Alert archive / Wisconsin / Mesoscale Discussions in 2019

Mesoscale Discussion 2191

December 9, 20196 counties in Iowa; Houston County, Minnesota; 30 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Dec 9, 2019, 11:18 AM CST for 6 counties in Iowa; Houston County, Minnesota; 30 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Dec 9, 2019, 11:18 AM CST (17:18 UTC)
Expired: Dec 9, 2019, 3:15 PM CST
In force: 4 hr
Issued by: the Storm Prediction Center

All 37 counties

Allamakee County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Winneshiek County, IA, Houston County, MN, Adams County, WI, Clark County, WI, Crawford County, WI, Forest County, WI, Grant County, WI, Green Lake County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Oneida County, WI, Outagamie County, WI, Portage County, WI, Price County, WI, Richland County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Vernon County, WI, Vilas County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 64 km from the middle of the area, began a volume at 17:16 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

Minneapolis, MN (KMPX), launched 12:00Z, 5.3 hours before the alert went out and 266 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: 556 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 286 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 8, 6:48 PM CST	Mesoscale Discussion	SPC	Becker, Beltrami, Cass, Clay, Clearwater, Crow Wing and 12 more	6 hr

Nearby

Mesoscale Discussions in Wisconsin, 2019 Mesoscale Discussions in Iowa, 2019 Mesoscale Discussions in Minnesota, 2019 Every mesoscale discussion in 2019

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.