Alert archive / Illinois / Areal Flood Warnings in 2011

Areal Flood Warning 18, NWS Lincoln, IL

June 18, 2011Morgan County, Sangamon County, Illinois

NWS Lincoln, IL issued this areal flood warning at Jun 18, 2011, 10:33 PM CDT for Morgan County, Sangamon County, Illinois. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 18, 2011, 10:33 PM CDT (03:33 UTC)
Expired
Jun 19, 2011, 4:30 AM CDT
In force
6 hr
Issued by
NWS Lincoln, IL
Area
Storm-based polygon
Flood severity
None

Counties Morgan County, IL, Sangamon County, IL

The radar

The Lincoln radar (KILX), 68 km from the middle of the area, began a volume at 03:31 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 nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.6 hours before the alert went out and 122 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2011-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 115 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2011-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -18 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
115 J/kg
Mixed-layer CIN
-294 J/kg
Mixed-layer LCL
1196 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
-18 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Lincoln, IL wrote its last area forecast discussion before this areal flood warning went out at Jun 18, 8:55 PM CDT, 1 hour 38 minutes earlier.

Area forecast discussion, Jun 18, 8:55 PM CDT, 1 hour 38 minutes before
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Hazardous weather outlook, Jun 18, 3:43 PM CDT, 6 hours 50 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 7:25 PM CDTFlash Flood WarningILXSangamon12 hr
Jun 19, 1:09 AM CDTSpecial Weather StatementILXMorgan, Scott66 min
Jun 19, 4:34 AM CDTFlash Flood WarningILXEffingham, Shelby9 hr
Jun 19, 4:35 AM CDTAreal Flood WarningILXMorgan, Sangamon14 hr
Jun 19, 5:24 AM CDTSevere Thunderstorm WarningILXCrawford, Lawrence36 min
Jun 19, 7:16 AM CDTFlash Flood WarningILXSangamon7 hr
Jun 19, 9:16 AM CDTFlash Flood WarningILXScott12 hr
Jun 19, 9:53 AM CDTAreal Flood AdvisoryILXCass, Morgan6 hr
Jun 19, 10:29 AM CDTRiver Flood WarningILXLawrence69 hr
Jun 19, 2:29 PM CDTFlash Flood WatchILXSangamon15 hr
Jun 19, 6:34 PM CDTAreal Flood WarningILXMorgan12 hr

Nearby

Areal Flood Warnings in Illinois, 2011Every areal flood warning in 2011

Sources

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