Alert archive / Minnesota / Dense Fog Advisories in 2021

Dense Fog Advisory 3, NWS Grand Forks, ND

January 7, 202115 counties in North Dakota; 18 counties in Minnesota

NWS Grand Forks, ND issued this dense fog advisory at Jan 7, 2021, 9:03 AM CST for 15 counties in North Dakota; 18 counties in Minnesota. It was in force for 26 hr.

The area

The counties it named.

The facts

Issued: Jan 7, 2021, 9:03 AM CST (15:03 UTC)
Expired: Jan 8, 2021, 11:00 AM CST
In force: 26 hr
Issued by: NWS Grand Forks, ND

All 33 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, Cass County, ND, Cavalier 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), 42 km from the middle of the area, began a volume at 15:04 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

Aberdeen, SD (KABR), launched 12:00Z, 3.1 hours before the alert went out and 319 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: 672 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -151 m²/s²
0-3 km storm-relative helicity: -39 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 dense fog 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 dense fog advisory went out at Jan 7, 6:10 AM CST, 2 hours 53 minutes earlier.

Area forecast discussion, Jan 7, 6:10 AM CST, 2 hours 53 minutes before

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Hazardous weather outlook, Jan 7, 4:17 AM CST, 4 hours 46 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
Jan 6, 10:36 PM CST	Dense Fog Advisory	FGF	Barnes, Benson, Cavalier, Eddy, Griggs, Nelson and 6 more	10 hr
Jan 7, 5:02 PM CST	Dense Fog Advisory	FGF	Wadena	18 hr

Nearby

Dense Fog Advisories in Minnesota, 2021 Dense Fog Advisories in North Dakota, 2021 Every dense fog 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.