Alert archive / Minnesota / Mesoscale Discussions in 2011

Mesoscale Discussion 2042

August 23, 201129 counties in Iowa; 34 counties in Minnesota; 18 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2011, 4:55 AM CDT for 29 counties in Iowa; 34 counties in Minnesota; 18 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 23, 2011, 4:55 AM CDT (09:55 UTC)
Expired: Aug 23, 2011, 7:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 81 counties

Allamakee County, IA, Benton 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, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Marshall County, IA, Mitchell County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Isanti County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Mille Lacs County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Ramsey County, MN, Redwood County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Clark County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Grant County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Richland County, WI, Saint Croix County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 127 km from the middle of the area, began a volume at 09:55 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, 9.9 hours before the alert went out and 134 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: 114 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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
Aug 23, 12:45 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Benton, Black Hawk, Boone and 56 more	2 hr
Aug 23, 3:00 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 24 more	6 hr
Aug 23, 3:10 AM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Carver, Chippewa, Chisago, Hennepin and 21 more	2 hr
Aug 23, 3:34 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 34 more	4 hr
Aug 23, 4:56 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Fond du Lac, Green Lake and 12 more	94 min
Aug 23, 5:19 PM CDT	Tornado Watch	SPC	Adams, Brown, Calumet, Columbia, Dodge, Fond du Lac and 20 more	6 hr

Nearby

Mesoscale Discussions in Minnesota, 2011 Mesoscale Discussions in Iowa, 2011 Mesoscale Discussions in Wisconsin, 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.