287 WWUS72 KJAX 171633 NPWJAX URGENT - WEATHER MESSAGE National Weather Service Jacksonville FL 1233 PM EDT Mon Aug 17 2026 GAZ153-154-165-166-180900- /O.NEW.KJAX.XH.W.0006.260818T1500Z-260819T0000Z/ /O.CON.KJAX.XH.W.0005.000000T0000Z-260818T0000Z/ Inland Glynn-Coastal Glynn-Inland Camden-Coastal Camden- Including the cities of Woodbine, Kingsland, Colesburg, Dock Junction, Jekyll Island, Glynn Haven, Thalmann, Country Club Estate, Waverly, Dover Bluff, St. Simons, Dungeness, Sea Island, and Tarboro 1233 PM EDT Mon Aug 17 2026 ...EXTREME HEAT WARNING IN EFFECT FROM 11 AM TO 8 PM EDT TUESDAY... ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values 110 to 115. For the second Extreme Heat Warning, dangerously hot conditions with heat index values 110 to 115 expected. * WHERE...Coastal Camden, Coastal Glynn, Inland Camden, and Inland Glynn Counties. * WHEN...For the first Extreme Heat Warning, until 8 PM EDT this evening. For the second Extreme Heat Warning, from 11 AM to 8 PM EDT Tuesday. * 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. 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. && $$ FLZ021-023-024-030-031-035-038-120-124-125-132-136>138-140-220-225-232-233-236-237-240-322-325-333-340-422-425-433-522-533-633-GAZ162-180900- /O.NEW.KJAX.XH.W.0006.260818T1500Z-260819T0000Z/ /O.CON.KJAX.HT.Y.0022.000000T0000Z-260818T0000Z/ 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-Echols- Including the cities of Saint Augustine South, Fruit Cove, McAlpin, Anastasia, Middleburg, Live Oak, Saint Augustine Shore, Suwannee River Station, Oceanway, Starke, Oleno State Park, Macclenny, Kings Ferry, Bellair, Newnans Lake, Gainesville, Archer, Lake Butler, Houston, Columbia, San Marco, Arlington, Bostwick, Anthony, Olustee, Burbank, High Springs, Tallyrand, Yulee, Suwannee Valley, Espanola, Weirsdale, Fernandina Beach, Normandy, Needmore, Gainesville Airport, Green Cove Springs, Picolata, Lakeside, Lynne, Blue Springs, Saint Augustine, Bunnell, Moss Bluff, Statenville, Bryceville, Ponte Vedra Beach, Ocala Airport, Winfield, Belmont, Butler Beach, Orange Park, Dupont Center, Jacksonville, Bakersville, Jasper, Switzerland, Hilliard, Ortega, Ratliff, Carraway, Saint Augustine Beach, Palm Valley, Riverside, West Lake, Andalusia, Trenton, Doctors Inlet, New River, Jennings, Lulu, Lake City, Newberry, Durbin, Watertown, Suwannee Springs, White Springs, Amelia City, Palatka, Ocala, Newburn, and Palm Coast 1233 PM EDT Mon Aug 17 2026 ...EXTREME HEAT WARNING IN EFFECT FROM 11 AM TO 8 PM EDT TUESDAY... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...For the Heat Advisory, heat index values 108 to 112. For the Extreme Heat Warning, dangerously hot conditions with heat index values 110 to 115 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...For the Heat Advisory, until 8 PM EDT this evening. For the Extreme Heat Warning, from 11 AM to 8 PM EDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. 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. && $$ GAZ132>136-149-151-152-163-250-264-350-364-180900- /O.NEW.KJAX.HT.Y.0023.260818T1500Z-260819T0000Z/ /O.CON.KJAX.HT.Y.0022.000000T0000Z-260818T0000Z/ Coffee-Jeff Davis-Bacon-Appling-Wayne-Atkinson-Pierce-Brantley- Clinch-Northern Ware-Northeastern Charlton-Southern Ware-Western Charlton- Including the cities of Doctortown, St. George, Baxley, Hoboken, New Lacy, Plant Hatch, Hazlehurst, Folkston, Homeland, Race Pond, Jesup, Willacoochee, Waynesville, Gardi, Stephen Foster State Park, Douglas, Waycross, Raybon, Needham, Winokur, Pearson, Hortense, Blackshear, Atkinson, Axson, Pine Grove, Hickox, Alma, Nahunta, and Homerville 1233 PM EDT Mon Aug 17 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT TUESDAY... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...For the first Heat Advisory, heat index values 108 to 112. For the second Heat Advisory, heat index values 108 to 112 expected. * WHERE...A portion of southeast Georgia. * WHEN...For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from 11 AM to 8 PM EDT Tuesday. * 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. 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 HESS