521 WWUS73 KLOT 271048 NPWLOT URGENT - WEATHER MESSAGE National Weather Service Chicago IL 548 AM CDT Mon Jul 27 2026 ILZ003-008-010-011-019-021-032-272100- /O.CON.KLOT.XH.W.0002.000000T0000Z-260728T0200Z/ /O.CON.KLOT.FG.Y.0011.000000T0000Z-260727T1300Z/ Winnebago-Ogle-Lee-De Kalb-La Salle-Grundy-Livingston- Including the cities of Fairbury, Dixon, Sycamore, Ottawa, Coal City, Morris, Byron, Pontiac, Streator, Dwight, Oregon, Mendota, Marseilles, La Salle, DeKalb, Rochelle, Minooka, and Rockford 548 AM CDT Mon Jul 27 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...For the Extreme Heat Warning, dangerously hot conditions with peak heat index values 110 to locally over 115 degrees expected. For the Dense Fog Advisory, visibility less than one quarter mile in dense fog. * WHERE...Livingston, De Kalb, La Salle, Lee, Ogle, Winnebago, and Grundy Counties. * WHEN...For the Extreme Heat Warning, until 9 PM CDT this evening. For the Dense Fog Advisory, until 8 AM CDT this morning. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Low visibility could make driving conditions hazardous. 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. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ ILZ039-272100- /O.CON.KLOT.XH.W.0002.000000T0000Z-260728T0200Z/ Ford- Including the cities of Paxton and Gibson City 548 AM CDT Mon Jul 27 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with peak heat index values 110 to locally over 115 degrees expected. * WHERE...Ford County. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ INZ001-010-011-019-272100- /O.EXA.KLOT.FG.Y.0011.000000T0000Z-260727T1300Z/ /O.CON.KLOT.HT.Y.0004.000000T0000Z-260728T0200Z/ Lake IN-Newton-Jasper-Benton- Including the cities of Kentland, Roselawn, Fowler, Gary, Merrillville, Oxford, Morocco, Rensselaer, DeMotte, and Hammond 548 AM CDT Mon Jul 27 2026 /648 AM EDT Mon Jul 27 2026/ ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM CDT /9 AM EDT/ THIS MORNING... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT /10 PM EDT/ THIS EVENING... * WHAT...For the Heat Advisory, peak heat index values up to 100 to 110 degrees expected. For the Dense Fog Advisory, visibility less than one quarter mile in dense fog. * WHERE...Benton, Jasper, Lake IN, and Newton Counties. * WHEN...For the Dense Fog Advisory, until 8 AM CDT /9 AM EDT/ this morning. For the Heat Advisory, until 9 PM CDT /10 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Low visibility could make driving conditions hazardous. 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. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ INZ002-271300- /O.EXA.KLOT.FG.Y.0011.000000T0000Z-260727T1300Z/ Porter- Including the cities of Portage, Valparaiso, and Chesterton 548 AM CDT Mon Jul 27 2026 ...DENSE FOG ADVISORY IN EFFECT UNTIL 8 AM CDT THIS MORNING... * WHAT...Visibility less than one quarter mile in dense fog. * WHERE...Porter County. * WHEN...Until 8 AM CDT this morning. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...The lowest visibility will likely be encountered near and south of the Indiana Toll Road. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ ILZ004-005-012-020-272100- /O.CON.KLOT.FG.Y.0011.000000T0000Z-260727T1300Z/ /O.CON.KLOT.HT.Y.0004.000000T0000Z-260728T0200Z/ Boone-McHenry-Kane-Kendall- Including the cities of Belvidere, Woodstock, Aurora, Crystal Lake, Elgin, Plano, Oswego, Yorkville, McHenry, and Algonquin 548 AM CDT Mon Jul 27 2026 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 8 AM CDT THIS MORNING... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...For the Heat Advisory, peak heat index values up to 100 to 110 degrees expected. For the Dense Fog Advisory, visibility less than one quarter mile in dense fog. * WHERE...Boone, Kane, Kendall, and McHenry Counties. * WHEN...For the Dense Fog Advisory, until 8 AM CDT this morning. For the Heat Advisory, until 9 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Low visibility could make driving conditions hazardous. 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. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ ILZ006-013-023-033-103>108-272100- /O.CON.KLOT.HT.Y.0004.000000T0000Z-260728T0200Z/ Lake IL-DuPage-Kankakee-Iroquois-Northern Cook-Central Cook- Southern Cook-Northern Will-Southern Will-Eastern Will- Including the cities of Chicago, Cicero, Oak Park, Bolingbrook, Oak Forest, Schaumburg, Joliet, Northbrook, Lemont, Calumet City, Mokena, Carol Stream, Mundelein, Orland Park, Waukegan, La Grange, Park Forest, Channahon, Watseka, Gilman, Naperville, Wheaton, Bradley, Bourbonnais, Plainfield, Evanston, Crete, Downers Grove, Peotone, Buffalo Grove, Gurnee, Manhattan, Wilmington, Kankakee, Oak Lawn, Beecher, Lombard, Palatine, and Des Plaines 548 AM CDT Mon Jul 27 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...Peak heat index values up to 100 to 110 degrees expected. * WHERE...Iroquois, Central Cook, DuPage, Eastern Will, Kankakee, Lake IL, Northern Cook, Northern Will, Southern Cook, and Southern Will Counties. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ RC