Alert archive / Wisconsin / Winter Weather Advisories in 2021

Winter Weather Advisory 15, NWS La Crosse, WI

December 26, 202112 counties in Wisconsin; Allamakee County, Howard County, Winneshiek County, Iowa; 7 counties in Minnesota

NWS La Crosse, WI issued this winter weather advisory at Dec 26, 2021, 2:27 AM CST for 12 counties in Wisconsin; Allamakee County, Howard County, Winneshiek County, Iowa; 7 counties in Minnesota. It took effect at Dec 26, 2021, 6:00 PM CST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Dec 26, 2021, 2:27 AM CST (08:27 UTC)
In effect from: Dec 26, 2021, 6:00 PM CST
Expired: Dec 27, 2021, 12:00 PM CST
In force: 18 hr
Issued by: NWS La Crosse, WI

All 22 counties

Allamakee County, IA, Howard County, IA, Winneshiek County, IA, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Clark County, WI, Crawford County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 8.5 hours before the alert went out and 206 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: 2362 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 248 m²/s²
0-3 km storm-relative helicity: 744 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 La Crosse, WI wrote its last area forecast discussion before this winter weather advisory went out at Dec 25, 10:49 PM CST, 3 hours 38 minutes earlier.

Area forecast discussion, Dec 25, 10:49 PM CST, 3 hours 38 minutes before

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Nearby

Winter Weather Advisories in Wisconsin, 2021 Winter Weather Advisories in Minnesota, 2021 Winter Weather Advisories in Iowa, 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.