Alert archive / Iowa / Wind Chill Advisories in 2013

Wind Chill Advisory 5, NWS Des Moines, IA

February 18, 201312 counties in Iowa

NWS Des Moines, IA issued this wind chill advisory at Feb 18, 2013, 3:21 PM CST for 12 counties in Iowa. It took effect at Feb 19, 2013, 12:00 AM CST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Feb 18, 2013, 3:21 PM CST (21:21 UTC)
In effect from: Feb 19, 2013, 12:00 AM CST
Expired: Feb 19, 2013, 12:00 PM CST
In force: 12 hr
Issued by: NWS Des Moines, IA

Counties Butler County, IA, Cerro Gordo County, IA, Emmet County, IA, Franklin County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Palo Alto County, IA, Pocahontas County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 144 km from the middle of the area, began a volume at 21:23 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 204 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: 882 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: -89 m²/s²
0-3 km storm-relative helicity: -14 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 wind chill advisory 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 wind chill advisory went out at Feb 18, 11:37 AM CST, 3 hours 44 minutes earlier.

Area forecast discussion, Feb 18, 11:37 AM CST, 3 hours 44 minutes before

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Hazardous weather outlook, Feb 18, 4:22 AM CST, 10 hours 59 minutes before

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In the hours before

Special weather statement, Feb 18, 1:25 PM CST, 1 hour 56 minutes before

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<head>
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  <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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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 3:45 AM CST	Wind Advisory	DMX	Calhoun, Carroll, Cerro Gordo, Crawford, Emmet, Hancock and 7 more	17 hr

Nearby

Wind Chill Advisories in Iowa, 2013 Every wind chill advisory in 2013

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.