This event is no longer active — it's kept here as a record. Recovery may still be underway; the guidance below applies.
Part of: Bartholomew County Area Flooding — August 2026 →
Flood Warning issued August 1 at 2:44PM CDT until August 2 at 9:00AM CDT by NWS Chicago IL
This is a severe-significance flood warning event affecting Cook, IL, tracked from official feeds (NOAA / National Weather Service). We update this page as the situation develops.
- Type
- Flood Warning
- Extent
- ≈ 14,860 acres
- Began
- To end
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Affected area map
The shaded area is the affected-area perimeter reported for this event by NOAA / National Weather Service (Cook, IL), colored by hazard type. Pan and zoom to explore the map; when more than one observation exists, use the slider below to step through how the reported area changed.
Interactive affected-area map
Cook, IL · ≈ 23 sq mi reported extent · Enable JavaScript to explore the map.
Shown as reported by our sources — not an official product. For current advisories and the authoritative map, see NOAA / National Weather Service ↗.
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Latest updates
Official updates and news coverage for this event, newest first — National Weather Service products, local storm reports, incident updates and press headlines. Official items are verbatim government text; news headlines link out to the original outlet.
- Forecast discussion NWS LOT
Area Forecast Discussion
Showers and thunderstorms will gradually shift south and east tonight with risk of localized flooding; high waves continue at Lake Michigan beaches.
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000 FXUS63 KLOT 012320 AFDLOT
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 620 PM CDT Sat Aug 1 2026
.KEY MESSAGES...
- Showers and embedded thunderstorms will gradually shift south and east through tonight and may cause localized flooding.
- High waves and dangerous swimming conditions will continue at unprotected Lake Michigan beaches through Monday morning.
&&
.DISCUSSION... Issued at 306 PM CDT Sat Aug 1 2026
A baggy slow moving surface low centered over central Illinois continues to very slowly drift across the region this afternoon with spiraling bands of showers and some embedded thunderstorms wrapping around the system. The key forecast question for much of the day has been where the heaviest bands of rain would set up and begin to pivot this afternoon. The slow moving nature of the system paired with elevated PWATs and warm rain processes has been supportive of rainfall rates in excess of 1-2"/hr at times. Even seemingly "lighter" radar reflectivity values are still likely producing heavy rainfall. Based on the latest radar trends there are two separate general corridors ongoing at this hour. The first extends along the I-80 corridor that…
- Storm report NWS LOT storm report
FLOOD — Homewood, IL
Report of the Dixie Highway viaduct completely flooded and closed. Additionally, the 183rd street viaduct is flooded though barely passable as well as nearby fields are also flooded.
- Storm report NWS LOT storm report
FLOOD — 2 NW Rockdale, IL
Video shared on social media shows a 2 to 3 inches of standing water on roadway.
- Storm report NWS LOT storm report
FLOOD — 2 WSW Crest Hill, IL
Picture shared on social media of 1-2 inches of standing water on roadway.
Show 7 earlier updates
- ABC7 Chicago News
Chicago weather: Heavy rain Saturday with Cook, DuPage, Kendall, Will counties Flash Flood Watch
- NBC 5 Chicago News
Flood watches, warnings in effect amid heavy rains in Chicago area
- NWS Chicago IL Bulletin
- CBS News News
Delay issued for day 3 of Chicago's Lollapalooza due to storms, flood warning
- NWS LOT storm report Storm report
- The Watchers - Watching the world evolve and transform News
- KOMU 8 News
Gov. Kehoe requests federal disaster declaration for July flooding
Updates are captured automatically from official and news sources, and may lag the live source. For the very latest, see NOAA / National Weather Service ↗.