Alert archive / Illinois / Mesoscale Discussions in 2011
Mesoscale Discussion 1337
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 11:45 AM CDT for 4 states. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2011, 11:45 AM CDT (16:45 UTC)
- Expired
- Jun 21, 2011, 2:15 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 94 counties
Allamakee County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Howard County, IA, Jackson County, IA, Jones County, IA, Scott County, IA, Winneshiek County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Marshall County, IL, Mason County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Calumet County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Eau Claire County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Monroe County, WI, Ozaukee County, WI, Pepin County, WI, Pierce County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The Milwaukee radar (KMKX), 117 km from the middle of the area, began a volume at 16:45 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
Davenport, (KDVN), launched 12:00Z, 4.8 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.
- Mixed-layer CAPE
- 12 J/kg
- Mixed-layer CIN
- -422 J/kg
- Mixed-layer LCL
- 1767 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -64 m²/s²
- 0-3 km storm-relative helicity
- -114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 12:56 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Christian, Clay, Clinton and 40 more | 64 min |
| Jun 21, 1:22 PM CDT | Tornado Watch | SPC | Alexander, Bond, Calhoun, Cass, Champaign, Christian and 49 more | 9 hr |
| Jun 21, 3:31 PM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Cass, Champaign, Christian and 46 more | 89 min |
| Jun 21, 4:56 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Bureau, Cass, Champaign, Christian and 68 more | 94 min |
| Jun 21, 5:42 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more | 4 hr |
| Jun 20, 7:46 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Carroll, Cass, Crawford and 12 more | 59 min |
| Jun 20, 9:02 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 21 more | 58 min |
| Jun 20, 10:22 PM CDT | Mesoscale Discussion | SPC | Appanoose, Benton, Black Hawk, Boone, Bremer, Buchanan and 48 more | 83 min |
| Jun 20, 10:58 PM CDT | Tornado Watch | SPC | Appanoose, Black Hawk, Bremer, Butler, Cerro Gordo, Davis and 17 more | 4 hr |
| Jun 21, 1:25 AM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Bremer, Buchanan, Butler, Chickasaw and 14 more | 35 min |
| Jun 21, 2:11 PM CDT | Tornado Watch | SPC | Anoka, Chisago, Dakota, Goodhue, Hennepin, Houston and 7 more | 7 hr |
Nearby
Mesoscale Discussions in Illinois, 2011Mesoscale Discussions in Wisconsin, 2011Mesoscale Discussions in Iowa, 2011Every 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.