Alert archive / Wisconsin / Winter Weather Advisories in 2021

Winter Weather Advisory 18, NWS Green Bay, WI

December 9, 20218 counties in Wisconsin

NWS Green Bay, WI issued this winter weather advisory at Dec 9, 2021, 2:36 PM CST for 8 counties in Wisconsin. It took effect at Dec 10, 2021, 3:00 PM CST. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued: Dec 9, 2021, 2:36 PM CST (20:36 UTC)
In effect from: Dec 10, 2021, 3:00 PM CST
Expired: Dec 11, 2021, 12:00 PM CST
In force: 21 hr
Issued by: NWS Green Bay, WI

Counties Brown County, WI, Calumet County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Outagamie County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 20 km from the middle of the area, began a volume at 20:40 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, 8.6 hours before the alert went out and 18 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: 953 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 321 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 Green Bay, WI wrote its last area forecast discussion before this winter weather advisory went out at Dec 9, 11:58 AM CST, 2 hours 38 minutes earlier.

Area forecast discussion, Dec 9, 11:58 AM CST, 2 hours 38 minutes before

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Hazardous weather outlook, Dec 9, 5:27 AM CST, 9 hours 9 minutes before

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In the hours before

Local storm report, Dec 9, 2:17 PM CST, 19 minutes before

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The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 9, 3:19 AM CST	Winter Storm Watch	GRB	Florence, Forest, Langlade, Lincoln, Marathon, Marinette and 9 more	11 hr
Dec 9, 2:36 PM CST	Winter Storm Warning	GRB	Florence, Forest, Langlade, Lincoln, Marathon, Marinette and 8 more	45 hr

Nearby

Winter Weather Advisories in Wisconsin, 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.