Alert archive / Illinois / Mesoscale Discussions in 2004

Mesoscale Discussion 1197

June 11, 200420 counties in Illinois; Jackson County, Iowa; Grant County, Green County, Lafayette County, Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2004, 5:56 PM CDT for 20 counties in Illinois; Jackson County, Iowa; Grant County, Green County, Lafayette County, Wisconsin. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 11, 2004, 5:56 PM CDT (22:56 UTC)
Expired: Jun 11, 2004, 7:30 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 24 counties

Jackson County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Grant County, WI, Green County, WI, Lafayette County, WI

The radar

The Quad Cities radar (KDVN), 107 km from the middle of the area, began a volume at 22:57 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.9 hours before the alert went out and 286 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 82 m²/s²
0-3 km storm-relative helicity: 101 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
Jun 10, 7:58 PM CDT	Mesoscale Discussion	SPC	Bureau, Carroll, Champaign, DeWitt, Douglas, Edgar and 27 more	92 min
Jun 10, 9:50 PM CDT	Tornado Watch	SPC	Cook, DuPage, Kankakee, Will	5 hr
Jun 11, 6:20 PM CDT	Tornado Watch	SPC	Boone, Bureau, Carroll, DeKalb, Grundy, Jo Daviess and 10 more	5 hr
Jun 11, 1:28 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 20 more	62 min
Jun 11, 10:10 AM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 14 more	95 min
Jun 11, 12:55 PM CDT	Mesoscale Discussion	SPC	Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo, Cherokee and 23 more	3 hr
Jun 11, 1:45 PM CDT	Tornado Watch	SPC	Black Hawk, Bremer, Buena Vista, Butler, Calhoun, Cerro Gordo and 20 more	5 hr
Jun 11, 3:03 PM CDT	Mesoscale Discussion	SPC	Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Chickasaw and 19 more	87 min
Jun 11, 4:55 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Audubon, Boone, Carroll, Cass and 20 more	95 min
Jun 11, 5:00 PM CDT	Tornado Watch	SPC	Allamakee, Black Hawk, Bremer, Buchanan, Butler, Calhoun and 26 more	6 hr

Nearby

Mesoscale Discussions in Illinois, 2004 Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in Iowa, 2004 Every mesoscale discussion in 2004

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.