ACTIVE — Flash Flood Warning. The National Weather Service in Quad Cities has issued a Flash Flood Warning for parts of eastern Iowa and northwestern Illinois, in effect until 7:30 AM CDT on Sunday, September 20. This is a live snapshot as of 1:52 AM CDT. Conditions change fast — always verify with the National Weather Service for your specific county or ZIP code.
Doppler radar at 1:38 AM CDT showed thunderstorms producing heavy rain moving across the southern and eastern portions of the warned area, and flash flooding is ongoing or expected to begin shortly. Between 1 and 2 inches of rain have already fallen across much of the warned area, with another 1 to 3 inches likely over the next few hours as more heavy-rain-producing storms move back across the area. For restoration teams, this is the classic overnight water event: the rain falls while everyone sleeps, and the interior flooding jobs get discovered at dawn — the exact water-intrusion calls contractors see most.
Quad Cities and Northwest Illinois — Flash Flood Warning
Issuing office: NWS Quad Cities IA IL. Issued: 1:38 AM CDT Sunday, September 20. Expires: 7:30 AM CDT. Severity: Severe. Certainty: Likely. Urgency: Immediate.
Covered areas: Southwestern Clinton County and Scott County in east central Iowa; eastern Muscatine County in east central Iowa; northwestern Bureau County, Henry County, Mercer County, Rock Island County, and southern Whiteside County in northwestern Illinois.
Hazard detail, verbatim from the alert: Flash flooding caused by thunderstorms. Source: radar indicated. At 1:38 AM CDT, Doppler radar indicated thunderstorms producing heavy rain moving across southern and eastern portions of the warned area. Between 1 and 2 inches of rain have fallen across much of the warned area with these storms. More heavy rain producing storms will move back across the area over the next few hours with additional rainfall amounts of 1 to 3 inches likely in the warned area.
Expected impacts, verbatim: Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas.
Locations in the warning path: Davenport, Moline, Rock Island, Bettendorf, Muscatine, East Moline, Kewanee, Aledo, Cambridge, Silvis, Geneseo, Eldridge, Colona, Milan, Le Claire, Coal Valley, and Galva. The warned area also includes Big Bend Fish and Wildlife Area, Johnson-Sauk Trail State Recreation Area, and Prophetstown State Park — if you camped or parked near water in those areas overnight, move to higher ground now.
Highways in the warned area: Interstate 74 in Iowa between mile markers 1 and 5; Interstate 280 between mile markers 1 and 18; Interstate 80 in Iowa between mile markers 279 and 306; Interstate 80 in Illinois between mile markers 1 and 43; Interstate 74 in Illinois between mile markers 1 and 33; Interstate 88 between mile markers 1 and 32, and between mile markers 36 and 43. Never drive through flooded roadways — water over the road is the single most dangerous thing in this warning.
Source: NWS active alert | NWS Quad Cities office page
Stay safe tonight
Turn around, don’t drown when encountering flooded roads — most flood deaths occur in vehicles. Be especially cautious at night, when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads.
If water gets into your home: stay out of standing water where electricity may be present; do not enter the basement until water has receded and power is confirmed off. Photograph everything before you move or clean anything — documentation matters for insurance. Then call a local restoration contractor: water left sitting starts a second wave of damage within a day, and mold can begin within 24 to 48 hours.
If you can do so safely, please report observed flooding to local emergency services or law enforcement and ask that they pass the information to the National Weather Service — spotter reports are what upgrade these warnings from radar-indicated to observed.
What this means for restoration teams
This is a metro-area overnight event covering the Quad Cities corridor (Davenport–Bettendorf–Moline–Rock Island) plus Muscatine, Kewanee, Geneseo, and surrounding communities on both sides of the Mississippi. Damage categories to expect: interior water intrusion through foundations and slab-on-grade entries, saturated drywall and insulation in finished basements, stormwater backing up through floor drains in low-lying areas, and surface water pooling in urban poor-drainage zones. The call pattern will skew residential first light, then commercial — parking structures, below-grade storage, and loading docks along the I-74/I-80/I-280 corridors.
The play: stage equipment tonight and keep an on-call rotation through the morning. Pre-position dehumidifiers, air movers, and extraction units before the 7:30 AM CDT expiry so the first response window isn’t lost to loading the truck. Capture the address, water source, and affected areas on the first call — with 1 to 3 additional inches possible before the warning expires, distinguish active intrusion from post-recession wicking. Field discipline: photo-document before mitigation, moisture-map every affected room (not just the visibly wet ones), and keep the homeowner’s payment responsibility clear in writing before work starts.
FEMA & federal assistance
FEMA Helpline: 1-800-621-3362 (7 a.m.–10 p.m. local, 7 days). You can also apply at DisasterAssistance.gov, through the FEMA app, or find recovery centers at fema.gov/drc. Basic eligibility: citizenship or qualified status, identity verification, proof of occupancy or ownership, and unmet needs not covered by insurance. Apply as soon as it is safe — do not wait for everything to be resolved first.
Looking ahead
The warning runs until 7:30 AM CDT, but the danger doesn’t end at expiry. The alert explicitly notes that additional heavy-rain-producing storms will move back across the area over the next few hours — with another 1 to 3 inches likely on top of the 1 to 2 inches already down, creeks and streams may crest well after the warning lifts, and urban ponding can linger into the morning commute. Watch for the next NWS update around the 7:30 AM CDT mark.
Demand window note: water-intrusion calls typically start within hours of water receding and keep coming for days as people discover damage — the second-day calls (musty odor, buckling flooring, wicking up drywall) often exceed the first-morning wave. Contractors who staff the full 48-hour window after a radar-indicated overnight event capture the jobs others miss.
Sources & how to verify
- NWS alert, read September 20, 2026: api.weather.gov active alert
- NWS Quad Cities IA IL office: weather.gov/dvn
To verify for your own county or ZIP: go to weather.gov and enter your ZIP code, or check the NWS Quad Cities office page linked above.
This post is for informational purposes and is not an official weather warning. Always follow instructions from local authorities and the National Weather Service.
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