Alert archive / Wisconsin / Mesoscale Discussions in 2011

Mesoscale Discussion 1706

July 23, 2011Allamakee County, Winneshiek County, Iowa; Houston County, Minnesota; 7 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2011, 1:10 PM CDT for Allamakee County, Winneshiek County, Iowa; Houston County, Minnesota; 7 counties in Wisconsin. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2011, 1:10 PM CDT (18:10 UTC)
Expired: Jul 23, 2011, 2:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center

Counties Allamakee County, IA, Winneshiek County, IA, Houston County, MN, Crawford County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 20 km from the middle of the area, began a volume at 18:11 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, 6.2 hours before the alert went out and 243 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: 1467 J/kg
Mixed-layer CIN: -142 J/kg
Mixed-layer LCL: 875 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 175 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.2

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
Jul 22, 7:38 PM CDT	Mesoscale Discussion	SPC	Benton, Black Hawk, Bremer, Buchanan, Butler, Cedar and 19 more	97 min
Jul 23, 10:14 AM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Howard, Winneshiek	4 hr
Jul 23, 1:52 PM CDT	Mesoscale Discussion	SPC	Clay, Dickinson, Emmet, Hancock, Kossuth, Lyon and 6 more	83 min
Jul 23, 4:57 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Cass, Clarke, Dallas and 26 more	93 min
Jul 23, 5:16 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Cass, Clarke, Davis and 25 more	4 hr
Jul 22, 10:11 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Grant, Norman, Otter Tail, Wilkin	64 min
Jul 22, 10:15 PM CDT	Severe Thunderstorm Watch	SPC	Becker, Clay, Clearwater, Grant, Hubbard, Mahnomen and 6 more	7 hr
Jul 23, 1:25 AM CDT	Mesoscale Discussion	SPC	Becker, Big Stone, Clay, Clearwater, Douglas, Grant and 13 more	35 min
Jul 23, 1:41 AM CDT	Severe Thunderstorm Watch	SPC	Becker, Benton, Big Stone, Chippewa, Douglas, Grant and 20 more	5 hr
Jul 23, 4:38 AM CDT	Mesoscale Discussion	SPC	Aitkin, Anoka, Becker, Benton, Big Stone, Carver and 36 more	67 min
Jul 23, 9:37 AM CDT	Mesoscale Discussion	SPC	Fillmore, Houston, Olmsted, Wabasha, Winona	53 min
Jul 23, 5:26 PM CDT	Mesoscale Discussion	SPC	Adams, Clark, Eau Claire, Jackson, Juneau, Marathon and 9 more	64 min
Jul 23, 6:36 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Clark, Columbia, Dane, Dodge, Fond du Lac and 19 more	7 hr

Nearby

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