Alert archive / Wisconsin / Mesoscale Discussions in 2020

Mesoscale Discussion 962

June 21, 202019 counties in Iowa; Fillmore County, Houston County, Winona County, Minnesota; 20 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2020, 9:09 PM CDT for 19 counties in Iowa; Fillmore County, Houston County, Winona County, Minnesota; 20 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2020, 9:09 PM CDT (02:09 UTC)
Expired: Jun 21, 2020, 11:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe potential...watch unlikely
Chance of a watch: 20%

All 42 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hardin County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Wright County, IA, Fillmore County, MN, Houston County, MN, Winona County, MN, Adams County, WI, Clark County, WI, Crawford County, WI, Grant County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Monroe County, WI, Portage County, WI, Richland County, WI, Sauk County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 27 km from the middle of the area, began a volume at 02:14 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

Davenport, (KDVN), launched 00:00Z, 2.2 hours before the alert went out and 231 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: 751 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1523 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 104 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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Nearby

Mesoscale Discussions in Wisconsin, 2020 Mesoscale Discussions in Iowa, 2020 Mesoscale Discussions in Minnesota, 2020 Every mesoscale discussion 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.