Alert archive / Wisconsin / Mesoscale Discussions in 2007

Mesoscale Discussion 1842

August 22, 20076 counties in Illinois; Jackson County, Iowa; 21 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 22, 2007, 2:13 AM CDT for 6 counties in Illinois; Jackson County, Iowa; 21 counties in Wisconsin. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Aug 22, 2007, 2:13 AM CDT (07:13 UTC)
Expired: Aug 22, 2007, 3:15 AM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 28 counties

Jackson County, IA, Boone County, IL, Jo Daviess County, IL, Lake County, IL, McHenry County, IL, Stephenson County, IL, Winnebago County, IL, Calumet County, WI, Columbia County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette 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), 64 km from the middle of the area, began a volume at 07:13 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 186 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: 4094 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 915 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 114 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.0

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
Aug 21, 10:49 PM CDT	Mesoscale Discussion	SPC	Carroll, Jo Daviess, Stephenson, Whiteside	86 min
Aug 22, 4:53 AM CDT	Mesoscale Discussion	SPC	Kankakee, Will	67 min
Aug 22, 3:17 PM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Carroll, DeKalb, DuPage, Ford and 28 more	2 hr
Aug 21, 8:14 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Buchanan, Chickasaw, Clayton, Delaware, Dubuque and 5 more	8 hr
Aug 22, 6:45 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Clay, Crawford and 13 more	60 min
Aug 22, 10:12 AM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Cherokee, Clay, Crawford, Humboldt and 8 more	93 min
Aug 22, 2:37 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 40 more	83 min
Aug 22, 3:20 PM CDT	Severe Thunderstorm Watch	SPC	Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more	6 hr
Aug 22, 6:33 PM CDT	Mesoscale Discussion	SPC	Fremont, Harrison, Mills, Montgomery, Page, Pottawattamie and 1 more	87 min
Aug 22, 12:09 AM CDT	Severe Thunderstorm Watch	SPC	Columbia, Dane, Dodge, Fond du Lac, Green, Green Lake and 11 more	3 hr

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.