Alert archive / Minnesota / Winter Weather Advisories in 2021

Winter Weather Advisory 12, NWS Grand Forks, ND

December 15, 202117 counties in North Dakota; 18 counties in Minnesota

NWS Grand Forks, ND issued this winter weather advisory at Dec 15, 2021, 3:25 AM CST for 17 counties in North Dakota; 18 counties in Minnesota. It took effect at Dec 15, 2021, 6:00 PM CST. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Dec 15, 2021, 3:25 AM CST (09:25 UTC)
In effect from: Dec 15, 2021, 6:00 PM CST
Expired: Dec 16, 2021, 10:00 AM CST
In force: 16 hr
Issued by: NWS Grand Forks, ND

All 35 counties

Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard County, MN, Kittson County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Benson County, ND, Cass County, ND, Cavalier County, ND, Eddy County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Pembina County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Towner County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 32 km from the middle of the area, began a volume at 09:26 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

International Fa, MN (KINL), launched 00:00Z, 9.4 hours before the alert went out and 290 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: 1038 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 439 m²/s²
0-3 km storm-relative helicity: 490 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 Grand Forks, ND wrote its last area forecast discussion before this winter weather advisory went out at Dec 14, 10:42 PM CST, 4 hours 43 minutes earlier.

Area forecast discussion, Dec 14, 10:42 PM CST, 4 hours 43 minutes before

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Hazardous weather outlook, Dec 14, 10:46 PM CST, 4 hours 39 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 Grand Forks, ND issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 15, 6:43 AM CST	Dense Fog Advisory	FGF	Barnes, Cass, Grand Forks, Pembina, Ransom, Richland and 4 more	13 hr
Dec 15, 3:33 PM CST	Winter Storm Warning	FGF	Becker, Beltrami, Clearwater, Grant, Hubbard, Lake of the Woods and 3 more	18 hr
Dec 15, 3:34 PM CST	Dense Fog Advisory	FGF	Becker, Clay, Grant, Kittson, Mahnomen, Marshall and 7 more	4 hr

Nearby

Winter Weather Advisories in Minnesota, 2021 Winter Weather Advisories in North Dakota, 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.