Alert archive / Minnesota / Winter Weather Advisories in 2021

Winter Weather Advisory 11, NWS Grand Forks, ND

December 4, 20214 counties in North Dakota; 17 counties in Minnesota

NWS Grand Forks, ND issued this winter weather advisory at Dec 4, 2021, 2:05 PM CST for 4 counties in North Dakota; 17 counties in Minnesota. It took effect at Dec 4, 2021, 6:00 PM CST. It was in force for 36 hr.

The area

The counties it named.

The facts

Issued: Dec 4, 2021, 2:05 PM CST (20:05 UTC)
In effect from: Dec 4, 2021, 6:00 PM CST
Expired: Dec 6, 2021, 6:00 AM CST
In force: 36 hr
Issued by: NWS Grand Forks, ND

All 21 counties

Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard 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, Ransom County, ND, Richland County, ND, Sargent County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 96 km from the middle of the area, began a volume at 20:03 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, 8.1 hours before the alert went out and 329 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: 1886 m above ground
0-6 km bulk shear: 91 kt
0-1 km storm-relative helicity: -131 m²/s²
0-3 km storm-relative helicity: -27 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 4, 12:41 PM CST, 1 hour 24 minutes earlier.

Area forecast discussion, Dec 4, 12:41 PM CST, 1 hour 24 minutes before

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Hazardous weather outlook, Dec 4, 4:22 AM CST, 9 hours 43 minutes before

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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 4, 3:52 AM CST	Winter Storm Warning	FGF	Benson, Cass, Cavalier, Eddy, Grand Forks, Griggs and 7 more	47 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.