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Home Return to list Heat Advisory 0001 Issued by the Austin / San Antonio Forecast Office
Action: New Issued At: 2026-06-17 00:04:44 794 WWUS74 KEWX 170504 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 1204 AM CDT Wed Jun 17 2026 TXZ173-191>194-203>209-217>225-228-172100- /O.CON.KEWX.XH.W.0001.260618T1700Z-260619T0100Z/ Williamson-Hays-Travis-Bastrop-Lee-Uvalde-Medina-Bexar-Comal- Guadalupe-Caldwell-Fayette-Maverick-Zavala-Frio-Atascosa-Wilson- Karnes-Gonzales-De Witt-Lavaca-Dimmit- Including the cities of Lockhart, Carrizo Springs, Austin, Giddings, La Grange, Hallettsville, Georgetown, Gonzales, Seguin, Floresville, Crystal City, Hondo, Bastrop, Pleasanton, Eagle Pass, San Marcos, San Antonio, Uvalde, Cuero, Karnes City, New Braunfels, and Pearsall 1204 AM CDT Wed Jun 17 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TO 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 112 expected. * WHERE...The Hill Country, Edwards Plateau, and northern Rio Grande Plains. * WHEN...From noon to 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Little in the way of extreme heat has been observed so far this Summer. The risk will be higher with little time to adjust to the extreme heat. 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. Do not leave young children or 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. && $$ TXZ171-172-183>190-202-172100- /O.NEW.KEWX.HT.Y.0001.260618T1700Z-260619T0100Z/ Llano-Burnet-Val Verde-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Kinney- Including the cities of Fredericksburg, Burnet, Boerne, Blanco, Leakey, Llano, Kerrville, Del Rio, Brackettville, Rocksprings, and Bandera 1204 AM CDT Wed Jun 17 2026 ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT THURSDAY... * WHAT...Heat index values up to 110 expected. * WHERE...A portion of south central Texas. * WHEN...From noon to 8 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ MM Action: Continued Issued At: 2026-06-17 15:43:26 468 WWUS74 KEWX 172042 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 342 PM CDT Wed Jun 17 2026 TXZ173-191>194-203>209-217>225-228-181200- /O.CON.KEWX.XH.W.0001.260618T1700Z-260619T0100Z/ Williamson-Hays-Travis-Bastrop-Lee-Uvalde-Medina-Bexar-Comal- Guadalupe-Caldwell-Fayette-Maverick-Zavala-Frio-Atascosa-Wilson- Karnes-Gonzales-De Witt-Lavaca-Dimmit- Including the cities of San Antonio, Karnes City, Crystal City, San Marcos, Seguin, Gonzales, Pearsall, Eagle Pass, Floresville, Bastrop, La Grange, Hondo, Lockhart, New Braunfels, Uvalde, Austin, Giddings, Carrizo Springs, Georgetown, Cuero, Hallettsville, and Pleasanton 342 PM CDT Wed Jun 17 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TO 8 PM CDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values up to 115 expected. * WHERE...The I-35 corridor, Coastal Plains, and southern Rio Grande Plains. * WHEN...From noon to 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Conditions Thursday will be more extreme than the heat so far this summer. The risk of heat related illnesses will be higher with little time to adjust to the extreme heat. 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. Do not leave young children or 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. && $$ TXZ171-172-183>190-202-181200- /O.CON.KEWX.HT.Y.0001.260618T1700Z-260619T0100Z/ Llano-Burnet-Val Verde-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Kinney- Including the cities of Leakey, Llano, Del Rio, Boerne, Brackettville, Rocksprings, Burnet, Kerrville, Bandera, Blanco, and Fredericksburg 342 PM CDT Wed Jun 17 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TO 8 PM CDT THURSDAY... * WHAT...Heat index values up to 112 expected. * WHERE...The Hill Country, Edwards Plateau, and northern Rio Grande Plains. * WHEN...From noon to 8 PM CDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Conditions Thursday will be more extreme than the heat so far this summer. The risk of heat related illnesses will be higher with little time to adjust to the extreme heat. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ TRAN Action: Continued Issued At: 2026-06-18 02:30:12 324 WWUS74 KEWX 180729 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 229 AM CDT Thu Jun 18 2026 TXZ173-191>194-203>209-217>225-228-190100- /O.CON.KEWX.XH.W.0001.260618T1700Z-260619T0100Z/ Williamson-Hays-Travis-Bastrop-Lee-Uvalde-Medina-Bexar-Comal- Guadalupe-Caldwell-Fayette-Maverick-Zavala-Frio-Atascosa-Wilson- Karnes-Gonzales-De Witt-Lavaca-Dimmit- Including the cities of Crystal City, Hallettsville, Carrizo Springs, Lockhart, Seguin, Cuero, Karnes City, Bastrop, San Antonio, Giddings, Uvalde, New Braunfels, Floresville, Hondo, Pleasanton, Austin, Gonzales, San Marcos, Georgetown, Pearsall, Eagle Pass, and La Grange 229 AM CDT Thu Jun 18 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values of 113-118 expected. * WHERE...A portion of south central Texas. * WHEN...From noon today to 8 PM CDT 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. Do not leave young children or 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. && $$ TXZ171-172-183>190-202-190100- /O.CON.KEWX.HT.Y.0001.260618T1700Z-260619T0100Z/ Llano-Burnet-Val Verde-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Kinney- Including the cities of Kerrville, Brackettville, Bandera, Fredericksburg, Blanco, Rocksprings, Llano, Boerne, Leakey, Del Rio, and Burnet 229 AM CDT Thu Jun 18 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING... * WHAT...Heat index values from 108-112 expected. * WHERE...A portion of south central Texas. * WHEN...From noon today to 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ MM Action: Time Extended Issued At: 2026-06-18 19:29:23 100 WWUS74 KEWX 190028 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 728 PM CDT Thu Jun 18 2026 TXZ173-191>194-203>209-217>225-228-190200- /O.EXT.KEWX.XH.W.0001.000000T0000Z-260619T0200Z/ Williamson-Hays-Travis-Bastrop-Lee-Uvalde-Medina-Bexar-Comal- Guadalupe-Caldwell-Fayette-Maverick-Zavala-Frio-Atascosa-Wilson- Karnes-Gonzales-De Witt-Lavaca-Dimmit- Including the cities of New Braunfels, Crystal City, Seguin, La Grange, Lockhart, Gonzales, Karnes City, Hondo, Pleasanton, Georgetown, Floresville, Austin, Eagle Pass, Pearsall, Cuero, Hallettsville, San Antonio, Carrizo Springs, Uvalde, San Marcos, Bastrop, and Giddings 728 PM CDT Thu Jun 18 2026 ...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 116. * WHERE...A portion of south central Texas. * WHEN...Until 9 PM CDT 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. Do not leave young children or 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. && $$ TXZ171-172-183>190-202-190200- /O.EXT.KEWX.HT.Y.0001.000000T0000Z-260619T0200Z/ Llano-Burnet-Val Verde-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Kinney- Including the cities of Leakey, Kerrville, Bandera, Fredericksburg, Del Rio, Burnet, Llano, Boerne, Blanco, Rocksprings, and Brackettville 728 PM CDT Thu Jun 18 2026 ...HEAT ADVISORY NOW IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...Heat index values up to 110. * WHERE...A portion of south central Texas. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ 05 Action: Expired Issued At: 2026-06-18 21:05:42 673 WWUS74 KEWX 190205 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 905 PM CDT Thu Jun 18 2026 TXZ173-191>194-203>209-217>225-228-190315- /O.EXP.KEWX.XH.W.0001.000000T0000Z-260619T0200Z/ Williamson-Hays-Travis-Bastrop-Lee-Uvalde-Medina-Bexar-Comal- Guadalupe-Caldwell-Fayette-Maverick-Zavala-Frio-Atascosa-Wilson- Karnes-Gonzales-De Witt-Lavaca-Dimmit- Including the cities of New Braunfels, Crystal City, Seguin, La Grange, Lockhart, Gonzales, Karnes City, Hondo, Pleasanton, Georgetown, Floresville, Austin, Eagle Pass, Pearsall, Cuero, Hallettsville, San Antonio, Carrizo Springs, Uvalde, San Marcos, Bastrop, and Giddings 905 PM CDT Thu Jun 18 2026 ...EXTREME HEAT WARNING HAS EXPIRED... As temperatures cool, the heat indices have mostly dropped below warning criteria. We have allowed the Excessive Heat Warning to expire. Its still unusually hot, so please exercise caution. $$ TXZ171-172-183>190-202-190315- /O.EXP.KEWX.HT.Y.0001.000000T0000Z-260619T0200Z/ Llano-Burnet-Val Verde-Edwards-Real-Kerr-Bandera-Gillespie- Kendall-Blanco-Kinney- Including the cities of Leakey, Kerrville, Bandera, Fredericksburg, Del Rio, Burnet, Llano, Boerne, Blanco, Rocksprings, and Brackettville 905 PM CDT Thu Jun 18 2026 ...HEAT ADVISORY HAS EXPIRED... As temperatures cool, the heat indices have mostly dropped below advisory criteria. We have allowed the Heat Advisory to expire. Its still unusually hot, so please exercise caution. $$ 05 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||