Alert archive / Iowa / Special Weather Statements in 2017

Special Weather Statement, NWS Des Moines, IA

October 21, 201720 counties in Iowa

NWS Des Moines, IA issued this special weather statement at Oct 21, 2017, 4:42 PM CDT for 20 counties in Iowa. It was in force for 93 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Oct 21, 2017, 4:42 PM CDT (21:42 UTC)
Expired
Oct 21, 2017, 6:15 PM CDT
In force
93 min
Issued by
NWS Des Moines, IA

Counties Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Calhoun County, IA, Cass County, IA, Dallas County, IA, Greene County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Madison County, IA, Ringgold County, IA, Taylor County, IA, Union County, IA, Webster County, IA, Winnebago County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 58 km from the middle of the area, began a volume at 21:44 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 text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 21, 3:14 PM CDT, 1 hour 28 minutes earlier.

Area forecast discussion, Oct 21, 3:14 PM CDT, 1 hour 28 minutes before
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  <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.
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Hazardous weather outlook, Oct 21, 3:28 PM CDT, 1 hour 14 minutes before
Hazardous Weather Outlook
National Weather Service Des Moines IA
328 PM CDT Sat Oct 21 2017

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-221100-
Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo-
Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun-
Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene-
Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper-
Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union-
Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne-
Appanoose-Davis-
328 PM CDT Sat Oct 21 2017

This Hazardous Weather Outlook is for much central Iowa.

.DAY ONE...This afternoon and tonight

Thunderstorms are expected into the evening, lingering into
eastern Iowa overnight. There is a marginal to slight risk of
severe weather with large hail, damaging wind and a brief tornado
possible. Moderate to locally heavy rains may occur as well,
especially central and east.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Freezing temperatures are possible Thursday night far north and
Friday night over all but far southeast Iowa.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed briefly into the evening hours.

Small

In the hours before

Special weather statement, Oct 21, 4:42 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Des Moines IA
442 PM CDT SAT OCT 21 2017

IAZ005-006-015-016-023>025-034>036-045>047-057>059-070>072-081-082-
092-093-212315-
Humboldt IA-Palo Alto IA-Boone IA-Guthrie IA-Kossuth IA-Winnebago IA-
Carroll IA-Union IA-Madison IA-Hancock IA-Cass IA-Hamilton IA-
Wright IA-Audubon IA-Calhoun IA-Adams IA-Greene IA-Webster IA-
Pocahontas IA-Adair IA-Ringgold IA-Dallas IA-Taylor IA-
442 PM CDT SAT OCT 21 2017

...Strong Storms Moving across Central Iowa...

At 437 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from the Iowa Minnesota border northeast of
Algona...to near Glidden to near Clarinda. The line as a whole was
moving east at 25 mph, while individual storms were moving northeast
along the line at 45 mph.

Up to dime sized hail and winds in excess of 40 mph will be possible
with the stronger storms. Those attending or planning outdoor events
should be prepared for thunderstorms and rapidly changing
conditions, having shelter available on short notice.

Locations impacted include...
Fort Dodge, Waukee, Boone, Webster City, Creston, Perry, Atlantic,
Algona, Winterset, Jefferson, Forest City, Adel, Garner, Clarion,
Greenfield, Rockwell City, Mount Ayr, Corning, Guthrie Center and
Bedford.

LAT...LON 4057 9491 4116 9493 4116 9506 4350 9441
      4350 9350 4303 9350 4057 9418
TIME...MOT...LOC 2137Z 261DEG 23KT 4347 9433 4210 9474 4057 9513

Small

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 21, 6:19 PM CDTSpecial Weather StatementDMXHancock, Wright41 min
Oct 21, 6:58 PM CDTSpecial Weather StatementDMXCerro Gordo, Worth17 min

Nearby

Special Weather Statements in Iowa, 2017Every special weather statement 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.