Beach Hazards Statement issued July 27 at 4:44PM CDT until July 29 at 10:00AM CDT by NWS Chicago IL
Issue date: 2026-07-27T21:44+00:00
* WHAT...Thunderstorm activity through late this afternoon will create varying currents, rapid water level fluctuations, and dangerous swimming conditions with waves 3 to 5 feet expected. Northerly winds will develop tonight and create high wave action and dangerous swimming conditions with waves 6 to 9 feet expected. * WHERE...In Illinois, Lake, Northern Cook and Central Cook Counties. In Indiana, Lake and Porter Counties. * WHEN...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.
Flood Warning issued July 27 at 3:09PM CDT until July 28 at 1:00PM CDT by NWS Chicago IL
Issue date: 2026-07-27T20:09+00:00
...The National Weather Service in Chicago IL has issued a Flood Warning for the following rivers in Illinois...Indiana... Little Calumet River at Munster (Hohman Avenue) affecting Cook and Lake IN Counties. For the Little Calumet River...including Munster (Hohman Avenue)... Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Little Calumet River from IN-912 in Hammond downstream to confluence with Thorn Creek in South Holland, including the Munster (Hohman Avenue) gauge. * WHEN...Until early tomorrow afternoon. * IMPACTS...At 12.5 feet, Most areas outside of the levee-protected area are inundated in Hammond and Munster. * ADDITIONAL DETAILS... - At 2:00 PM CDT Monday the stage was 9.3 feet. - The river has begun rising quickly due to earlier heavy rainfall. - Forecast...The river is expected to rise above flood stage by this evening and crest near 12.5 feet late this evening. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
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.
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.
