Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 56, NWS Sioux Falls, SD

June 12, 1994Woodbury County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jun 12, 1994, 9:46 PM CDT for Woodbury County, Iowa. It was in force for 29 min.

The area

The counties it named.

The facts

Issued: Jun 12, 1994, 9:46 PM CDT (02:46 UTC)
Expired: Jun 12, 1994, 10:15 PM CDT
In force: 29 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

County Woodbury County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.8 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-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: 4262 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1255 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 174 m²/s²
0-3 km storm-relative helicity: 514 m²/s²
Significant tornado parameter: 4.3
Supercell composite: 35.1

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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jun 12, 9:10 PM CDT, 36 minutes before

STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
910 PM CDT SUN JUN 12 1994

STORM DATA FOR SUNDAY JUNE 12 1994

 TIME          COUNTY...LOCATION AND STATE   CHARACTER OF STORM...DAMAGE
.......................................................................

 555 PM CDT   MINNEHAHA...COLTON SD          GOLF BALL SIZE HAIL
 605 PM CDT   NOBLES...8 N WORTHINGTON MN    GOLF BALL SIZE HAIL
 610 PM CDT   ROCK...LUVERNE MN              BASEBALL SIZE HAIL
 610 PM CDT   ROCK...HILLS MN                POSSIBLE TORNADO
 620 PM CDT   NOBLES...RUSHMORE MN           1 INCH SIZE HAIL
 620 PM CDT   NOBLES...READING MN            1 INCH SIZE HAIL
 630 PM CDT   NOBLES...WORTHINGTON MN        TENNIS BALL SIZE HAIL
 636 PM CDT   JACKSON...ROUND LAKE MN        60 MPH WINDS
 725 PM CDT   MINNEHAHA...SIOUX FALLS SD     MARBLE SIZE HAIL

Local storm report, Jun 12, 9:14 PM CDT, 32 minutes before

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Special weather statement, Jun 12, 9:16 PM CDT, 30 minutes before

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<body>
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    <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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    </section>
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Special weather statement, Jun 12, 9:22 PM CDT, 24 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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>
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Local storm report, Jun 12, 9:27 PM CDT, 19 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>

Local storm report, Jun 12, 9:28 PM CDT, 18 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 Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 12, 8:01 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Osceola	29 min
Jun 12, 8:18 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	27 min
Jun 12, 8:23 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	52 min
Jun 12, 8:23 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	37 min
Jun 12, 8:46 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	29 min
Jun 12, 9:01 PM CDT	Severe Thunderstorm Warning	FSD	Plymouth	29 min
Jun 12, 9:05 PM CDT	Severe Thunderstorm Warning	FSD	Woodbury	40 min
Jun 12, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee	46 min
Jun 12, 7:12 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	21 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1994 Every severe thunderstorm warning in 1994

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.