Alert archive / Iowa / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 30, NWS Omaha, NE

July 1, 1994Harrison County, Pottawattamie County, Shelby County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 1, 1994, 5:28 PM CDT for Harrison County, Pottawattamie County, Shelby County, Iowa. It was in force for 48 min.

The area

The counties it named.

The facts

Issued: Jul 1, 1994, 5:28 PM CDT (22:28 UTC)
Expired: Jul 1, 1994, 6:16 PM CDT
In force: 48 min
Issued by: NWS Omaha, NE
Area: Whole counties

Counties Harrison County, IA, Pottawattamie County, IA, Shelby County, IA

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.5 hours before the alert went out and 73 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: 1691 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 1310 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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

Special weather statement, Jul 1, 4:41 PM CDT, 47 minutes before

NEZ002>005-008-009-023>031-035>037-057>063-071>077-084>087-020045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
440 PM CDT (340 PM MDT) FRI JUL 1 1994

TORNADO WATCH NUMBER 532 WHICH WAS ISSUED ABOUT 145 PM CDT FOR A LARGE
PART OF CENTRAL AND WESTERN NEBRASKA IS NOT LONGER IN EFFECT IN THE
CENTRAL PART OF THE NEBRASKA PANHANDLE.

TORNADOES ARE NOW CONSIDER LESS LIKELY IN DAWES...BOX BUTTE MORRILL
AND CHEYENNE COUNTIES OF THE PANHANDLE.

THE TORNADO WATCH REMAINS IN EFFECT IN THE EASTERN MOST COUNTIES OF
THE NEBRASKA PANHANDLE AND THROUGHOUT MUCH OF WESTERN AND CENTRAL
NEBRASKA UNTIL 9 PM CDT/ 8 PM MDT THIS FRIDAY EVENING.

IN ADDITION SEVERE THUNDERSTORM WATCH IS IN EFFECT IN EAST CENTRAL
AND SOUTHEAST NEBRASKA UNTIL 9 PM CDT.

AT 440 PM VERY DANGEROUS THUNDERSTORMS WERE IN PROGRESS IN NORTH
CENTRAL AND EAST CENTRAL NEBRASKA.

POWERS

Special weather statement, Jul 1, 4:41 PM CDT, 47 minutes before

NEZ002>005-008-009-023>031-035>037-057>063-071>077-084>087-020045-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
440 PM CDT (340 PM MDT) FRI JUL 1 1994

TORNADO WATCH NUMBER 532 WHICH WAS ISSUED ABOUT 145 PM CDT FOR A LARGE
PART OF CENTRAL AND WESTERN NEBRASKA IS NOT LONGER IN EFFECT IN THE
CENTRAL PART OF THE NEBRASKA PANHANDLE.

TORNADOES ARE NOW CONSIDER LESS LIKELY IN DAWES...BOX BUTTE MORRILL
AND CHEYENNE COUNTIES OF THE PANHANDLE.

THE TORNADO WATCH REMAINS IN EFFECT IN THE EASTERN MOST COUNTIES OF
THE NEBRASKA PANHANDLE AND THROUGHOUT MUCH OF WESTERN AND CENTRAL
NEBRASKA UNTIL 9 PM CDT/ 8 PM MDT THIS FRIDAY EVENING.

IN ADDITION SEVERE THUNDERSTORM WATCH IS IN EFFECT IN EAST CENTRAL
AND SOUTHEAST NEBRASKA UNTIL 9 PM CDT.

AT 440 PM VERY DANGEROUS THUNDERSTORMS WERE IN PROGRESS IN NORTH
CENTRAL AND EAST CENTRAL NEBRASKA.

POWERS

Special weather statement, Jul 1, 5:03 PM CDT, 25 minutes before

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Special weather statement, Jul 1, 5:05 PM CDT, 23 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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Special weather statement, Jul 1, 5:08 PM CDT, 20 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.
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Special weather statement, Jul 1, 5:09 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>
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</body>
</html>

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 4:55 PM CDT	Tornado Warning	OAX	Seward	50 min
Jul 1, 6:00 PM CDT	Severe Thunderstorm Warning	OAX	Seward	24 min
Jul 1, 6:34 PM CDT	Severe Thunderstorm Warning	OAX	Saline	41 min
Jul 1, 6:53 PM CDT	Severe Thunderstorm Warning	OAX	Saline	25 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.