Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 1334
The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2011, 10:22 PM CDT for 54 counties in Iowa; 7 counties in Minnesota; 20 counties in Missouri. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2011, 10:22 PM CDT (03:22 UTC)
- Expired
- Jun 20, 2011, 11:45 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 81 counties
Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Clay County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jasper County, IA, Keokuk County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Story County, IA, Tama County, IA, Union County, IA, Wapello County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Faribault County, MN, Freeborn County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Waseca County, MN, Adair County, MO, Caldwell County, MO, Carroll County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Jackson County, MO, Lafayette County, MO, Linn County, MO, Livingston County, MO, Mercer County, MO, Putnam County, MO, Ray County, MO, Schuyler County, MO, Sullivan County, MO
The radar
The Des Moines radar (KDMX), 9 km from the middle of the area, began a volume at 03:21 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
Omaha, NE (KOAX), launched 00:00Z, 3.4 hours before the alert went out and 218 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
- 4194 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 182 m²/s²
- Significant tornado parameter
- 4.6
- Supercell composite
- 17.5
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 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, 10:58 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, 11:45 AM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Clinton, Delaware, Dubuque, Fayette and 5 more | 3 hr |
| Jun 21, 2:11 PM CDT | Tornado Watch | SPC | Anoka, Chisago, Dakota, Goodhue, Hennepin, Houston and 7 more | 7 hr |
| Jun 20, 8:32 PM CDT | Tornado Watch | SPC | Adair, Andrew, Atchison, Barton, Bates, Benton and 40 more | 4 hr |
| Jun 20, 9:46 PM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Benton, Cedar, Christian, Dade and 12 more | 9 hr |
| Jun 21, 3:15 AM CDT | Mesoscale Discussion | SPC | Barry, Christian, Dade, Greene, Jasper, Lawrence and 5 more | 60 min |
| Jun 21, 12:56 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 22 more | 64 min |
| Jun 21, 1:22 PM CDT | Tornado Watch | SPC | Bollinger, Cape Girardeau, Carter, Crawford, Dent, Franklin and 15 more | 9 hr |
| Jun 21, 3:31 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Jefferson and 15 more | 89 min |
Nearby
Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Minnesota, 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.