Severe Thunderstorm Watch issued July 27 at 2:19PM CDT until July 27 at 7:00PM CDT by NWS Chicago IL
Issue date: 2026-07-27T19:19+00:00
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 520 IN EFFECT UNTIL 7 PM CDT /8 PM EDT/ THIS EVENING FOR THE FOLLOWING AREAS IN ILLINOIS THIS WATCH INCLUDES 6 COUNTIES IN EAST CENTRAL ILLINOIS IROQUOIS IN NORTHEAST ILLINOIS COOK DUPAGE KANKAKEE LAKE IL WILL IN INDIANA THIS WATCH INCLUDES 5 COUNTIES IN NORTHWEST INDIANA BENTON JASPER LAKE IN NEWTON PORTER THIS INCLUDES THE CITIES OF BOLINGBROOK, BOURBONNAIS, BUFFALO GROVE, CAROL STREAM, CHESTERTON, CHICAGO, DEMOTTE, DOWNERS GROVE, EVANSTON, FOWLER, GARY, GILMAN, GURNEE, HAMMOND, JOLIET, KANKAKEE, KENTLAND, LEMONT, LOMBARD, MERRILLVILLE, MOROCCO, MUNDELEIN, NAPERVILLE, OAK LAWN, ORLAND PARK, OXFORD, PARK FOREST, PORTAGE, RENSSELAER, ROSELAWN, SCHAUMBURG, VALPARAISO, WATSEKA, WAUKEGAN, WHEATON, AND WILMINGTON.
Beach Hazards Statement issued July 27 at 11:20AM CDT until July 29 at 10:00AM CDT by NWS Chicago IL
Issue date: 2026-07-27T16:20+00:00
* WHAT...High wave action and dangerous currents expected at Lake Michigan beaches. Waves 5 to 9 ft expected. * WHERE...In Illinois, Lake, Northern Cook and Central Cook Counties. In Indiana, Lake and Porter Counties. * WHEN...From late tonight through Wednesday morning. * IMPACTS...Swimming conditions will be life threatening, especially for inexperienced swimmers. For information on swim advisories or bans at Chicago beaches: www. cpdbeaches. com.
Heat Advisory issued July 27 at 9:33AM CDT until July 27 at 9:00PM CDT by NWS Chicago IL
Issue date: 2026-07-27T14:33+00:00
* WHAT...Heat index values in excess of 105 expected. * WHERE...In Illinois, Central Cook, DuPage, Lake IL, Northern Cook, and Southern Cook Counties. In Indiana, Benton, Jasper, Lake IN, and Newton Counties. * WHEN...Until 9 PM CDT /10 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Heat Advisory issued July 27 at 8:03AM CDT until July 27 at 9:00PM CDT by NWS Chicago IL
Issue date: 2026-07-27T13:03+00:00
* 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.
