A Flash Flood Warning remains in effect until 7:30 AM CDT this morning (Sunday, September 20) for the Quad Cities region — covering Scott, Muscatine, and southwestern Clinton counties in Iowa, plus Rock Island, Henry, Mercer, and southern Whiteside counties and northwestern Bureau County in Illinois. The warning was issued by NWS Quad Cities (KDVN) at 5:00 AM CDT.
Why this one matters beyond the roads: this is the exact setup that drives the interior flooding jobs restoration contractors see most — steady rain on already-saturated ground, water pushing into basements, crawlspaces, and ground-floor units across Davenport, Moline, Bettendorf, and Muscatine while most of the area is still asleep. This is a live snapshot as of roughly 3:05 AM Pacific (5:05 AM CDT). Conditions change fast — always verify with the National Weather Service for your specific county or ZIP code.
Quad Cities — Flash Flood Warning
Issuing office: NWS Quad Cities IA IL (KDVN), Des Moines-coverage Quad Cities region.
Issued: 5:00 AM CDT Sunday, September 20, 2026.
Expires: 7:30 AM CDT Sunday, September 20, 2026.
Severity: Severe · Certainty: Likely · Urgency: Immediate.
Alert source: NWS alert (api.weather.gov) · Office page: weather.gov/dvn
The NWS headline reads: “Flash flood warning remains in effect until 7:30 AM CDT this morning for southwestern Clinton, eastern Muscatine, Scott, northwestern Bureau, Henry IL, Mercer, Rock Island and southern Whiteside counties.”
Hazard detail, verbatim from the alert: At 5:00 AM CDT, Doppler radar indicated a large area of light to moderate rain across the warned area. Earlier storms dropped 1 to 3.5 inches of rain across the area, and flash flooding is either ongoing or expected to begin shortly as runoff from the earlier heavy rain combines with the continuing steady rain. Hazard: flash flooding caused by thunderstorms. Source: radar indicated.
Expected impacts: 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 path named in the warning: Davenport, Moline, Rock Island, Bettendorf, Muscatine, East Moline, Kewanee, Aledo, Cambridge, Silvis, Geneseo, Eldridge, Colona, Milan, Le Claire, Coal Valley, and Galva.
State parks included: Big Bend Fish and Wildlife Area, Johnson-Sauk Trail State Recreation Area, and Prophetstown State Park.
Highways affected (from the alert): 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. If your commute touches I-74, I-80, I-88, or I-280 through the Quad Cities corridor this morning, expect flooded low spots and slow to closed lanes.
Stay safe this morning
Turn around, don’t drown when encountering flooded roads — most flood deaths occur in vehicles. Be especially cautious at night and in the pre-dawn hours, when it is harder to recognize the dangers of flooding, and do not drive on flooded roads.
If water is entering your home: stay out of standing water where electricity may be present, avoid the basement until water recedes and power is confirmed off, photograph everything before cleanup begins — documentation matters for insurance — then call a local restoration contractor. Water left sitting starts a second wave of damage within a day. Please report observed flooding to local emergency services or law enforcement and request they pass the information to the National Weather Service when you can do so safely.
What this means for restoration teams
This is the signature scenario for early-morning water-intrusion calls: 1 to 3.5 inches on saturated ground, continued steady rain, and urban low spots across a metro area that woke up to water. Expect the call mix to skew toward interior water intrusion in basements and ground-floor units, saturated drywall and insulation where runoff ponded against foundations, and sewage backup in low-lying neighborhoods and older combined-sewer blocks in Davenport and Moline. Mold risk starts the clock within 24–48 hours wherever water sits.
The play: stage extraction and drying equipment now, pre-position dehumidifiers and air movers for a mid-morning deployment wave, and keep an on-call rotation through at least the afternoon — water-intrusion discovery calls typically lag the event by several hours as people wake up and check basements. On the first call, capture the address, the water source (seepage vs. backup vs. surface water), and every affected room before the crew rolls.
Field discipline: photo-document before any mitigation begins, moisture-map every affected room (not just the visibly wet ones), and keep the homeowner’s payment responsibility clear in writing before work starts — flood-source gray water carries a different conversation than a clean supply-line break, and it needs to be set up front.
FEMA & federal assistance
If your home or business takes damage: 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 a recovery center 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’s safe — and keep your insurance documentation and the contractor’s photo log together from day one.
Looking ahead
The warning expires at 7:30 AM CDT, but the risk doesn’t end on the clock. Watch for additional rounds of rain redeveloping over the same saturated counties, and remember that small creeks and streams can crest after the rain stops — Rock River and Mississippi tributary lowlands stay vulnerable into the afternoon. The next NWS update will land as conditions evolve; check weather.gov/dvn or weather.gov for your county.
Demand window note: water-intrusion calls typically start within hours of water receding and keep coming for days as people discover damage in basements, crawlspaces, and storage areas they didn’t check on day one.
Sources & how to verify
- NWS Flash Flood Warning — Quad Cities (api.weather.gov)
- NWS Quad Cities office page (weather.gov/dvn)
To verify for your own county or ZIP: go to weather.gov, enter your location, and check the active alerts banner — or follow the NWS Quad Cities office page for the latest updates.
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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