Alert archive / Iowa / Flash Flood Warnings in 1993

Flash Flood Warning 109, NWS Des Moines, IA

August 18, 1993Iowa County, Iowa

NWS Des Moines, IA issued this flash flood warning at Aug 18, 1993, 5:30 AM CDT for Iowa County, Iowa. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Aug 18, 1993, 5:30 AM CDT (10:30 UTC)
Expired: Aug 18, 1993, 8:30 AM CDT
In force: 3 hr
Issued by: NWS Des Moines, IA
Area: Whole counties

County Iowa County, IA

The nearest sounding before it

Minneapolis, MN (KSTC), launched 00:00Z, 10.5 hours before the alert went out and 373 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1153 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

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

In the hours before

Special weather statement, Aug 18, 3:43 AM CDT, 1 hour 47 minutes before

<!doctype html>
<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>

Special weather statement, Aug 18, 4:45 AM CDT, 45 minutes before

<!doctype html>
<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 Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 12:53 PM CDT	Severe Thunderstorm Warning	DMX	Johnson, Linn	22 min
Aug 18, 1:21 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	54 min
Aug 18, 2:07 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Carroll	53 min
Aug 18, 2:14 PM CDT	Severe Thunderstorm Warning	DMX	Sac	46 min
Aug 18, 2:29 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Greene	46 min
Aug 18, 2:54 PM CDT	Severe Thunderstorm Warning	DMX	Greene, Guthrie	51 min
Aug 18, 3:11 PM CDT	Severe Thunderstorm Warning	DMX	Adair	34 min
Aug 18, 3:13 PM CDT	Severe Thunderstorm Warning	DMX	Webster	47 min
Aug 18, 3:29 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Madison	46 min
Aug 18, 3:38 PM CDT	Flash Flood Warning	DMX	Greene	3 hr
Aug 18, 3:38 PM CDT	Flash Flood Warning	DMX	Greene	3 hr
Aug 18, 3:56 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Story	64 min
Aug 18, 4:25 PM CDT	Flash Flood Warning	DMX	Polk	4 hr
Aug 18, 4:25 PM CDT	Severe Thunderstorm Warning	DMX	Warren	50 min
Aug 18, 5:07 PM CDT	Severe Thunderstorm Warning	DMX	Keokuk, Mahaska	38 min
Aug 18, 5:17 PM CDT	Severe Thunderstorm Warning	DMX	Marion	43 min

Nearby

Flash Flood Warnings in Iowa, 1993 Every flash flood warning in 1993

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.