Alert archive / Iowa / Wind Chill Advisories in 2020

Wind Chill Advisory 1, NWS Des Moines, IA

January 15, 202013 counties in Iowa

NWS Des Moines, IA issued this wind chill advisory at Jan 15, 2020, 3:10 PM CST for 13 counties in Iowa. It took effect at Jan 15, 2020, 9:00 PM CST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued: Jan 15, 2020, 3:10 PM CST (21:10 UTC)
In effect from: Jan 15, 2020, 9:00 PM CST
Expired: Jan 16, 2020, 9:00 AM CST
In force: 12 hr
Issued by: NWS Des Moines, IA

Counties Bremer County, IA, 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), 142 km from the middle of the area, began a volume at 21:08 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, 9.2 hours before the alert went out and 205 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: 1080 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 410 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 Jan 15, 2:47 PM CST, 23 minutes earlier.

Area forecast discussion, Jan 15, 2:47 PM CST, 23 minutes before

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Hazardous weather outlook, Jan 15, 11:36 AM CST, 3 hours 34 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.
      </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
Jan 15, 3:10 PM CST	Winter Storm Watch	DMX	Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more	13 hr

Nearby

Wind Chill Advisories in Iowa, 2020 Every wind chill advisory in 2020

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.