Active Weather Alerts
Severe Thunderstorm Watch
Issued: 3:33 PM Aug. 12, 2026 – National Weather Service
IL . ILLINOIS COUNTIES INCLUDED ARE BUREAU CHAMPAIGN COOK DE KALB DE WITT DUPAGE FORD FULTON GRUNDY HANCOCK HENDERSON HENRY IROQUOIS KANE KANKAKEE KENDALL KNOX LA SALLE LEE LIVINGSTON LOGAN MCDONOUGH MCLEAN MARSHALL MASON MERCER PEORIA PIATT PUTNAM ROCK ISLAND STARK TAZEWELL VERMILION WARREN WHITESIDE WILL WOODFORD
Severe Thunderstorm Watch
Issued: 3:33 PM Aug. 12, 2026 – National Weather Service
CW . ADJACENT COASTAL WATERS INCLUDED ARE 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
Special Marine Warning
Issued: 3:06 PM Aug. 12, 2026 – National Weather Service
...A SPECIAL MARINE WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT... For the following areas... Nearshore Waters from Wilmette Harbor to Calumet Harbor... Nearshore Waters from Calumet Harbor to Michigan City... Open Waters from Wilmette Harbor to Michigan City out to Mid Lake... At 1006 AM CDT, strong thunderstorms were located along a line extending from 6 nm southwest of Ohare Airport to 14 nm southwest of Hammond Marina, moving east at 40 knots. HAZARD...Wind gusts to 40 knots. SOURCE...Radar indicated. IMPACT...Small craft could be damaged in briefly higher winds and suddenly higher waves. strong thunderstorms will be near... Monroe Harbor, 31st Street Harbor, Calumet Harbor, Burnham Harbor, Belmont Harbor, Jackson Park Harbor, Diversy Harbor, Hammond Marina, 59th Street Marina, and DuSable Harbor around 1020 AM CDT. Montrose Harbor, Indiana Harbor, and Harrison-Dever Crib around 1025 AM CDT. Burns Harbor and Marina Shores at Dune Harbor around 1040 AM CDT. PRECAUTIONARY/PREPAREDNESS ACTIONS... && HAIL...0.00IN; WIND...40KTS
Flood Advisory
Issued: 2:30 PM Aug. 12, 2026 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 130 PM CDT THIS AFTERNOON... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Southeastern Cook County in northeastern Illinois... Kankakee County in northeastern Illinois... Will County in northeastern Illinois... * WHEN...Until 130 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. Underpasses may be flooded. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 928 AM CDT, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms with rainfall rates of 1 to 2 inches per hour moving into an area with high soil moisture due to recent rainfall. Minor flooding may begin shortly after the onset of rainfall. - Some locations that will experience flooding include... Chicago, Joliet, Naperville, Bolingbrook, Orland Park, Tinley Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Chicago Heights, Roseland, Lansing, Oak Forest, Kankakee, Harvey and Lockport. - 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. &&
River Flood Warning
Issued: 1:48 AM Aug. 12, 2026 – National Weather Service
...FLOOD WARNING IN EFFECT FROM THIS EVENING TO THURSDAY AFTERNOON... * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Thorn Creek from Near Glenwood downstream to confluence with Little Calumet River, including the Thornton gauge. * WHEN...From this evening to Thursday afternoon. * IMPACTS...At 11.0 feet, 187th Street threatened in Glenwood. * ADDITIONAL DETAILS... - At 8:30 PM CDT Tuesday the stage was 9.6 feet. - Forecast...The river is expected to rise to a crest of 10.7 feet just after midnight tonight. It will then fall below flood stage late Thursday morning. - Flood stage is 9.0 feet. - http://www.weather.gov/safety/flood &&
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