081
WWUS72 KJAX 180450
NPWJAX

URGENT - WEATHER MESSAGE
National Weather Service Jacksonville FL
1250 AM EDT Tue Aug 18 2026

FLZ021-023-024-030-031-035-038-120-124-125-132-136>138-140-220-225-
232-233-236-237-240-322-325-333-340-422-425-433-522-533-633-GAZ153-
154-162-165-166-190000-
/O.CON.KJAX.XH.W.0006.260818T1500Z-260819T0000Z/
Suwannee-Baker-Inland Nassau-Union-Bradford-Gilchrist-Inland
Flagler-Eastern Hamilton-Coastal Nassau-Coastal Duval-Eastern
Clay-Eastern Alachua-Eastern Putnam-Coastal Flagler-Eastern
Marion-Western Hamilton-Trout River-Western Clay-Northeast
Coastal St. Johns-Western Alachua-Western Putnam-Central Marion-
Northern Columbia-South Central Duval-Southeast Coastal St. Johns-
Western Marion-Southeastern Columbia-Western Duval-Northern
Inland St. Johns-Southwestern Columbia-Southern Inland St. Johns-
Western St. Johns-Inland Glynn-Coastal Glynn-Echols-Inland Camden-
Coastal Camden-
Including the cities of Olustee, Dungeness, Palatka, Hilliard, Yulee,
Switzerland, Thalmann, Anastasia, Dover Bluff, Jasper, Starke,
Houston, Burbank, Durbin, Newberry, Dupont Center, Fruit Cove,
Bellair, Green Cove Springs, Doctors Inlet, Ratliff, Riverside,
Arlington, Colesburg, Saint Augustine Beach, San Marco, Columbia,
Kingsland, Fernandina Beach, Ocala Airport, Gainesville, Jennings,
Tarboro, Dock Junction, Suwannee River Station, New River, Ocala,
Palm Valley, Bakersville, Country Club Estate, Newnans Lake, Suwannee
Springs, Lake City, Weirsdale, Saint Augustine South, Middleburg,
Winfield, McAlpin, Jacksonville, Oceanway, Waverly, Butler Beach,
Normandy, Bostwick, Ortega, Blue Springs, Gainesville Airport,
Belmont, Palm Coast, West Lake, Live Oak, Bunnell, Archer, Jekyll
Island, Lynne, Macclenny, Orange Park, Lulu, Newburn, Saint Augustine
Shore, Carraway, Saint Augustine, Watertown, Lakeside, Bryceville,
Amelia City, High Springs, Glynn Haven, Lake Butler,
Tallyrand, Ponte Vedra Beach, Sea Island, Anthony, St. Simons,
Andalusia, Needmore, Espanola, White Springs, Picolata, Kings Ferry,
Trenton, Oleno State Park, Woodbine, Statenville, Suwannee Valley,
and Moss Bluff
1250 AM EDT Tue Aug 18 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
8 PM EDT THIS EVENING...

* WHAT...Dangerously hot conditions with heat index values up to 115
  expected.

* WHERE...Northeast and north central Florida and portions of
  southeast Georgia.

* WHEN...From 11 AM this morning to 8 PM EDT this evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat and high humidity events.

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.

Stay cool, stay hydrated, stay informed.

&&

$$

GAZ132>136-149-151-152-163-250-264-350-364-190000-
/O.CON.KJAX.HT.Y.0023.260818T1500Z-260819T0000Z/
Coffee-Jeff Davis-Bacon-Appling-Wayne-Atkinson-Pierce-Brantley-
Clinch-Northern Ware-Northeastern Charlton-Southern Ware-Western
Charlton-
Including the cities of Willacoochee, Plant Hatch, Waycross, Winokur,
Hazlehurst, Gardi, Homeland, Axson, Race Pond, Pine Grove,
Doctortown, Hoboken, Jesup, Blackshear, Hortense,
Waynesville, Pearson, St. George, Douglas, Folkston, Atkinson,
Raybon, Alma, Needham, Hickox, Baxley, Stephen Foster State Park,
Nahunta, New Lacy, and Homerville
1250 AM EDT Tue Aug 18 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM
EDT THIS EVENING...

* WHAT...Heat index values up to 112 expected.

* WHERE...A portion of southeast Georgia.

* WHEN...From 11 AM this morning to 8 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

NELSON