Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 20, NWS Des Moines, IA

April 27, 2024Clarke County, Ringgold County, Union County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 27, 2024, 2:40 PM CDT for Clarke County, Ringgold County, Union County, Iowa. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 27, 2024, 2:40 PM CDT (19:40 UTC)
Expired: Apr 27, 2024, 3:30 PM CDT
In force: 50 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Clarke County, IA, Ringgold County, IA, Union County, IA

The radar

The Des Moines radar (KDMX), 94 km from the middle of the area, began a volume at 19:42 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 27, 1:40 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 7.7 hours before the alert went out and 196 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -89 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

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

NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 27, 2:04 PM CDT, 36 minutes earlier.

Area forecast discussion, Apr 27, 2:04 PM CDT, 36 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>

Hazardous weather outlook, Apr 27, 3:34 AM CDT, 11 hours 6 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
Apr 26, 7:13 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	47 min
Apr 26, 7:13 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Cass	47 min
Apr 26, 7:16 PM CDT	Tornado Warning	DMX	Adair, Madison, Union	44 min
Apr 26, 7:21 PM CDT	Tornado Warning	DMX	Ringgold	39 min
Apr 26, 7:25 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Calhoun, Carroll, Crawford, Greene, Pocahontas and 2 more	50 min
Apr 26, 7:29 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Ringgold, Taylor, Union	46 min
Apr 26, 7:43 PM CDT	Tornado Warning Tornado observed	DMX	Adair, Clarke, Madison, Union	47 min
Apr 26, 7:56 PM CDT	Tornado Warning	DMX	Madison, Warren	49 min
Apr 26, 7:58 PM CDT	Tornado Warning	DMX	Clarke, Decatur, Ringgold, Union	47 min
Apr 26, 8:10 PM CDT	Tornado Warning	DMX	Clarke, Madison, Union	35 min
Apr 26, 8:20 PM CDT	Tornado Warning	DMX	Dallas, Madison, Polk, Warren	25 min
Apr 26, 8:38 PM CDT	Tornado Warning	DMX	Clarke, Ringgold, Union	29 min
Apr 26, 8:40 PM CDT	Tornado Warning	DMX	Clarke, Lucas, Marion, Warren	50 min
Apr 26, 8:49 PM CDT	Tornado Warning	DMX	Jasper, Marion, Polk, Warren	41 min
Apr 26, 9:09 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Webster	17 min
Apr 26, 9:14 PM CDT	Tornado Warning	DMX	Jasper, Marion, Warren	46 min
Apr 26, 9:47 PM CDT	Tornado Warning	DMX	Jasper	28 min
Apr 26, 10:00 PM CDT	Special Weather Statement	DMX	Dallas	45 min
Apr 26, 11:02 PM CDT	Tornado Warning	DMX	Polk	21 min
Apr 27, 1:17 PM CDT	Flood Watch	DMX	Adams, Appanoose, Cass, Clarke, Davis, Decatur and 7 more	12 hr
Apr 27, 3:44 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Mahaska, Marion, Poweshiek	46 min
Apr 27, 4:13 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Madison, Warren	20 min
Apr 27, 4:24 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Poweshiek	51 min
Apr 27, 5:53 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Lucas, Mahaska, Marion, Monroe and 2 more	52 min
Apr 27, 6:26 PM CDT	Severe Thunderstorm Warning	DMX	Davis, Mahaska, Poweshiek, Wapello	49 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2024 Every severe thunderstorm warning in 2024

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.