Alert archive / Minnesota / Mesoscale Discussions in 2005

Mesoscale Discussion 2140

September 4, 2005Allamakee County, Winneshiek County, Iowa; 40 counties in Minnesota; 11 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Sep 4, 2005, 2:12 AM CDT for Allamakee County, Winneshiek County, Iowa; 40 counties in Minnesota; 11 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 4, 2005, 2:12 AM CDT (07:12 UTC)
Expired: Sep 4, 2005, 4:15 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 53 counties

Allamakee County, IA, Winneshiek County, IA, Anoka County, MN, Benton County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Dakota County, MN, Dodge County, MN, Douglas County, MN, Fillmore County, MN, Goodhue County, MN, Grant County, MN, Hennepin County, MN, Houston County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Pope County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Sibley County, MN, Stearns County, MN, Steele County, MN, Stevens County, MN, Swift County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Winona County, MN, Wright County, MN, Yellow Medicine County, MN, Buffalo County, WI, Crawford County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, La Crosse County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The Minneapolis radar (KMPX), 76 km from the middle of the area, began a volume at 07:12 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, 7.2 hours before the alert went out and 361 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: 12 J/kg
Mixed-layer CIN: -158 J/kg
Mixed-layer LCL: 2071 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Sep 3, 8:35 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Winneshiek	7 hr
Sep 3, 9:21 PM CDT	Mesoscale Discussion	SPC	Allamakee, Winneshiek	114 min
Sep 3, 11:18 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clay and 16 more	87 min

Nearby

Mesoscale Discussions in Minnesota, 2005 Mesoscale Discussions in Wisconsin, 2005 Mesoscale Discussions in Iowa, 2005 Every mesoscale discussion in 2005

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.