Criteria
Local offices, particularly those where extreme heat is less frequent or in areas with deserts or mountainous terrain, often have their own criteria.Dangers
Due to the extreme illnesses that can occur, athletes should limit their physical activity when an extreme-heat warning is issued. According to the National High-School Sports-Related Injury-Surveillance System, High-School RIO, an estimated number of 51,943 excessive-heat illnesses occurred in nine of the high-school sports observed between 2005, 2011, and 2020.Example
The following is an example of an extreme heat warning and a heat advisory issued by the National Weather Service office in233 WWUS74 KEWX 131753 NPWEWX URGENT - WEATHER MESSAGE National Weather Service Austin/San Antonio TX 1253 PM CDT Tue May 13 2025 TXZ171>173-183>193-202>208-217>223-228-141000- /O.NEW.KEWX.XH.W.0001.250514T1800Z-250515T0200Z/ /O.EXT.KEWX.HT.Y.0001.250513T1800Z-250514T1800Z/ Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera- Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Kinney-Uvalde-Medina- Bexar-Comal-Guadalupe-Caldwell-Maverick-Zavala-Frio-Atascosa- Wilson-Karnes-Gonzales-Dimmit- Including the cities of Boerne, Bastrop, Georgetown, Uvalde, Leakey, Fredericksburg, Hondo, Pearsall, Lockhart, Del Rio, Floresville, Eagle Pass, Gonzales, Burnet, Brackettville, San Antonio, Rocksprings, Kerrville, Blanco, Crystal City, Austin, Seguin, Bandera, New Braunfels, Carrizo Springs, Llano, San Marcos, Karnes City, and Pleasanton 1253 PM CDT Tue May 13 2025 ...HEAT ADVISORY NOW IN EFFECT UNTIL 1 PM CDT WEDNESDAY... ...EXTREME HEAT WARNING IN EFFECT FROM 1 PM TO 9 PM CDT WEDNESDAY... * WHAT...For the Heat Advisory, air temperatures near 104 degrees, except near 110 along the Rio Grande. For the Extreme Heat Warning, dangerously hot conditions with air temperatures of 105 to 108 degrees, with near 115 degrees along the Rio Grande. * WHERE...A portion of south central Texas. * WHEN...For the Heat Advisory, until 1 PM CDT Wednesday. For the Extreme Heat Warning, from 1 PM to 9 PM CDT Wednesday. * 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. 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. && $$
See also
* Extreme cold warning – the polar opposite of an Excessive heat warningReferences
External links