121
WWUS72 KJAX 201630
NPWJAX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1230 PM EDT THU AUG 20 2026
FLZ038-125-132-137-138-232-233-237-325-333-433-533-633-210900-
/O.NEW.KJAX.HT.Y.0026.260821T1500Z-260821T2300Z/
/O.CON.KJAX.HT.Y.0025.000000T0000Z-260820T2300Z/
INLAND FLAGLER-COASTAL DUVAL-EASTERN CLAY-EASTERN PUTNAM-COASTAL
FLAGLER-WESTERN CLAY-NORTHEAST COASTAL ST. JOHNS-WESTERN PUTNAM-
SOUTH CENTRAL DUVAL-SOUTHEAST COASTAL ST. JOHNS-NORTHERN INLAND
ST. JOHNS-SOUTHERN INLAND ST. JOHNS-WESTERN ST. JOHNS-
INCLUDING THE CITIES OF GREEN COVE SPRINGS, ESPANOLA, BOSTWICK,
ORTEGA, ORANGE PARK, PONTE VEDRA BEACH, PALATKA, SAINT AUGUSTINE
BEACH, RIVERSIDE, BUNNELL, ARLINGTON, ANDALUSIA, DOCTORS INLET,
BELLAIR, SAINT AUGUSTINE SHORE, BUTLER BEACH, PICOLATA, SWITZERLAND,
PALM VALLEY, TALLYRAND, PALM COAST, JACKSONVILLE, CARRAWAY, DURBIN,
BAKERSVILLE, SAINT AUGUSTINE SOUTH, LAKESIDE, SAN MARCO, SAINT
AUGUSTINE, ANASTASIA, OCEANWAY, FRUIT COVE, MIDDLEBURG, AND DUPONT
CENTER
1230 PM EDT THU AUG 20 2026
..HEAT ADVISORY IN EFFECT FROM 11 AM TO 7 PM EDT FRIDAY
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING
* WHAT...FOR THE FIRST HEAT ADVISORY, HEAT INDEX VALUES UP TO 112.
FOR THE SECOND HEAT ADVISORY, HEAT INDEX VALUES UP TO 110 EXPECTED.
* WHERE...A PORTION OF NORTHEAST FLORIDA.
* WHEN...FOR THE FIRST HEAT ADVISORY, UNTIL 7 PM EDT THIS EVENING.
FOR THE SECOND HEAT ADVISORY, FROM 11 AM TO 7 PM EDT FRIDAY.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
TAKE EXTRA PRECAUTIONS WHEN OUTSIDE. WEAR LIGHTWEIGHT AND LOOSE
FITTING CLOTHING. TRY TO LIMIT STRENUOUS ACTIVITIES TO EARLY MORNING
OR EVENING. TAKE ACTION WHEN YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE.
TO REDUCE RISK DURING OUTDOOR WORK, THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS IN
SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY HEAT
SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN
EMERGENCY! CALL 9 1 1.
FLZ021-023-024-030-031-035-120-124-136-140-220-225-236-240-322-340-
422-425-522-GAZ153-154-162-163-165-166-264-350-364-202300-
/O.CON.KJAX.HT.Y.0025.000000T0000Z-260820T2300Z/
SUWANNEE-BAKER-INLAND NASSAU-UNION-BRADFORD-GILCHRIST-EASTERN
HAMILTON-COASTAL NASSAU-EASTERN ALACHUA-EASTERN MARION-WESTERN
HAMILTON-TROUT RIVER-WESTERN ALACHUA-CENTRAL MARION-NORTHERN
COLUMBIA-WESTERN MARION-SOUTHEASTERN COLUMBIA-WESTERN DUVAL-
SOUTHWESTERN COLUMBIA-INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-
INLAND CAMDEN-COASTAL CAMDEN-NORTHEASTERN CHARLTON-SOUTHERN WARE-
WESTERN CHARLTON-
INCLUDING THE CITIES OF GAINESVILLE, WEST LAKE, HILLIARD, WOODBINE,
RATLIFF, WINFIELD, DOCK JUNCTION, JASPER, WHITE SPRINGS, SUWANNEE
VALLEY, DOVER BLUFF, FERNANDINA BEACH, GAINESVILLE AIRPORT, COLUMBIA,
GLYNN HAVEN, AMELIA CITY, TARBORO, BELMONT, OCALA AIRPORT,
BRYCEVILLE, WAVERLY, FOLKSTON, SUWANNEE RIVER STATION, HOMELAND,
JENNINGS, BURBANK, SUWANNEE SPRINGS, OLENO STATE PARK, OCALA,
TRENTON, JEKYLL ISLAND, NEEDMORE, YULEE, RACE POND, COLESBURG,
NEWBURN, THALMANN, DUNGENESS, HIGH SPRINGS, LIVE OAK, STEPHEN FOSTER
STATE PARK, ANTHONY, WATERTOWN, BLUE
SPRINGS, ARCHER, ST. SIMONS, ST. GEORGE, HOUSTON, MACCLENNY,
HOMERVILLE, NORMANDY, WINOKUR, KINGS FERRY, STARKE, LYNNE, NEWNANS
LAKE, MCALPIN, NEWBERRY, LAKE CITY, COUNTRY CLUB ESTATE, OLUSTEE,
STATENVILLE, KINGSLAND, WEIRSDALE, LAKE BUTLER, MOSS BLUFF, SEA
ISLAND, LULU, AND NEW RIVER
1230 PM EDT THU AUG 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING
* WHAT...HEAT INDEX VALUES UP TO 111.
* WHERE...PORTIONS OF NORTHEAST AND NORTHERN FLORIDA AND SOUTHEAST
GEORGIA.
* WHEN...UNTIL 7 PM EDT THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
TAKE EXTRA PRECAUTIONS WHEN OUTSIDE. WEAR LIGHTWEIGHT AND LOOSE
FITTING CLOTHING. TRY TO LIMIT STRENUOUS ACTIVITIES TO EARLY MORNING
OR EVENING. TAKE ACTION WHEN YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE.
TO REDUCE RISK DURING OUTDOOR WORK, THE OCCUPATIONAL SAFETY AND
HEALTH ADMINISTRATION RECOMMENDS SCHEDULING FREQUENT REST BREAKS IN
SHADED OR AIR CONDITIONED ENVIRONMENTS. ANYONE OVERCOME BY HEAT
SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN
EMERGENCY! CALL 9 1 1.
FOR MORE INFORMATION, VISIT US AT WWW.WEATHER.GOV/JAX
KB
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