE FORECAST TO PERSIST NEAR THE EAST COAST
THROUGH MUCH OF THE NEW WORK WEEK, MAINTAINING GENERAL LOW LEVEL/DRY
RIDGING AND COOLER-THAN-NORMAL TEMPS THROUGH AT LEAST THURSDAY. A
SHORT WAVE TROUGH IS FORECAST TO DIG DOWN THE WESTERN PERIPHERY OF
THE TROUGH AND INTO THE FORECAST AREA TUESDAY. THE LATEST GFS IS
ESPECIALLY STRONG WITH THIS FEATURE AND RESPONDS WITH A ROUND OF
CONVECTION TUE AFTERNOON. THIS IS GENERALLY AT ODDS WITH THE OTHER
GLOBAL MODELS, BUT IT NEVERTHELESS SEEMS PRUDENT TO ADVERTISE A
SMALL POP. DRY WEATHER WITH TEMPS AROUND 5 DEGREES BELOW CLIMO ARE
OTHERWISE FORECAST THROUGH THURSDAY. TEMPERATURES AND MOISTURE ARE
FORECAST TO INCREASE TO NEAR-NORMAL BY FRIDAY, AND SMALL CHANCES
FOR DIURNAL CONVECTION ARE WARRANTED FOR THE END OF THE WEEK.
AVIATION /12Z SATURDAY THROUGH WEDNESDAY/
AT KCLT AND ELSEWHERE: SHOWERS PERSIST ACROSS THE NC PORTION OF THE
TERMINAL FORECAST AREA THIS MORNING. IN THE IMMEDIATE NEAR TERM,
SHOWER POTENTIAL IS EXPECTED TO BE CONFINED TO THE NC TAF SITES,
AND TEMPOS FOR SHRA (WITH TSRA AT KCLT) ARE CARRIED THERE THIS
MORNING. WITH SOME HEATING ANTICIPATED FROM LATE MORNING INTO
THE AFTERNOON, SCATTERED TS ARE EXPECTED TO DEVELOP ACROSS THE
SOUTHERN HALF OF THE AREA IN THE VICINITY OF A EAST/WEST ORIENTED
COLD FRONT AND ALONG TERRAIN FEATURES. PROB30S FOR TSRA ARE CARRIED
AT THE UPSTATE SC TERMINALS AS WELL AS KAVL DURING THE AFTERNOON.
OUTSIDE OF TEMPOS, VFR CONDITIONS ARE FORECAST, ALBEIT WITH PLENTY
OF CIGS ON THE LOWER SIDE OF VFR. HOWEVER, A BRIEF RESTRICTION IS
POSSIBLE IN LOW CIGS AT KAND THIS MORNING, WHERE SOME RAIN DID FALL
LAST EVENING.
COVERAGE OF CONVECTION IS FORECAST TO WANE QUICKLY THIS EVENING,
AS MORE STABLE AIR BEGINS PUSHING IN FROM ON NE WINDS INCREASING TO
5-10 KTS. IN THE INTERIM, WINDS ARE MAINLY EXPECTED TO BE LIGHT SW
OR LIGHT/VARIABLE. NE WINDS MAY BECOME GUSTY AT THE PIEDMONT
TERMINALS BY DAYBREAK SUNDAY. WHILE VFR IS FORECAST AT ALL TAF SITES
TOMORROW MORNING, THERE IS SOME POTENTIAL FOR FOG/LOW STRATUS AT THE
UPSTATE SC TERMINALS AND KAVL, WHERE THE DRY AIR WILL NOT BE AS
DEEP.
OUTLOOK: DRIER CONDITIONS CONTINUE INTO SUNDAY BEFORE ANOTHER COLD
FRONT BRINGS CONVECTIVE CHANCES BACK MONDAY. A DRIER PATTERN SHOULD
RETURN FOR THE REST OF THE WORKWEEK.
GSP WATCHES/WARNINGS/ADVISORIES
GA...NONE.
NC...NONE.
SC...NONE.
JDL
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