Active Weather Alerts
Severe Thunderstorm Watch
Issued: 4:33 PM Aug. 11, 2026 – National Weather Service
CW . ADJACENT COASTAL WATERS INCLUDED ARE WINTHROP HARBOR TO WILMETTE HARBOR IL WILMETTE HARBOR TO NORTHERLY ISLAND IL NORTHERLY ISLAND TO CALUMET HARBOR IL CALUMET HARBOR IL TO GARY IN GARY TO BURNS HARBOR IN BURNS HARBOR TO MICHIGAN CITY IN LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM OFFSHORE TO MID LAKE LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 5NM OFFSHORE TO MID LAKE
Severe Thunderstorm Watch
Issued: 4:38 PM Aug. 11, 2026 – National Weather Service
THE NATIONAL WEATHER SERVICE HAS CANCELLED SEVERE THUNDERSTORM WATCH 563 FOR THE FOLLOWING AREAS IN ILLINOIS THIS CANCELS 18 COUNTIES IN CENTRAL ILLINOIS LIVINGSTON IN EAST CENTRAL ILLINOIS FORD IROQUOIS IN NORTH CENTRAL ILLINOIS BOONE DE KALB LA SALLE LEE OGLE WINNEBAGO IN NORTHEAST ILLINOIS COOK DUPAGE GRUNDY KANE KANKAKEE KENDALL LAKE IL MCHENRY WILL IN INDIANA THIS CANCELS 1 COUNTY IN NORTHWEST INDIANA LAKE IN THIS INCLUDES THE CITIES OF ALGONQUIN, AURORA, BELVIDERE, BOLINGBROOK, BOURBONNAIS, BUFFALO GROVE, BYRON, CAROL STREAM, CHICAGO, COAL CITY, CRYSTAL LAKE, DEKALB, DIXON, DOWNERS GROVE, DWIGHT, ELGIN, EVANSTON, FAIRBURY, GARY, GIBSON CITY, GILMAN, GURNEE, HAMMOND, JOLIET, KANKAKEE, LA SALLE, LEMONT, LOMBARD, MARSEILLES, MCHENRY, MENDOTA, MERRILLVILLE, MINOOKA, MORRIS, MUNDELEIN, NAPERVILLE, OAK LAWN, OREGON, ORLAND PARK, OSWEGO, OTTAWA, PARK FOREST, PAXTON, PLANO, PONTIAC, ROCHELLE, ROCKFORD, SCHAUMBURG, STREATOR, SYCAMORE, WATSEKA, WAUKEGAN, WHEATON, WILMINGTON, WOODSTOCK, AND YORKVILLE.
Special Marine Warning
Issued: 3:42 PM Aug. 11, 2026 – National Weather Service
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT... For the following areas... Nearshore Waters from Winthrop Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Winthrop Harbor to Michigan City out to Mid Lake... At 1041 AM CDT, severe thunderstorms capable of producing waterspouts were located along a line extending from 9 nm northeast of Elgin to 9 nm southwest of Midway Airport to 7 nm southeast of Joliet, moving east at 50 knots. HAZARD...Waterspouts and wind gusts in excess of 65 knots. SOURCE...Radar indicated. IMPACT...Waterspouts can easily overturn boats and create locally hazardous seas. Boats could suffer significant structural damage in high winds. Small craft could capsize in suddenly higher waves. In addition, rapid large fluctuations in water levels are possible as and after these storms pass. severe thunderstorms will be near... Montrose Harbor, Wilmette Harbor, Monroe Harbor, 31st Street Harbor, Calumet Harbor, Harrison-Dever Crib, Burnham Harbor, Belmont Harbor, Jackson Park Harbor, and Diversy Harbor around 1100 AM CDT. Indiana Harbor around 1105 AM CDT. Burns Harbor and Marina Shores at Dune Harbor around 1120 AM CDT. Michigan City around 1130 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... && WATERSPOUT...POSSIBLE; HAIL...0.00IN; WIND...65KTS
Flood Advisory
Issued: 3:36 PM Aug. 11, 2026 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 130 PM CDT THIS AFTERNOON... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Cook County in northeastern Illinois... DuPage County in northeastern Illinois... Northeastern Kankakee County in northeastern Illinois... Will County in northeastern Illinois... * WHEN...Until 130 PM CDT. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 1035 AM CDT, Doppler radar and automated rain gauges indicated a line of intense thunderstorms with rainfall rates of 2 to 3 inches per hour moving through the area. Localized flooding of roadways and poor drainage areas will occur shortly after the onset of rainfall. - Some locations that will experience flooding include... Chicago, Aurora, Joliet, Naperville, Elgin, Cicero, Arlington Heights, Evanston, Schaumburg, Bolingbrook, Skokie, Des Plaines, Orland Park, Tinley Park, Oak Lawn, Berwyn, Mount Prospect, Wheaton and Hoffman Estates. - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Advisory means minor flooding along waterways and other poor drainage areas is imminent or may already be occurring. Persons in the advisory area should use caution and avoid flood waters. &&
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