Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1466

July 1, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2011, 10:04 PM CDT for 4 states. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jul 1, 2011, 10:04 PM CDT (03:04 UTC)
Expired: Jul 2, 2011, 12:00 AM CDT
In force: 116 min
Issued by: the Storm Prediction Center

All 56 counties

Allamakee County, IA, Black Hawk County, IA, Bremer County, IA, Butler County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Baraga County, MI, Dickinson County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Marquette County, MI, Ontonagon County, MI, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Winona County, MN, Ashland County, WI, Bayfield County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Monroe County, WI, Oneida County, WI, Portage County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Washburn County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 114 km from the middle of the area, began a volume at 03:07 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 00:00Z, 3.1 hours before the alert went out and 162 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: 4059 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 1509 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 178 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 20.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 1, 7:35 PM CDT	Mesoscale Discussion	SPC	Allamakee, Boone, Bremer, Butler, Calhoun, Carroll and 22 more	55 min
Jul 1, 8:07 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Floyd and 13 more	5 hr
Jul 1, 11:38 PM CDT	Mesoscale Discussion	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 5 more	97 min
Jul 2, 1:06 PM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Bay, Berrien, Branch, Calhoun and 32 more	54 min
Jul 2, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	Alcona, Allegan, Arenac, Barry, Bay, Berrien and 37 more	9 hr
Jul 2, 6:17 PM CDT	Mesoscale Discussion	SPC	Branch, Calhoun, Cass, Eaton, Genesee, Hillsdale and 16 more	58 min

Nearby

Mesoscale Discussions in Wisconsin, 2011 Mesoscale Discussions in Iowa, 2011 Mesoscale Discussions in Michigan, 2011 Every mesoscale discussion in 2011

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.