Alert archive / Minnesota / Winter Storm Warnings in 2020

Winter Storm Warning 7, NWS Duluth, MN

December 22, 202010 counties in Minnesota; 6 counties in Wisconsin

NWS Duluth, MN issued this winter storm warning at Dec 22, 2020, 3:22 PM CST for 10 counties in Minnesota; 6 counties in Wisconsin. It took effect at Dec 22, 2020, 10:00 PM CST. It was in force for 50 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 22, 2020, 3:22 PM CST (21:22 UTC)
In effect from: Dec 22, 2020, 10:00 PM CST
Expired: Dec 25, 2020, 12:00 AM CST
In force: 50 hr
Issued by: NWS Duluth, MN

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Cook County, MN, Crow Wing County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 9 km from the middle of the area, began a volume at 21:22 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 12:00Z, 9.4 hours before the alert went out and 208 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: 542 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 245 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 storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Duluth, MN wrote its last area forecast discussion before this winter storm warning went out at Dec 22, 12:21 PM CST, 3 hours 1 minute earlier.

Area forecast discussion, Dec 22, 12:21 PM CST, 3 hours 1 minute before

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Hazardous weather outlook, Dec 22, 12:01 PM CST, 3 hours 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 22, 4:10 AM CST	Small Craft Advisory	DLH		30 hr
Dec 22, 5:25 AM CST	Winter Storm Watch	DLH	Aitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 4 more	22 hr
Dec 22, 5:25 AM CST	Winter Weather Advisory	DLH	Cook, Itasca, Koochiching, Lake, Saint Louis	10 hr
Dec 22, 10:18 AM CST	Gale Watch	DLH		18 hr

Nearby

Winter Storm Warnings in Minnesota, 2020 Winter Storm Warnings in Wisconsin, 2020 Every winter storm warning 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.