Alert archive / South Dakota / Winter Weather Advisories in 2021

Winter Weather Advisory 11, NWS Sioux Falls, SD

March 14, 202118 counties in South Dakota; Ida County, Plymouth County, Woodbury County, Iowa

NWS Sioux Falls, SD issued this winter weather advisory at Mar 14, 2021, 4:03 AM CDT for 18 counties in South Dakota; Ida County, Plymouth County, Woodbury County, Iowa. It took effect at Mar 14, 2021, 4:00 PM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Mar 14, 2021, 4:03 AM CDT (09:03 UTC)
In effect from: Mar 14, 2021, 4:00 PM CDT
Expired: Mar 15, 2021, 10:00 AM CDT
In force: 18 hr
Issued by: NWS Sioux Falls, SD

All 21 counties

Ida County, IA, Plymouth County, IA, Woodbury County, IA, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brule County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hutchinson County, SD, Jerauld County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 81 km from the middle of the area, began a volume at 09:04 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

Omaha, NE (KOAX), launched 00:00Z, 9.1 hours before the alert went out and 252 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: 1526 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 68 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 winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before this winter weather advisory went out at Mar 13, 11:06 PM CST, 3 hours 57 minutes earlier.

Area forecast discussion, Mar 13, 11:06 PM CST, 3 hours 57 minutes before

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Hazardous weather outlook, Mar 13, 7:53 PM CST, 7 hours 10 minutes before

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</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 Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 14, 4:03 AM CDT	Winter Storm Warning	FSD	Aurora, Brookings, Brule, Charles Mix, Douglas, Gregory and 6 more	32 hr

Nearby

Winter Weather Advisories in South Dakota, 2021 Winter Weather Advisories in Iowa, 2021 Every winter weather advisory in 2021

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.