Active Weather Alerts
Flood Advisory
Issued: 5:17 PM Aug. 12, 2026 – National Weather Service
...FLOOD ADVISORY IN EFFECT UNTIL 215 PM CDT THIS AFTERNOON... ...REPLACES FLASH FLOOD WARNING... * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Northeastern La Salle County in north central Illinois... Southwestern Cook County in northeastern Illinois... Grundy County in northeastern Illinois... Northern Kankakee County in northeastern Illinois... Southern Kendall County in northeastern Illinois... Will County in northeastern Illinois... * WHEN...Until 215 PM CDT. * IMPACTS...Flooding may occur in poor drainage and urban areas. High water likely may recede slowly from flooded areas. * ADDITIONAL DETAILS... - At 1216 PM CDT, Doppler radar indicated that rainfall was ending across the area. Some creeks may continue to rise or remain elevated for a few hours due to earlier heavy rainfall. - Some locations that will experience flooding include... Joliet, Kankakee, New Lenox, Park Forest, Mokena, Bourbonnais, Frankfort, Bradley, Morris, Channahon, Minooka, Steger, Manteno, Braidwood, Wilmington, Coal City, Marseilles and Peotone. - 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. &&
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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