Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1806

July 31, 201117 counties in Minnesota; 34 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 31, 2011, 2:23 PM CDT for 17 counties in Minnesota; 34 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jul 31, 2011, 2:23 PM CDT (19:23 UTC)
Expired: Jul 31, 2011, 4:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 51 counties

Anoka County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Goodhue County, MN, Hennepin County, MN, Le Sueur County, MN, McLeod County, MN, Meeker County, MN, Nicollet County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Wabasha County, MN, Washington County, MN, Wright County, MN, Adams County, WI, Barron County, WI, Brown County, WI, Buffalo County, WI, Calumet County, WI, Chippewa County, WI, Clark County, WI, Dunn County, WI, Eau Claire County, WI, Jackson County, WI, Juneau County, WI, Kewaunee County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Rusk County, WI, Saint Croix County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 124 km from the middle of the area, began a volume at 19:26 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.4 hours before the alert went out and 191 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: 1057 J/kg
Mixed-layer CIN: -138 J/kg
Mixed-layer LCL: 1170 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 73 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
Jul 30, 8:57 PM CDT	Mesoscale Discussion	SPC	Anoka, Benton, Carver, Chippewa, Chisago, Dakota and 20 more	93 min
Jul 30, 11:07 PM CDT	Mesoscale Discussion	SPC	Carver, Dakota, Goodhue, Hennepin, Le Sueur, McLeod and 7 more	53 min
Jul 31, 12:50 PM CDT	Mesoscale Discussion	SPC	Big Stone, Brown, Chippewa, Cottonwood, Kandiyohi, Lac qui Parle and 12 more	2 hr
Jul 30, 7:38 PM CDT	Mesoscale Discussion	SPC	Barron, Burnett, Chippewa, Dunn, Eau Claire, Pepin and 6 more	97 min

Nearby

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