Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 1690
The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2011, 3:00 PM CDT for 67 counties in Iowa; 38 counties in Minnesota; 18 counties in South Dakota. It was in force for 90 min.
The area
The outline as issued.
The facts
- Issued
- Jul 22, 2011, 3:00 PM CDT (20:00 UTC)
- Expired
- Jul 22, 2011, 4:30 PM CDT
- In force
- 90 min
- Issued by
- the Storm Prediction Center
All 123 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clarke County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Fremont County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Lyon County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mills County, IA, Mitchell County, IA, Monona County, IA, Montgomery County, IA, O'Brien County, IA, Osceola County, IA, Page County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, Martin County, MN, McLeod County, MN, Meeker County, MN, Mower County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Olmsted County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Rock County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Swift County, MN, Waseca County, MN, Watonwan County, MN, Yellow Medicine County, MN, Beadle County, SD, Brookings County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Lincoln County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD, Sanborn County, SD, Spink County, SD, Union County, SD
The radar
The Des Moines radar (KDMX), 149 km from the middle of the area, began a volume at 20:03 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, 8.0 hours before the alert went out and 373 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
- 2442 J/kg
- Mixed-layer CIN
- -94 J/kg
- Mixed-layer LCL
- 1188 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
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 |
|---|---|---|---|---|
| Jul 21, 7:09 PM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Des Moines and 18 more | 96 min |
| Jul 21, 10:44 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page, Pottawattamie | 89 min |
| Jul 22, 5:46 PM CDT | Mesoscale Discussion | SPC | Big Stone, Grant, Stevens, Traverse, Wilkin | 89 min |
| Jul 22, 6:14 PM CDT | Tornado Watch | SPC | Big Stone, Traverse, Wilkin | 8 hr |
| Jul 21, 7:10 PM CDT | Mesoscale Discussion | SPC | Bennett, Jackson, Jones, Lyman, Mellette, Todd and 1 more | 95 min |
| Jul 22, 11:05 AM CDT | Mesoscale Discussion | SPC | Corson, Harding, Perkins | 55 min |
| Jul 22, 5:17 PM CDT | Mesoscale Discussion | SPC | Butte, Harding, Perkins | 88 min |
| Jul 22, 5:35 PM CDT | Tornado Watch | SPC | Campbell, Corson, Dewey, Edmunds, Harding, McPherson and 3 more | 8 hr |
| Jul 22, 6:22 PM CDT | Mesoscale Discussion | SPC | Brule, Buffalo, Gregory, Lyman, Mellette, Todd and 1 more | 53 min |
Nearby
Mesoscale Discussions in Iowa, 2011Mesoscale Discussions in Minnesota, 2011Mesoscale Discussions in South Dakota, 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.