Alert archive / Minnesota / Dense Fog Advisories in 2021

Dense Fog Advisory 15, NWS Grand Forks, ND

December 15, 202110 counties in North Dakota; 18 counties in Minnesota

NWS Grand Forks, ND issued this dense fog advisory at Dec 15, 2021, 6:43 AM CST for 10 counties in North Dakota; 18 counties in Minnesota. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Dec 15, 2021, 6:43 AM CST (12:43 UTC)
Expired: Dec 15, 2021, 8:00 PM CST
In force: 13 hr
Issued by: NWS Grand Forks, ND

All 28 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, Grand Forks County, ND, Pembina County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 68 km from the middle of the area, began a volume at 12:42 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, 0.7 hours before the alert went out and 317 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: 1817 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 130 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 Dec 15, 3:44 AM CST, 2 hours 59 minutes earlier.

Area forecast discussion, Dec 15, 3:44 AM CST, 2 hours 59 minutes before

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Hazardous weather outlook, Dec 14, 10:46 PM CST, 7 hours 57 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 15, 3:25 AM CST	Winter Weather Advisory	FGF	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 11 more	31 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

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.