Alert archive / Minnesota / Winter Storm Warnings in 2018

Winter Storm Warning 16, NWS Duluth, MN

December 30, 20187 counties in Minnesota; 4 counties in Wisconsin

NWS Duluth, MN issued this winter storm warning at Dec 30, 2018, 2:03 PM CST for 7 counties in Minnesota; 4 counties in Wisconsin. It took effect at Dec 31, 2018, 12:00 AM CST. It was in force for 30 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 30, 2018, 2:03 PM CST (20:03 UTC)
In effect from: Dec 31, 2018, 12:00 AM CST
Expired: Jan 1, 2019, 6:00 AM CST
In force: 30 hr
Issued by: NWS Duluth, MN

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Douglas County, WI, Iron County, WI

The radar

The Duluth radar (KDLH), 15 km from the middle of the area, began a volume at 20:08 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.1 hours before the alert went out and 409 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: 918 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 306 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 30, 11:30 AM CST, 2 hours 33 minutes earlier.

Area forecast discussion, Dec 30, 11:30 AM CST, 2 hours 33 minutes before

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Hazardous weather outlook, Dec 30, 9:24 AM CST, 4 hours 39 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 30, 3:52 AM CST	Winter Storm Watch	DLH	Carlton, Saint Louis	10 hr
Dec 30, 2:03 PM CST	Winter Weather Advisory	DLH	Aitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 3 more	28 hr
Dec 30, 2:24 PM CST	Gale Warning	DLH		31 hr
Dec 30, 2:24 PM CST	Small Craft Advisory	DLH		13 hr

Nearby

Winter Storm Warnings in Minnesota, 2018 Winter Storm Warnings in Wisconsin, 2018 Every winter storm warning in 2018

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.