Extreme Heat Warning
Status
Event Continued Active alertStart Time
Tue 06/30/2026 10:06 AM EDTEnd Time
Fri 07/03/2026 01:00 AM EDTSignificance
WarningImpacts
High impact
Full Alert Message
URGENT - WEATHER MESSAGE National Weather Service Chicago IL 906 AM CDT Tue Jun 30 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT /1 AM EDT/ THURSDAY NIGHT... * WHAT...Dangerously hot conditions with heat index values around 105 expected each afternoon. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...Until midnight CDT /1 AM EDT/ Thursday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Dangerous heat is now expected to persist through Thursday. Thunderstorms may begin to bring some relief from the heat for portions of northern Illinois by Thursday afternoon or evening. 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 and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
Technical Header
ILZ003>006-008-010>013-019>021-023-032-033-039-106>108-INZ001-002- 010-011-019-010015- /O.CON.KLOT.XH.W.0001.000000T0000Z-260703T0500Z/ Winnebago-Boone-McHenry-Lake IL-Ogle-Lee-De Kalb-Kane-DuPage-La Salle-Kendall-Grundy-Kankakee-Livingston-Iroquois-Ford-Northern Will-Southern Will-Eastern Will-Lake IN-Porter-Newton-Jasper- Benton- Including the cities of Downers Grove, Crystal Lake, Valparaiso, Buffalo Grove, Gilman, Dixon, Sycamore, Gurnee, Carol Stream, Paxton, Peotone, Kankakee, Portage, Gary, McHenry, Roselawn, Mokena, Waukegan, Chesterton, Wheaton, Oxford, Plano, Pontiac, Byron, DeKalb, Crete, Elgin, Ottawa, Watseka, Algonquin, La Salle, Lombard, Coal City, Yorkville, Dwight, Morris, Minooka, Wilmington, Hammond, Aurora, Kentland, DeMotte, Streator, Joliet, Rochelle, Morocco, Fowler, Belvidere, Oswego, Bradley, Fairbury, Bolingbrook, Bourbonnais, Plainfield, Channahon, Manhattan, Beecher, Marseilles, Naperville, Oregon, Merrillville, Gibson City, Rensselaer, Mendota, Woodstock, Rockford, and Mundelein 906 AM CDT Tue Jun 30 2026 /1006 AM EDT Tue Jun 30 2026/
