Alert archive / Wisconsin / Mesoscale Discussions in 2020

Mesoscale Discussion 960

June 21, 20204 states

The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2020, 6:14 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 21, 2020, 6:14 PM CDT (23:14 UTC)
Expired: Jun 21, 2020, 8:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Concerning: Severe thunderstorm watch 292

All 45 counties

Cerro Gordo County, IA, Emmet County, IA, Hancock County, IA, Humboldt County, IA, Kossuth County, IA, Mitchell County, IA, Palo Alto County, IA, Winnebago County, IA, Worth County, IA, Gogebic County, MI, Blue Earth County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Le Sueur County, MN, Martin County, MN, Mower County, MN, Olmsted County, MN, Rice County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Watonwan County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Iron County, WI, Lincoln County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Price County, WI, Rusk County, WI, Saint Croix County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vilas County, WI

The radar

The La Crosse radar (KARX), 106 km from the middle of the area, began a volume at 23:15 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, 11.2 hours before the alert went out and 129 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: 44 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1247 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 125 m²/s²
0-3 km storm-relative helicity: 186 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
Jun 21, 2:19 PM CDT	Mesoscale Discussion	SPC	Monona, Plymouth, Woodbury	116 min
Jun 21, 2:44 PM CDT	Mesoscale Discussion	SPC	Cerro Gordo, Clay, Dickinson, Emmet, Hancock, Kossuth and 7 more	2 hr
Jun 21, 3:19 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Harrison, Ida and 10 more	7 hr
Jun 21, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	Cerro Gordo, Crawford, Emmet, Hancock, Howard, Humboldt and 8 more	6 hr
Jun 21, 6:59 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Cherokee, Clay, Crawford, Dickinson, Harrison and 10 more	2 hr
Jun 21, 3:22 PM CDT	Mesoscale Discussion	SPC	Gogebic, Ontonagon	113 min

Nearby

Mesoscale Discussions in Wisconsin, 2020 Mesoscale Discussions in Minnesota, 2020 Mesoscale Discussions in Iowa, 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.