Alert archive / Iowa / River Flood Warnings in 2026

River Flood Warning 77, NWS Quad Cities, IA

September 21, 2026Des Moines County, Louisa County, Iowa; Henderson County, Mercer County, Illinois

NWS Quad Cities, IA issued this river flood warning at Sep 21, 2026, 11:47 AM CDT for Des Moines County, Louisa County, Iowa; Henderson County, Mercer County, Illinois. It took effect at Sep 22, 2026, 8:30 PM CDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Sep 21, 2026, 11:47 AM CDT (16:47 UTC)
In effect from: Sep 22, 2026, 8:30 PM CDT
Expired: Sep 23, 2026, 11:01 AM CDT
In force: 15 hr
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Flood severity: Minor

Counties Des Moines County, IA, Louisa County, IA, Henderson County, IL, Mercer County, IL

The radar

The Quad Cities radar (KDVN), 74 km from the middle of the area, began a volume at 16:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The river

Written for the forecast point Mississippi River at Keithsburg (KHBI2).

Action stage: 13 ft
Minor stage: 14 ft
Moderate stage: 15.5 ft
Major stage: 17 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

What forecasters said that day

The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this river flood warning went out at Sep 20, 1:22 PM CDT, 22 hours 25 minutes earlier.

Area forecast discussion, Sep 20, 1:22 PM CDT, 22 hours 25 minutes before

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Hazardous weather outlook, Sep 20, 1:59 PM CDT, 21 hours 48 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 20, 7:42 PM CDT	River Flood Warning	DVN	Louisa	6 days
Sep 20, 7:42 PM CDT	River Flood Warning	DVN	Louisa	6 days
Sep 21, 11:47 AM CDT	River Flood Warning	DVN	Des Moines	5 days
Sep 21, 11:47 AM CDT	River Flood Warning	DVN	Des Moines, Lee	5 days

Nearby

River Flood Warnings in Iowa, 2026 River Flood Warnings in Illinois, 2026 Every river flood warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.