Alert archive / Iowa / Mesoscale Discussions in 2011
Mesoscale Discussion 1335
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2011, 1:25 AM CDT for 20 counties in Iowa; 7 counties in Minnesota. It was in force for 35 min.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2011, 1:25 AM CDT (06:25 UTC)
- Expired
- Jun 21, 2011, 2:00 AM CDT
- In force
- 35 min
- Issued by
- the Storm Prediction Center
All 27 counties
Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Chickasaw County, IA, Clayton County, IA, Delaware County, IA, Fayette County, IA, Floyd County, IA, Grundy County, IA, Howard County, IA, Iowa County, IA, Johnson County, IA, Linn County, IA, Mitchell County, IA, Poweshiek County, IA, Tama County, IA, Winneshiek County, IA, Worth County, IA, Dodge County, MN, Fillmore County, MN, Freeborn County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Waseca County, MN
The radar
The La Crosse radar (KARX), 147 km from the middle of the area, began a volume at 06:29 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 nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 6.4 hours before the alert went out and 202 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
- 2585 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 699 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 12.8
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 |
|---|---|---|---|---|
| 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, 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 |
Nearby
Mesoscale Discussions in Iowa, 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.