300  
FXUS62 KCHS 051132  
AFDCHS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHARLESTON SC  
732 AM EDT SUN OCT 5 2025  
   
SYNOPSIS  
 
STRONG HIGH PRESSURE WILL EXTEND ACROSS THE REGION THROUGH THE  
WEEKEND AND INTO EARLY NEXT WEEK. A STRONG COLD FRONT WILL  
LIKELY CROSS THE AREA LATER NEXT WEEK.  
 
 
   
NEAR TERM /THROUGH TONIGHT/  
 
TODAY: ALOFT, MID-UPPER LVL RIDGING WILL HOLD ACROSS MUCH THE  
MID- ATLANTIC AND SOUTHEAST WHILE H5 VORT ENERGY SHIFTS NORTH  
ACROSS THE GULF AND DEEP SOUTH ALONG ITS WESTERN EDGE. AT THE  
SFC, AN INVERTED TROUGH WILL LINGER OFFSHORE FOR MUCH OF THE DAY  
ALONG THE SOUTHERN PERIPHERY OF HIGH PRESSURE EXTENDING FROM  
THE WESTERN ATLANTIC INTO THE MID-ATLANTIC STATES, ATTEMPTING TO  
HOLD LOCALLY ACROSS THE FAR INTERIOR AND WEST OF THE REGION.  
MUCH LIKE THE PREVIOUS MORNING, SCATTERED TO NUMEROUS COASTAL  
SHOWERS WILL BE DRIVEN ONSHORE WITHIN AN EASTERLY WIND,  
PRODUCING LIGHT TO MODERATE RAINS ACROSS THE SOUTH CAROLINA AND  
GEORGIA COASTAL CORRIDOR, BEFORE BECOMING MORE FOCUSED, BUT  
POSSIBLY WITH LESS COVERAGE ACROSS COASTAL GEORGIA AREAS AND THE  
GEORGIA INTERIOR LATE MORNING INTO THE AFTERNOON. A BREEZY  
EASTERLY WIND IS ANTICIPATED DURING THE AFTERNOON WITH AN  
ENHANCED PRESSURE GRADIENT OCCURRING BETWEEN THE COASTAL TROUGH  
OFFSHORE AND STRONGER HIGH PRESSURE INLAND AND NORTH. WIND GUSTS  
AROUND 20-25 MPH WILL BE COMMON, ESPECIALLY FOR COASTAL AREAS  
ALONG AND EAST OF I-95. A FAIR AMOUNT OF MODEL CONSENSUS  
SUGGESTS A SOMEWHAT DRIER AFTERNOON WITH ACTIVITY MORE SPARSELY  
ONGOING ACROSS SOUTHEAST GEORGIA, BEFORE THE NEXT WAVE OF PRECIP  
ACTIVITY POTENTIALLY DRIFTS ONSHORE AGAIN (INCLUDING ALONG THE  
SOUTH CAROLINA COAST) LATE AFTERNOON/EARLY EVENING. PRIOR TO  
ADDITIONAL DEVELOPMENT, TEMPS SHOULD WARM INTO THE LOW-MID 80S  
AWAY FROM THE IMMEDIATE BEACHES.  
 
TONIGHT: LITTLE CHANGE TO THE PATTERN IS EXPECTED DURING THE  
OVERNIGHT PERIOD IN REGARDS TO A WEAK INVERTED TROUGH PERSISTING  
OFFSHORE AND HIGH PRESSURE PREVAILING TO THE NORTH AND WELL INLAND.  
EXPECT CONDITIONS TO BE QUITE SIMILAR TO THE PREVIOUS NIGHT, WITH  
THE BULK OF CONVECTION SEEN DURING DAYLIGHT HOURS WANING ACROSS LAND  
AND BECOMING MORE FOCUSED ACROSS COASTAL WATERS BY LATE EVENING AND  
OCCURRING THROUGH LATE NIGHT. AN EASTERLY WIND WILL CONTINUE TO  
NUDGE PRECIP ACTIVITY TOWARD COASTAL AREAS LATE NIGHT, PARTICULARLY  
APPROACHING DAYBREAK. FOR THIS REASON, A SLIGHT CHANCE OF  
SHOWERS/THUNDERSTORMS REMAINS IN THE FORECAST ALONG MUCH OF THE  
SOUTH CAROLINA AND GEORGIA COAST. OVERNIGHT LOWS COULD REMAIN A  
DEGREE OR TWO WARMER THAN THE PREVIOUS NIGHT, RANGING IN THE MID-  
UPPER 60S INLAND TO LOW-MID 70S NEAR THE COAST.  
 
 
   
SHORT TERM /MONDAY THROUGH WEDNESDAY/  
 
BROAD UPPER RIDGING PERSISTS MONDAY AND TUESDAY OVER THE SOUTHEAST  
COAST. AT THE SURFACE, ELONGATED HIGH PRESSURE TO THE NORTH AND WEST  
AND PERSISTENT COASTAL TROUGHING KEEPS THE STREAM OF SUBTROPICAL  
MOISTURE ADVECTION GOING, WITH MAINLY SCATTERED SHOWERS CONTINUING  
TO PUSH ONSHORE DURING THE DAY. ADDITIONALLY RAINFALL AMOUNTS WILL BE  
MODEST, WITH MINIMAL IMPACT FROM PURELY RAINFALL. HOWEVER, WITH THE  
THREAT FOR COASTAL FLOODING CONTINUING, ANY RAIN THAT FALLS AROUND  
THE TIMES OF HIGH TIDE COULD EXACERBATE FLOODING IMPACTS FOR VERY  
LOW LYING COASTAL AREAS.  
 
EXPECT LARGELY DRY CONDITIONS TO PREVAIL TUESDAY AND WEDNESDAY AS  
THE SFC RIDGE AXIS SLIDES OVERHEAD, DISRUPTING THE STREAM OF LL  
MOISTURE. THIS WILL ALLOW FOR A BRIEF REPRIEVE IN BREEZY  
NORTHEASTERLY WINDS AS WELL, ESPECIALLY ALONG THE COAST. WEDNESDAY  
LOOKS TO BE THE WARMEST DAY OF THE WEEK WITH SOME INLAND AREAS  
LIKELY APPROACHING 90.  
 
 
   
LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/  
 
H5 HEIGHTS FALL THURSDAY AND FRIDAY AS A SOUTHERN STREAM DIGS TOWARD  
THE SOUTHEAST. AT THE SURFACE, STRONG HIGH PRESSURE BUILDING QUICKLY  
OVER THE NORTHEAST WILL FORCE A BACKDOOR COLD FRONT DOWN THE EASTERN  
SEABOARD, LIKELY CROSSING OUR AREA LATE WEDNESDAY NIGHT OR VERY  
EARLY THURSDAY THEN PUSHING SOUTH AND OFFSHORE. IN TERMS OF  
RAINFALL, OVERALL LOW TO MID LEVEL MOISTURE REMAINS FAIRLY MEAGER,  
WHICH SHOULD KEEP ACCUMULATIONS ON THE LIGHTER SIDE WITH ANY COASTAL  
SHOWER THAT OCCURS WITH FROPA.  
 
GUSTY NE WINDS RETURN THURSDAY INTO FRIDAY BEHIND THE FRONT - 25TH  
TO 75TH PERCENTILE REFLECTING A MOST LIKELY WIND SPEED ALONG THE  
COAST OF AROUND 20-30 MPH - TO END THE WORKWEEK, WHICH, IN ADDITION  
TO ALREADY ELEVATED TIDE LEVELS, COULD BRING A PERIOD OF VERY  
IMPACTFUL TIDAL FLOODING TO END THE WEEK. SEE COASTAL FLOODING  
SECTION FOR MORE.  
 
LATER FRIDAY THROUGH THE WEEKEND REMAINS UNCERTAIN AS ADDITIONAL  
SHORTWAVE ENERGY COULD DEVELOP WAVES WITHIN THE FRONT OFFSHORE,  
BRINGING THE POTENTIAL FOR AN UNSETTLED PERIOD AND CONTINUED WINDY  
CONDITIONS AS RIDGING LIKELY PERSISTS INLAND.  
 
 
   
AVIATION /12Z SUNDAY THROUGH THURSDAY/  
 
TEMPO MVFR/IFR CONDITIONS ARE POSSIBLE WITH LIGHT TO MODERATE  
SHOWERS IMPACTING CHS/JZI/SAV TERMINALS UNTIL 13-15Z THIS  
MORNING. VFR CONDITIONS SHOULD THEN PREVAIL AT CHS/JZI/SAV  
TERMINALS THROUGH 00Z MONDAY. HOWEVER, BRIEF MVFR RESTRICTIONS  
ARE POSSIBLE DURING A SHOWER, MAINLY AT SAV DURING AFTERNOON  
HOURS. EAST-NORTHEAST WINDS ARE EXPECTED TO BECOME BREEZY AT ALL  
TERMINALS LATE SUNDAY MORNING THROUGH MUCH OF SUNDAY AFTERNOON  
WITH GUSTS AROUND 20 KT POSSIBLE. MVFR CIGS SHOULD THEN RETURN  
AT ALL TERMINALS SUNDAY EVENING, BETWEEN THE 03-06Z MONDAY TIME  
FRAME. HAVE INCLUDED PREVAILING MVFR CONDITIONS AT ALL TERMINALS  
BETWEEN 06-12Z MONDAY.  
 
EXTENDED AVIATION FORECAST: LINGERING SHOWER ACTIVITY MONDAY BRINGS  
A LIMITED THREAT FOR BRIEF RESTRICTIONS AT ALL TERMINALS.  
OTHERWISE, NO SIGNIFICANT AVIATION IMPACTS EXPECTED.  
 
 
   
MARINE  
 
TODAY AND TONIGHT: HIGH PRESSURE WILL REMAIN CENTERED NORTH OF THE  
REGION WHILE AN INVERTED TROUGH REMAINS OFFSHORE, LEADING TO AN EAST-  
NORTHEAST FLOW ACROSS LOCAL WATERS ALONG WITH GUSTY SHOWERS AND  
THUNDERSTORMS. A FAIRLY TIGHT PRESSURE GRADIENT WILL PERSIST BETWEEN  
THESE FEATURES, SUPPORTING WIND GUSTS PRIMARILY IN THE 15-20 KT  
RANGE, ALTHOUGH A FEW GUSTS UP TO 25 KT CAN NOT BE RULED OUT. SEAS  
WILL ALSO REMAIN ELEVATED, GENERALLY BETWEEN 4-6 FT NEARSHORE AND 6-  
8 FT ACROSS OUTER GEORGIA WATERS. SMALL CRAFT ADVISORIES WILL  
THEREFORE REMAIN IN PLACE FOR ALL LOCAL WATERS OUTSIDE THE  
CHARLESTON HARBOR TODAY AND TONIGHT.  
 
SUNDAY ONWARD: VERY LONG FETCH EASTERLY WINDS WILL BRING PERSISTENT  
MEDIUM PERIOD SWELL ACROSS THE WATERS, WITH SOME UNDERLYING, BUT  
MUCH SMALLER, LONGER PERIOD SWELL THROUGH EARLY WEEK AS WELL. THE  
SWELL WILL PEAK MONDAY WITH WAVE HEIGHTS REACHING 6-9 FT OFFSHORE,  
BEFORE ONLY GRADUALLY SUBSIDING THROUGH MIDWEEK, WHEN BREEZY NE  
WINDS WILL BEGIN TO EASE AS WELL.  
 
RIP CURRENTS: A HIGH RISK OF RIP CURRENTS WILL CONTINUE THROUGH  
MONDAY IN PRIMARILY MEDIUM PERIOD E TO NE SWELLS.  
 
 
   
TIDES/COASTAL FLOODING  
 
EARLY MORNING: LATEST TIDE OBSERVATIONS AND GUIDANCE SUPPORT  
MINOR/MODERATE COASTAL FLOODING FOR CHARLESTON AND COASTAL COLLETON  
AND POTENTIALLY UP TO MINOR COASTAL FLOODING FROM BEAUFORT COUNTY,  
SC SOUTH TO MCINTOSH COUNTY, GA WITH THE UPCOMING HIGH TIDE  
CYCLE THIS MORNING. A COASTAL FLOOD ADVISORY HAS BEEN ISSUED  
FOR CHARLESTON AND COASTAL COLLETON COUNTY AS A RESULT FOR THE  
UPCOMING HIGH TIDE CYCLE, ~6:46 AM AT CHARLESTON HARBOR, SC. A  
COASTAL FLOOD ADVISORY COULD EVENTUALLY BE NEEDED ACROSS  
SOUTHERN SOUTH CAROLINA AND SOUTHEAST GEORGIA.  
 
ASTRONOMICAL TIDES WILL CONTINUE TO INCREASED THROUGH NEXT WEEK DUE  
TO THE UPCOMING FULL MOON (OCT 7) AND PERIGEE (OCT 8). ADDITIONALLY,  
TIDAL DEPARTURE VALUES WILL REMAIN ELEVATE WITH PERIODS OF BREEZY NE  
WINDS THIS WEEKEND THROUGH MONDAY, THEN AGAIN THURSDAY INTO NEXT  
WEEKEND. AS A RESULT, THE THREAT FOR MAINLY MINOR TO MODERATE  
COASTAL FLOODING WITH EACH HIGH TIDE CYCLES CONTINUES THROUGH MID-  
WEEK. THEN, LATE WEEK, THE THREAT FOR MAJOR COASTAL FLOODING ARRIVES  
WITH THE LATE MORNING HIGH TIDES.  
 
 
   
CHS WATCHES/WARNINGS/ADVISORIES  
 
GA...HIGH RISK FOR RIP CURRENTS THROUGH THIS EVENING FOR GAZ117-119-139-  
141.  
SC...HIGH RISK FOR RIP CURRENTS THROUGH THIS EVENING FOR SCZ048>051.  
COASTAL FLOOD ADVISORY UNTIL 9 AM EDT THIS MORNING FOR SCZ049-  
050.  
MARINE...SMALL CRAFT ADVISORY UNTIL 2 PM EDT TUESDAY FOR AMZ350-352-354.  
SMALL CRAFT ADVISORY UNTIL 6 AM EDT WEDNESDAY FOR AMZ374.  
 
 
 
 
 
NEAR TERM...DPB  
SHORT TERM...CEB  
LONG TERM...CEB  
AVIATION...CEB/DPB  
MARINE...CEB/DPB  
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