Alert archive / Minnesota / Winter Weather Advisories in 2020

Winter Weather Advisory 16, NWS Twin Cities, MN

October 21, 202013 counties in Minnesota

NWS Twin Cities, MN issued this winter weather advisory at Oct 21, 2020, 3:10 PM CDT for 13 counties in Minnesota. It took effect at Oct 22, 2020, 4:00 AM CDT. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Oct 21, 2020, 3:10 PM CDT (20:10 UTC)
In effect from: Oct 22, 2020, 4:00 AM CDT
Expired: Oct 22, 2020, 10:00 PM CDT
In force: 18 hr
Issued by: NWS Twin Cities, MN

Counties Benton County, MN, Chippewa County, MN, Kanabec County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Meeker County, MN, Mille Lacs County, MN, Pope County, MN, Redwood County, MN, Renville County, MN, Stearns County, MN, Swift County, MN, Yellow Medicine County, MN

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 20:12 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

Aberdeen, SD (KABR), launched 12:00Z, 8.2 hours before the alert went out and 276 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: 1096 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: -109 m²/s²
0-3 km storm-relative helicity: -31 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 Twin Cities, MN wrote its last area forecast discussion before this winter weather advisory went out at Oct 21, 12:56 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Oct 21, 12:56 PM CDT, 2 hours 14 minutes before

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Hazardous weather outlook, Oct 21, 4:24 AM CDT, 10 hours 46 minutes before

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In the hours before

Local storm report, Oct 21, 10:58 AM CDT, 4 hours 12 minutes before

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Local storm report, Oct 21, 12:00 PM CDT, 3 hours 10 minutes before

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      <p id="message1">
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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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Local storm report, Oct 21, 12:02 PM CDT, 3 hours 8 minutes before

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      <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.
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      <p id="message2">
        Please try again in a few minutes.
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      <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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Local storm report, Oct 21, 12:05 PM CDT, 3 hours 5 minutes before

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      <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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      <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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Local storm report, Oct 21, 12:31 PM CDT, 2 hours 39 minutes before

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<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.
      </p>
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Local storm report, Oct 21, 2:02 PM CDT, 1 hour 8 minutes before

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<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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
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The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 21, 4:07 AM CDT	Winter Storm Watch	MPX	Benton, Douglas, Kanabec, Mille Lacs, Morrison, Pope and 4 more	11 hr
Oct 21, 3:10 PM CDT	Winter Storm Warning	MPX	Douglas, Morrison, Stevens, Todd	31 hr

Nearby

Winter Weather Advisories in Minnesota, 2020 Every winter weather 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.