Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1730

August 12, 200714 counties in Illinois; Jackson County, Iowa; 20 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2007, 1:20 AM CDT for 14 counties in Illinois; Jackson County, Iowa; 20 counties in Wisconsin. It was in force for 25 min.

The area

The outline as issued.

The facts

Issued: Aug 12, 2007, 1:20 AM CDT (06:20 UTC)
Expired: Aug 12, 2007, 1:45 AM CDT
In force: 25 min
Issued by: the Storm Prediction Center

All 35 counties

Jackson County, IA, Boone County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Calumet County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Manitowoc County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Winnebago County, WI

The radar

The Milwaukee radar (KMKX), 49 km from the middle of the area, began a volume at 06:22 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, 6.3 hours before the alert went out and 179 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: 1137 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1520 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.9

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 12, 3:05 AM CDT	Mesoscale Discussion	SPC	Cook, DuPage, Grundy, Kane, Kankakee, Kendall and 2 more	55 min
Aug 11, 9:43 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Buchanan, Chickasaw, Clayton, Delaware and 3 more	92 min
Aug 11, 9:57 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Howard, Mitchell, Winneshiek	5 hr
Aug 11, 11:46 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Mitchell, Winneshiek	119 min
Aug 12, 2:52 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Clarke, Decatur and 12 more	83 min
Aug 12, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Cass, Clarke and 16 more	7 hr
Aug 12, 5:49 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Cass, Dallas, Guthrie and 9 more	86 min
Aug 11, 8:45 PM CDT	Mesoscale Discussion	SPC	Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 10 more	90 min

Nearby

Mesoscale Discussions in Wisconsin, 2007 Mesoscale Discussions in Illinois, 2007 Mesoscale Discussions in Iowa, 2007 Every mesoscale discussion in 2007

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.