398
FXUS62 KGSP 010622
AFDGSP
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
222 AM EDT TUE APR 1 2025
SYNOPSIS
HIGH PRESSURE WILL BRING DRY AND MILD WEATHER TO THE AREA
TODAY. COOLER TEMPERATURES AND RAIN CHANCES ARE IN STORE FOR PARTS
OF THE AREA WEDNESDAY, WITH THE RAIN CHANCES TAPERING OFF LATE
THURSDAY. DRY AND EXCEPTIONALLY WARM WEATHER END THE WEEK.
NEAR TERM /THROUGH TODAY/
AS OF 2:05 AM EDT TUESDAY: WITH LOW-LEVEL FLOW STILL BACKED MORE
WEST-SOUTHWESTERLY ACROSS THE PIEDMONT, THE FRONT HAS BASICALLY
STALLED AND WINDS HAVE DECOUPLED. THIS COMBINED WITH MOIST GROUND
FROM EARLIER RAINFALL IS RESULTING PATCHY FOG FORMING IN AREAS
WITH CLEAR SKIES. TRIED TO GET MORE FOG MENTION IN THE GRIDS,
BUT STILL THINK NW FLOW SHOULD PICK UP AND START MIXING OUT THE
FOG OVERNIGHT. IN THE HIGHER ELEVATIONS, GUSTY WINDS NW WINDS
ARE EXPECTED INTO THE MORNING AS THE PRESSURE GRADIENT TIGHTENS
AHEAD OF APPROACHING SFC HIGH PRES. LOW TEMPS SHOULD BOTTOM OUT
NEAR NORMAL OVER THE MTNS BUT REMAIN A FEW DEGREES ABOVE NORMAL
OUTSIDE THE MTNS.
OTHERWISE, THE REMNANTS OF THE UPPER TROF/SHORTWAVE WILL LIFT OFF
THE ATLANTIC COAST ON TUESDAY AS BROAD MID/UPPER RIDGING BEGINS TO
BUILD OVER THE SE CONUS. THE RIDGE WILL CONTINUE TO BUILD THRU MID-
WEEK WITH THICKNESSES AND TEMPERATURES INCREASING ACCORDINGLY. AT
THE SFC, THE COLD FRONT WILL MOVE OFFSHORE OVERNIGHT AND INTO TUES
MORNING. IN ITS WAKE, BROAD CANADIAN HIGH PRESSURE WILL SPREAD OVER
OUR AREA FROM THE NW. THIS HIGH WILL BE FAIRLY TRANSITORY AND IS
EXPECTED TO KEEP SLIDING EASTWARD THRU THE NEAR-TERM PERIOD. IT
IS PROGGED TO BE MOVING OVER NEW ENGLAND BY THE END OF THE PERIOD
LATE TUESDAY/EARLY WEDNESDAY WITH LOW-LEVEL FLOW VEERING AROUND
TO ELY ACROSS MOST OF OUR AREA. AS FOR THE SENSIBLE WX, TUESDAY
SHOULD BE DRY WITH TEMPERATURES REBOUNDING BACK ABOVE CLIMATOLOGY
UNDER MOSTLY SUNNY SKIES DESPITE WEAK, NLY LOW-LEVEL WINDS DURING
THE DAY. DEWPTS SHOULD REMAIN IN THE 30S AND 40S ACROSS OUR CWA ON
TUESDAY, WITH RHS DROPPING INTO THE 30 TO 40% RANGE FOR MOST LOCA-
TIONS. AS SUCH, VALUES SHOULD REMAIN ABOVE CRITICAL VALUES FIRE
WX- WISE.
SHORT TERM /TONIGHT THROUGH THURSDAY/
KEY MESSAGES:
1) MOSTLY DRY WEATHER RETURNS WEDNESDAY AND THURSDAY.
2) ABOVE NORMAL TEMPERATURES THURSDAY.
AS OF 155 PM MONDAY: THE SYNOPTIC PATTERN PUTS A STRENGTHENING
TROUGH OUT WEST WITH AN AMPLIFYING RIDGE OVER THE SOUTHEAST.
GUIDANCE FROM THE GFS/EURO BOTH SHOW A STOUT RIDGE EXPANDING OVER
THE CWA WEDNESDAY WITH CONTINUING HEIGHT RISES THROUGH THURSDAY.
THIS IS TRENDING RAINFALL POTENTIAL EVEN DRIER AS THE AREA OF BETTER
LIFT/CONVERGENCE IS OFF THE NW OF THE CWA. GIVEN THE SOUTHERLY
SURFACE FLOW AND AMPLE MOISTURE, CANNOT RULE OUT A POP UP SHOWER
DURING THE SHORT TERM. HOWEVER, THE LOWER QPF RESPONSE KEEPS
CONFIDENCE IN RAINFALL LOW. WILL CAP POPS INTO THE SLIGHT CHANCE
RANGE. WITH THE MOISTURE INCREASING OVER THE AREA, THIS STAVES OFF
MOST FIRE WEATHER CONCERNS AS RH VALUES INCREASE. WINDS ACROSS THE
MOUNTAINS COULD BE BREEZY WEDNESDAY AND THURSDAY AS A TIGHTER
PRESSURE GRADIENT AT THE SURFACE IS PRESENT AS AN AREA OF LOW
PRESSURE LIFTS TO THE NORTH. ADDITIONALLY, THESE HEIGHT RISES BRING
TEMPERATURES WELL ABOVE NORMAL THROUGH THE SHORT TERM AND INTO THE
NEXT.
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/
KEY MESSAGES
1) DRY WEATHER CONTINUES INTO THE WEEKEND AS A STRONG RIDGE BUILDS
ACROSS THE SOUTHEAST
2) TEMPERATURES WARM TO NEAR RECORD HIGHS FRIDAY AND SATURDAY.
3) RAIN CHANCES MAY RETURN SUNDAY WITH A PATTERN CHANGE.
AS OF 200 PM MONDAY: HEIGHT RISES CONTINUE TO TREND TOWARD AN
AMPLIFYING RIDGE OVER THE SOUTHEAST INTO THE WEEKEND. GUIDANCE FROM
THE GFS/EURO AMPLIFY A PERSISTENT RIDGE ACROSS THE SOUTHEAST IN
RESPONSE TO A DEEPENING TROUGH TO THE WEST. SOUTHERLY FLOW REMAINS
DOMINATE DURING THE TIME, SO MOISTURE REMAINS IN THE AREA. DESPITE
THE MOISTURE, MOST OF THE BETTER PRECIPITATION CHANCES REMAIN TO THE
NORTHWEST OF THE CWA THROUGH AT LEAST SATURDAY. BY SUNDAY, HIGH
PRESSURE MOVING DOWN FROM CANADA EXPANDS SOUTHWARD THIS IS HIGHLY
UNCERTAIN SINCE IT'S A WEEK AWAY, BUT THE SIGNALS DO POINT AT A
PATTERN CHANGE. GIVEN THE MOISTURE IN THE REGION, WON'T RULE OUT A
FEW SCATTERED SHOWERS, SO WILL KEEP SLIGHT CHANCE POPS FOR MOST OF
THE EXTENDED. ADDITIONALLY, CONFIDENCE IS INCREASING THAT THE AREA
COULD HAVE TEMPERATURES NEARING RECORDS THIS WEEKEND DEPENDING ON
THE STRENGTH OF THE BUILDING RIDGE.
AVIATION /07Z TUESDAY THROUGH SATURDAY/
AT KCLT AND ELSEWHERE: A COLD FRONT HAS BRIEFLY STALLED ROUGHLY
ACROSS THE PIEDMONT TAF SITES AT TIME OF 06Z TAF ISSUANCE. THE WINDS
HAVE BECOME LIGHT, AND WITH MOIST GROUND FROM EARLIER RAINFALL,
PATCHY FOG AND IFR STRATUS HAS STARTED TO FORM. SOME DRIER AIR IS
EXPECTED TO START WORKING IN OVERNIGHT, WITH AN UPTICK IN WINDS
SHOULD SCATTER OUT THE FOG, BUT CONFIDENCE REMAINS LOW ON HOW
QUICKLY CONDITIONS WILL BECOME AND STAY VFR. AT KAVL, UP-VALLEY
FLOW IS PRODUCING MVFR CIGS, WHICH MAY LINGER THRU DAYBREAK,
BUT SHOULD COMPLETELY CLEAR BY LATE MORNING. FROM THERE, VFR
CONDITIONS ARE EXPECTED THRU THE DAY, AS SFC HIGH PRESSURE BUILDS
IN FROM THE NORTH. EAST OF THE MOUNTAINS, WINDS WILL TOGGLE TO NW
OVERNIGHT, THEN CONTINUE TO VEER TO NE BY DAYBREAK AND SHOULD BE
LIGHT. AT KAVL, WINDS WILL REMAIN NWLY WITH LOW-END GUSTS THRU
MID TO LATE MORNING. WINDS EVERYWHERE WILL TOGGLE TO SE MID TO
LATE AFTN. GENERALLY JUST A FEW HIGH CLOUDS EXPECTED TODAY INTO
TONIGHT. MOISTURE WILL INCREASE OUT OF THE SE LATE TONIGHT AND
MAY PRODUCE AN MVFR OR EVEN IFR CIG AT KCLT BEFORE 12Z WEDNESDAY.
OUTLOOK: A FEW SCT SHOWERS WITH WIDESPREAD MVFR TO IFR CIGS
ARE POSSIBLE ON WEDNESDAY, LINGERING INTO THURSDAY. IFR STRATUS
AND FOG MAY SPREAD IN FROM THE SOUTH THURSDAY NIGHT THRU FRIDAY
MORNING. PREDOMINATELY VFR CONDITIONS EXPECTED FROM FRIDAY THRU
THE WEEKEND.
CLIMATE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 88 1963 31 1936 64 1946 23 1936
KCLT 90 1946 42 1915 62 1986 26 2021
1946
KGSP 87 1967 44 1901 62 2014 27 2021
1963 1993
1946 1902
RECORDS FOR 04-04
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 83 1999 33 1891 61 1893 22 1936
1978
KCLT 87 1999 43 1911 63 1986 29 1936
1899 1945
1934
KGSP 88 1963 44 1936 62 1999 25 1975
1934
RECORDS FOR 04-05
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 86 1909 30 1891 60 2023 20 1944
1910
KCLT 88 1942 38 1891 62 1910 26 1891
KGSP 90 1934 43 1899 60 2023 25 1904
1888
RECORDS FOR 04-06
MAX TEMPERATURE MIN TEMPERATURE
STATION HIGH LOW HIGH LOW
------- ---------- ---------- ---------- ----------
KAVL 88 1967 36 1950 64 2023 22 1898
KCLT 90 2010 43 1931 67 2023 28 1891
1929
KGSP 88 2010 47 1950 65 2023 26 1904
1945
GSP WATCHES/WARNINGS/ADVISORIES
GA...NONE.
NC...NONE.
SC...NONE.
SYNOPSIS...WIMBERLEY
NEAR TERM...ARK/JPT
SHORT TERM...CP
LONG TERM...CP
AVIATION...ARK
CLIMATE...
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