41°30'N / 87°38'W / Altitude 198 m / 00:19 2026/08/02, America/Chicago (UTC-5)
From: 2026/08/01, 23:37
To: 2026/08/02, 11:00
* WHAT...Flooding caused by excessive rainfall will continue. * WHERE...Southeastern Cook County in northeastern Illinois... Central Will County in northeastern Illinois... Northwestern Lake IN County in northwestern Indiana... * WHEN...Until 1100 AM CDT Sunday. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Slow moving or standing water may continue. High water may only slowly recede from flooded areas. * ADDITIONAL DETAILS... - At 1133 PM CDT, gauges on area creeks, streams, and rivers indicated ongoing flooding from earlier excessive rainfall in the warned area. - Some locations that will experience flooding include... Hammond, Gary, Tinley Park, Calumet City, Chicago Heights, East Chicago, Lansing, Oak Forest, Harvey, Highland, Munster, Dolton, Park Forest, Homewood, Matteson, Mokena, Frankfort, Steger, and South Holland. - http://www.weather.gov/safety/flood
Cook, IL; Will, IL; Lake, IN
A Flood Warning means flooding is imminent or may already be
occurring. Persons along rivers, creeks, and other waterways should
take immediate precautions to protect life and property.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
NWS Chicago IL
2026/08/01, 23:37
From: 2026/08/01, 22:07
To: 2026/08/02, 06:15
* WHAT...High wave action and dangerous currents expected at Lake Michigan beaches. Waves 5 to 8 ft expected. * WHERE...Lake IL, Northern Cook and Central Cook Counties. * WHEN...Through Monday 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.
CookRemain out of the water to avoid dangerous swimming conditions
and do not venture out onto piers, jetties, breakwalls, or other
shoreline structures.NWS Chicago IL2026/08/01, 22:07From: 2026/08/01, 19:00
To: 2026/08/02, 01:00
* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...Southeastern Cook County in northeastern Illinois... Southeastern DuPage County in northeastern Illinois... Will County in northeastern Illinois... Northern Lake IN County in northwestern Indiana... * WHEN...Until 100 AM CDT. * IMPACTS...Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Underpasses may be flooded. Roads and streets may be flooded. * ADDITIONAL DETAILS... - At 656 PM CDT, Doppler radar and automated rain gauges indicated light to moderate rain occurring in areas where heavy rainfall occurred earlier. Minor flooding is ongoing or expected to begin shortly in the advisory area. - Some locations that will experience flooding include... Chicago, Joliet, Hammond, Gary, Bolingbrook, Orland Park, Tinley Park, Oak Lawn, Romeoville, Plainfield, Calumet City, Merrillville, Woodridge, Chicago Heights, Roseland, Chicago Lawn, Englewood, and South Shore. - http://www.weather.gov/safety/flood
Cook, IL; DuPage, IL; Will, IL; Lake, INA 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.NWS Chicago IL2026/08/01, 19:00