180  
FXUS62 KJAX 171810  
AFDJAX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE JACKSONVILLE FL  
210 PM EDT WED SEP 17 2025  
   
..SEASONABLY WARM TEMPERATURES CONTINUE THROUGH FRIDAY
 
   
..INLAND FOG POTENTIAL EARLY ON THURSDAY AND FRIDAY MORNINGS
 
   
..ANOTHER WEEKEND NOR'EASTER EXPECTED AT COASTAL LOCATIONS
 
 
FOR THE LATEST NE FL AND SE GA DAILY KEY MESSAGES PLEASE VISIT:  
HTTPS://WWW.WEATHER.GOV/MEDIA/JAX/BRIEFINGS/NWS-JAX-BRIEFING.PDF  
   
SYNOPSIS
 
 
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
EARLY AFTERNOON SURFACE ANALYSIS DEPICTS HIGH PRESSURE (1020  
MILLIBARS) THAT WAS SPRAWLING ACROSS THE SOUTHEASTERN STATES,  
WHILE WEAKENING, OCCLUDED LOW PRESSURE (1014 MILLIBARS) WAS  
MOVING SLOWLY NORTHWARD ACROSS THE DELMARVA REGION. MEANWHILE,  
WEAK TROUGHING ASSOCIATED WITH THIS FEATURE EXTENDS ALONG THE GULF  
STREAM WATERS OFF THE SOUTHEASTERN SEABOARD AND ACROSS SOUTH FL.  
ALOFT...CUTOFF TROUGHING CONTINUES TO SPIN OVER THE CHESAPEAKE  
BAY, WITH THE AXIS OF THIS TROUGH EXTENDING INTO EASTERN PORTIONS  
OF THE GULF. THIS WEATHER PATTERN CONTINUES TO CREATE BRISK  
SOUTHWESTERLY FLOW ALOFT ABOVE 500 MILLIBARS (AROUND 20,000 FEET)  
PER THE MORNING SOUNDING AT JACKSONVILLE. OTHERWISE, A SHORTWAVE  
TROUGH EMBEDDED WITHIN THIS DEEP SOUTHWESTERLY FLOW PATTERN WAS  
TRAVERSING THE SOUTHEASTERN GULF, WITH THIS FEATURE DEVELOPING  
CONVECTION OVER THE NORTHWESTERN BAHAMAS AND ACROSS SOUTH FL, THE  
FL KEYS, AND THE SOUTHEASTERN GULF. LATEST GOES-EAST DERIVED TOTAL  
PRECIPITABLE WATER IMAGERY INDICATES THAT AN UNSEASONABLY DRY AIR  
MASS PREVAILS ACROSS MOST OF OUR AREA, WITH PWAT VALUES GENERALLY  
IN THE 1 - 1.25 INCH RANGE FOR SOUTHEAST GA AND NORTHEAST FL,  
WHILE VALUES OF 1.4 - 1.6 INCHES WERE LOCATED TO THE SOUTH OF  
GAINESVILLE IN NORTH CENTRAL FL. A FEW SHOWERS WERE DEVELOPING IN  
THIS MOISTENING AIR MASS ALONG THE INTERSTATE 4 CORRIDOR IN  
CENTRAL FL, WHILE BRISK SOUTHWESTERLY FLOW ALOFT WAS TRANSPORTING  
A VEIL OF HIGH ALTITUDE CIRROSTRATUS THAT WAS EMANATING FROM  
CONVECTION OVER THE SOUTHEAST GULF ACROSS NORTH CENTRAL AND  
NORTHEAST FL. FAIR SKIES PREVAILED ACROSS SOUTHEAST GA, WHILE A  
FLAT CUMULUS FIELD WAS DEVELOPING BENEATH THE CIRROSTRATUS SHIELD  
ACROSS NORTH CENTRAL FL. TEMPERATURES WERE UNIFORMLY IN THE MID TO  
UPPER 80S AT INLAND LOCATIONS AS OF 18Z, WHILE A LIGHT ONSHORE  
BREEZE WAS KEEPING COASTAL TEMPERATURES MOSTLY IN THE LOW TO MID  
80S. DEWPOINTS RANGED FROM THE MID TO UPPER 50S ACROSS INLAND  
PORTIONS OF SOUTHEAST GA AND THE SUWANNEE VALLEY TO THE 60S  
ELSEWHERE.  
 

 
   
NEAR TERM
 
 
(THROUGH TONIGHT)  
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
DEEPER MOISTURE LOCATED TO THE SOUTH OF GAINESVILLE MAY FOSTER  
ISOLATED TO WIDELY SCATTERED SHOWER DEVELOPMENT FROM LATE THIS  
AFTERNOON THROUGH THE EARLY EVENING HOURS ACROSS NORTH CENTRAL FL,  
MOSTLY ALONG THE I-75 CORRIDOR, WHERE THE ATLANTIC AND GULF COAST  
SEA BREEZES COLLIDE. AN OVERALL SUBSIDENT AIR MASS WILL LIKELY  
PREVENT THUNDERSTORM DEVELOPMENT, AND ANY SHOWERS THAT MANAGE TO  
DEVELOP LATER TODAY WILL LIKELY BE BRIEF IN DURATION. MEANWHILE,  
TROUGHING OVER THE SOUTHEASTERN STATES COULD DEVELOP A FEW LIGHT  
SHOWERS OR SPRINKLES OVER INLAND PORTIONS OF SOUTHEAST GA TOWARDS  
SUNSET, BUT THE OVERALL DRY AND SUBSIDENT AIR MASS IN PLACE WILL  
LIKELY PREVENT MEASURABLE RAINFALL ACROSS OUR INTERIOR SOUTHEAST  
GA COUNTIES THIS EVENING. THE CIRROSTRATUS SHIELD STREAMING ACROSS  
NORTH CENTRAL AND NORTHEAST FL IS EXPECTED TO PROGRESS EASTWARD  
AFTER MIDNIGHT, WITH CLEARING SKIES FROM WEST TO EAST SETTING THE  
STAGE FOR PATCHY TO POSSIBLY AREAS OF FOG FORMATION AT INLAND  
LOCATIONS WEST OF THE I-95 CORRIDOR IN NORTHEAST AND NORTH CENTRAL  
FL DURING THE PREDAWN AND EARLY MORNING HOURS, WITH FOG POSSIBLY  
EXTENDING NORTHWARD TO THE OKEFENOKEE SWAMP FOR LOCATIONS SOUTH  
AND EAST OF WAYCROSS. WE WILL CONTINUE TO UNDERCUT MODEL BLEND  
OUTPUT FOR LOW TEMPERATURES TONIGHT GIVEN THE OVERALL DRY AND  
SUBSIDENT AIR MASS IN PLACE, WITH CLEARING SKIES AND RADIATIONAL  
COOLING AFTER MIDNIGHT ALLOWING LOWS TO AGAIN FALL TO THE 60-65  
RANGE FOR MOST INLAND LOCATIONS, RANGING TO THE UPPER 60S TO  
AROUND 70 FOR NORTH CENTRAL FL AND COASTAL LOCATIONS.  
 

 
   
SHORT TERM
 
 
(THURSDAY THROUGH FRIDAY)  
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
PREDOMINANTLY DRY WEATHER CONDITIONS WILL CONTINUE THROUGH THE END  
OF THE WEEK WITH A SLIGHT CHANCE FOR ISOLATED SHOWERS DEVELOPING  
OVER INLAND AREAS DURING THE AFTERNOON HOURS AND THE HIGHEST  
CHANCES FOR CONVECTION OCCURRING OVER NORTH CENTRAL FLORIDA AND  
EXTENDING THOUGH FLAGLER AND ST JOHNS COUNTIES. PREVAILING FLOW  
WILL SHIFT ABOUT TO BECOME MORE OUT OF THE EAST BY THE END OF THE  
PERIOD, BRINGING IN GRADUALLY INCREASING MOISTURE LEVELS GOING  
INTO THE WEEKEND. HIGH TEMPERATURES DURING THIS PERIOD WILL REACH  
UP INTO THE LOWER 90S FOR INLAND AREAS AND IN THE MID 80S FOR  
AREAS ALONG THE COAST. OVERNIGHT LOW TEMPERATURES WILL DROP DOWN  
INTO THE MID TO UPPER 60S FOR INLAND AREAS AND IN THE LOWER 70S  
NEAR THE SHORELINE.  
 

 
   
LONG TERM
 
 
(SATURDAY THROUGH TUESDAY)  
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
PREVAILING FLOW WILL SHIFT TO BECOME MORE OUT OF THE SOUTH BY THE  
BEGINNING OF NEXT WEEK AS HIGH PRESSURE RIDGING TO THE NORTH PULLS  
AWAY AND MOIST AIR WITH PWAT VALUES MEASURING ABOVE 2 INCHES IS  
DRAWN INTO THE FORECAST AREA RESULTING IN INCREASED CHANCES FOR  
MORE WIDESPREAD CONVECTION BY MONDAY AND TUESDAY. HIGH  
TEMPERATURES FOR THE WEEKEND AND INTO THE BEGINNING OF NEXT WEEK  
WILL DROP TO BE SLIGHTLY BELOW THE SEASONAL AVERAGE WITH OVERNIGHT  
LOW TEMPERATURES DROPPING DOWN TO BE NEAR AND SLIGHTLY ABOVE  
AVERAGE FOR THIS TIME OF YEAR.  
 

 
   
AVIATION
 
 
(18Z TAFS)  
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
VFR CONDITIONS WILL PREVAIL AT THE REGIONAL TERMINALS THROUGH AT  
LEAST 04Z THIS EVENING. IFR TO LIFR CONDITIONS ARE EXPECTED TO  
DEVELOP AT VQQ AFTER 05Z, WITH MVFR CONDITIONS EXPECTED TO DEVELOP  
AT GNV TOWARDS 09Z. PERIODS OF IFR CONDITIONS WILL BE POSSIBLE  
AT GNV DURING THE PREDAWN AND EARLY MORNING HOURS, WITH VFR  
CONDITIONS THEN EXPECTED TO PREVAIL AT VQQ AND GNV BY 14Z  
THURSDAY. PERIODS OF MVFR VISIBILITIES WILL ALSO BE POSSIBLE AT  
THE REST OF THE TERMINALS AROUND SUNRISE AFTER HIGH ALTITUDE CLOUD  
COVER DEPARTS DURING THE PREDAWN HOURS, BUT CONFIDENCE WAS TOO  
LOW TO INDICATE FOG FORMATION AT JAX, CRG, SSI, AND SGJ. MAINLY  
EASTERLY SURFACE WINDS SUSTAINED AT 5-10 KNOTS THIS AFTERNOON WILL  
SHIFT TO SOUTHEASTERLY WHILE GRADUALLY WEAKENING THIS EVENING.  
LIGHT AND VARIABLE SURFACE WINDS ARE THEN EXPECTED DURING THE  
EARLY MORNING HOURS BEFORE EAST-NORTHEASTERLY WINDS DEVELOP DURING  
THE MID- MORNING, WITH SUSTAINED SPEEDS INCREASING TO 5-10 KNOTS  
BY 16Z.  
 

 
   
MARINE
 
 
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
WEAK HIGH PRESSURE WILL REMAIN SITUATED OVER OUR REGION THROUGH  
THURSDAY. STRONG HIGH PRESSURE WILL THEN BUILD SOUTHEASTWARD FROM  
HUDSON BAY, CANADA LATE THIS WEEK, WITH THIS FEATURE THEN SHIFTING  
OVER NEW ENGLAND BY SATURDAY AS IT WEDGES DOWN THE SOUTHEASTERN  
SEABOARD. SEAS OF 2-4 FEET WILL PREVAIL BOTH NEAR SHORE AND  
OFFSHORE THROUGH FRIDAY NIGHT. COASTAL TROUGHING WILL SHARPEN  
OVER OUR NEAR SHORE WATERS THIS WEEKEND, RESULTING IN  
STRENGTHENING ONSHORE WINDS, BUILDING SEAS, AND AN INCREASING  
COVERAGE OF SHOWERS AND THUNDERSTORMS. SEAS WILL BUILD TO 3-5 FEET  
ON SATURDAY AS SUSTAINED SPEEDS CLIMB TO CAUTION LEVELS OF 15-20  
KNOTS BOTH NEAR SHORE AND OFFSHORE. SMALL CRAFT ADVISORY  
CONDITIONS ARE POSSIBLE LATE THIS WEEKEND AND EARLY NEXT WEEK, AS  
SEAS LIKELY BUILD TO AT LEAST CAUTION LEVELS OF 4-6 FEET  
THROUGHOUT OUR LOCAL WATERS BY EARLY SUNDAY.  
 
RIP CURRENTS: A LINGERING NORTHEASTERLY SWELL WILL COMBINE WITH  
BREAKERS OF 2-4 FEET AT AREA BEACHES TO KEEP A MODERATE RISK IN  
PLACE THROUGH THURSDAY. STRENGTHENING NORTHEASTERLY WINDS ON  
FRIDAY WILL LIKELY YIELD A HIGHER END MODERATE RISK ON FRIDAY AT  
AREA BEACHES, WITH A HIGH RISK POSSIBLE DURING THE AFTERNOON HOURS  
ALONG THE NORTHEAST FL BEACHES, WHERE SURF HEIGHTS WILL GRADUALLY  
BUILD. A HIGH RISK IS LIKELY THIS WEEKEND AND EARLY NEXT WEEK AS  
ROUGH SURF CONDITIONS PREVAIL.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
AN UNSEASONABLY DRY AIR MASS THIS AFTERNOON WILL DROP MINIMUM  
RELATIVE HUMIDITY VALUES TO THE 30-35 PERCENT RANGE ACROSS INLAND  
SOUTHEAST GA, THE SUWANNEE VALLEY, AND PORTIONS OF NORTH CENTRAL  
FL. LIGHT WESTERLY TRANSPORT WINDS AND ELEVATED MIXING HEIGHTS  
WILL CREATE GOOD DAYTIME DISPERSION VALUES THIS AFTERNOON FOR  
LOCATIONS NORTH OF ALMA IN INTERIOR SOUTHEAST GA. MEANWHILE,  
PREVAILING EASTERLY SURFACE AND TRANSPORT WINDS ACROSS NORTHEAST  
AND NORTH CENTRAL FL WILL COMBINE WITH ELEVATED MIXING HEIGHTS  
ACROSS TO CREATE GOOD DAYTIME DISPERSION VALUES THIS AFTERNOON FOR  
THE SUWANNEE VALLEY AND PORTIONS OF NORTH CENTRAL FL, WHILE FAIR  
VALUES GENERALLY PREVAIL ELSEWHERE. LIGHT AND VARIABLE SURFACE AND  
TRANSPORT WINDS ON THURSDAY WILL RESULT IN POOR TO FAIR DAYTIME  
DISPERSION VALUES FOR MOST OF INLAND SOUTHEAST GA, WHILE EASTERLY  
SURFACE AND TRANSPORT WINDS PERSIST ACROSS NORTHEAST AND NORTH  
CENTRAL FL, WHERE ELEVATED MIXING HEIGHTS WILL GENERALLY YIELD  
GOOD DAYTIME DISPERSION VALUES FOR INLAND LOCATIONS, WITH FAIR  
VALUES FORECAST ELSEWHERE. EAST-NORTHEASTERLY TRANSPORT WINDS WILL  
GRADUALLY STRENGTHEN ON FRIDAY, WITH BREEZY SURFACE WINDS  
DEVELOPING ALONG THE NORTHEAST FL COAST DURING THE AFTERNOON  
HOURS. THESE STRENGTHENING WINDS WILL COMBINE WITH ELEVATED MIXING  
HEIGHTS TO CREATE GOOD DAYTIME DISPERSION VALUES AT MOST  
LOCATIONS.  
 

 
   
COASTAL/TIDAL FLOODING
 
 
ISSUED AT 210 PM EDT WED SEP 17 2025  
 
STRENGTHENING ONSHORE WINDS THIS WEEKEND WILL COMBINE WITH  
MARGINALLY ELEVATED ASTRONOMICAL TIDES TO POTENTIALLY CREATE MINOR  
COASTAL FLOODING ALONG THE ATLANTIC COAST BY LATE SUNDAY OR  
MONDAY. MINOR TIDAL FLOODING WILL ALSO BE POSSIBLE LATE THIS  
WEEKEND AND EARLY NEXT WEEK WITHIN THE ST. JOHNS RIVER BASIN, WITH  
AREAS FROM DOWNTOWN JACKSONVILLE SOUTHWARD EXPECTED TO INITIALLY  
EXPERIENCE WATER LEVEL RISES ON SUNDAY, EXPANDING TO THE REST OF  
THE BASIN AND ITS TRIBUTARIES EARLY NEXT WEEK.  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
AMG 64 91 65 91 / 10 20 0 20  
SSI 70 86 71 85 / 10 10 0 10  
JAX 66 90 69 89 / 10 10 0 10  
SGJ 70 87 72 87 / 10 20 10 10  
GNV 66 93 67 92 / 10 10 0 10  
OCF 67 90 68 91 / 20 20 0 10  
 

 
   
JAX WATCHES/WARNINGS/ADVISORIES
 
 
FL...NONE.  
GA...NONE.  
AM...NONE.  

 
 

 
 
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