This event is no longer active — it's kept here as a record. Recovery may still be underway; the guidance below applies.
Part of: Shelby County Area Flooding — August 2026 →
Flood Warning issued August 11 at 8:48PM CDT until August 13 at 4:00PM 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
Strong to severe thunderstorms with damaging winds and heavy rain expected later this morning, with stormy conditions persisting through the weekend and potential flooding.
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000 FXUS63 KLOT 121219 AFDLOT
Area Forecast Discussion National Weather Service Chicago/Romeoville, IL 719 AM CDT Wed Aug 12 2026
.KEY MESSAGES...
- Isolated strong storms possible early this morning.
- Another fast-moving line of strong/severe thunderstorms is expected later this morning with a damaging wind and heavy rainfall threat.
- Our active, stormy weather pattern is expected to persist into the weekend with periodic chances of severe weather and heavy rainfall which could lead to flooding.
- A period of dry weather may finally arrive early next week.
&&
.DISCUSSION... Issued at 329 AM CDT Wed Aug 12 2026
Forecast remains complex within our persistent pattern of active weather. Main concern in the near term is the potential for another fast-moving line of wind-producing storms across at least a portion of the area later this morning/midday.
A nearly stationary frontal boundary remains in place across the Midwest early this morning, stretching roughly from near Omaha to north of Des Moines to Milwaukee. Complicating the surface pattern however, is the remnant outflow boundary from Tuesday's derecho, which intersects the front near Waterloo, IA and extends southeast…
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- Bulletin NWS Chicago IL
Flood Warning issued
Cook, IL
- Storm report NWS IWX storm report
FLOOD — 3 W Niles, MI
Report from mPING: River/Creek overflowing; Cropland/Yard/Basement Flooding.
Show 6 earlier updates
- WTTW News
Nearly 300K Experienced Power Outages After Storms Push Through Chicago Region
- NWS IWX storm report Storm report
- ABC7 Chicago News
- Samaritan's Purse News
- NBC 5 Chicago News
Flood advisories issued, and here are latest rainfall totals in Chicago area
- CBS News News
Flood Watch, severe thunderstorm watch for Chicago area overnight for second round of severe storms
Updates are captured automatically from official and news sources, and may lag the live source. For the very latest, see NOAA / National Weather Service ↗.