Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 258, NWS Omaha, NE

October 21, 2017Shelby County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Oct 21, 2017, 2:32 AM CDT for Shelby County, Iowa. It was in force for 17 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: Oct 21, 2017, 2:32 AM CDT (07:32 UTC)
Expired: Oct 21, 2017, 2:49 AM CDT
In force: 17 min
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Shelby County, IA

The radar

The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 07:35 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.

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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 20, 11:38 PM CDT, 2 hours 54 minutes earlier.

Area forecast discussion, Oct 20, 11:38 PM CDT, 2 hours 54 minutes before

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In the hours before

Special weather statement, Oct 21, 2:16 AM CDT, 16 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.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 21, 2:16 AM CDT	Special Weather Statement	OAX	Shelby	29 min
Oct 21, 3:34 AM CDT	Special Weather Statement	OAX	Shelby	41 min
Oct 21, 4:48 PM CDT	Special Weather Statement	OAX	Page	27 min
Oct 21, 6:08 PM CDT	Special Weather Statement	OAX	Montgomery	37 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning in 2017

Sources

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