Alert archive / Illinois / Mesoscale Discussions in 2011

Mesoscale Discussion 1571

July 11, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 11, 2011, 5:07 AM CDT for 4 states. It was in force for 113 min.

The area

The outline as issued.

The facts

Issued: Jul 11, 2011, 5:07 AM CDT (10:07 UTC)
Expired: Jul 11, 2011, 7:00 AM CDT
In force: 113 min
Issued by: the Storm Prediction Center

All 71 counties

Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Tama County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Lake County, MI, Manistee County, MI, Mason County, MI, Muskegon County, MI, Newaygo County, MI, Oceana County, MI, Ottawa County, MI, Crawford 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, Richland County, WI, Rock County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 87 km from the middle of the area, began a volume at 10:08 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.

Severe Thunderstorm Watch 625Jul 11, 5:35 AM CDT

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.1 hours before the alert went out and 133 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: 3733 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 850 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 3.4
Supercell composite: 14.3

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 11, 3:30 AM CDT	Severe Thunderstorm Watch	SPC	Bureau, Carroll, Henry, Jo Daviess, Mercer, Putnam and 3 more	6 hr
Jul 11, 5:37 AM CDT	Severe Thunderstorm Watch	SPC	Boone, Cook, DeKalb, DuPage, Grundy, Kane and 9 more	6 hr
Jul 11, 7:10 AM CDT	Mesoscale Discussion	SPC	Boone, Bureau, Cass, Cook, DeKalb, DuPage and 27 more	95 min
Jul 11, 7:50 AM CDT	Mesoscale Discussion	SPC	Champaign, Clark, Coles, Cook, DeWitt, Douglas and 14 more	55 min
Jul 11, 5:16 PM CDT	Mesoscale Discussion	SPC	Cass, Champaign, DeWitt, Douglas, Ford, Fulton and 19 more	59 min
Jul 10, 7:51 PM CDT	Mesoscale Discussion	SPC	Allamakee, Howard, Mitchell, Winneshiek	84 min
Jul 10, 9:53 PM CDT	Mesoscale Discussion	SPC	Allamakee, Cerro Gordo, Chickasaw, Dickinson, Emmet, Floyd and 9 more	67 min
Jul 10, 10:10 PM CDT	Severe Thunderstorm Watch	SPC	Allamakee, Black Hawk, Bremer, Butler, Cerro Gordo, Chickasaw and 13 more	6 hr
Jul 10, 10:27 PM CDT	Mesoscale Discussion	SPC	Cherokee, Harrison, Monona, Plymouth, Sioux, Woodbury	63 min
Jul 10, 10:57 PM CDT	Severe Thunderstorm Watch	SPC	Harrison, Mills, Monona, Montgomery, Pottawattamie, Shelby	4 hr
Jul 10, 11:45 PM CDT	Mesoscale Discussion	SPC	Allamakee, Bremer, Cerro Gordo, Chickasaw, Clayton, Delaware and 8 more	90 min
Jul 10, 11:56 PM CDT	Severe Thunderstorm Watch	SPC	Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more	4 hr
Jul 11, 1:08 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more	13 min
Jul 11, 1:21 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Audubon, Black Hawk, Boone, Bremer and 38 more	4 hr
Jul 11, 2:36 AM CDT	Mesoscale Discussion	SPC	Adair, Adams, Benton, Black Hawk, Boone, Bremer and 52 more	114 min
Jul 11, 8:07 AM CDT	Severe Thunderstorm Watch	SPC	Bay, Genesee, Huron, Lapeer, Lenawee, Livingston and 11 more	4 hr
Jul 11, 9:55 AM CDT	Mesoscale Discussion	SPC	Allegan, Barry, Branch, Calhoun, Cass, Clinton and 14 more	65 min
Jul 11, 11:34 AM CDT	Mesoscale Discussion	SPC	Lenawee, Macomb, Monroe, Oakland, Washtenaw, Wayne	56 min
Jul 11, 2:07 AM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Columbia, Dodge and 27 more	83 min

Nearby

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