Alert archive / Iowa / Mesoscale Discussions in 2007
Mesoscale Discussion 1518
The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2007, 12:47 PM CDT for 43 counties in Iowa; 16 counties in Minnesota; Lincoln County, Minnehaha County, South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2007, 12:47 PM CDT (17:47 UTC)
- Expired
- Jul 18, 2007, 3:15 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 61 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Clayton County, IA, Delaware County, IA, Dickinson County, IA, Emmet County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Kossuth County, IA, Linn County, IA, Lyon County, IA, Marshall County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Blue Earth County, MN, Cottonwood County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Jackson County, MN, Martin County, MN, Mower County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Rock County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN, Lincoln County, SD, Minnehaha County, SD
The radar
The Minneapolis radar (KMPX), 179 km from the middle of the area, began a volume at 17:49 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
Minneapolis, MN (KMPX), launched 12:00Z, 5.8 hours before the alert went out and 178 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
- 1891 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 641 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- -0.2
- Supercell composite
- -1.6
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 17, 9:31 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Cedar and 13 more | 6 hr |
| Jul 17, 11:24 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Buena Vista and 46 more | 96 min |
| Jul 18, 3:35 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 20 more | 85 min |
| Jul 18, 2:09 PM CDT | Severe Thunderstorm Watch | SPC | Black Hawk, Boone, Bremer, Buena Vista, Butler, Calhoun and 33 more | 4 hr |
| Jul 18, 4:59 PM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Buchanan, Cedar, Clayton, Clinton and 17 more | 91 min |
| Jul 18, 5:35 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Black Hawk, Boone, Bremer, Buchanan, Butler and 41 more | 6 hr |
| Jul 18, 6:50 PM CDT | Mesoscale Discussion | SPC | Benton, Black Hawk, Buchanan, Cedar, Clarke, Clayton and 29 more | 85 min |
| Jul 18, 12:17 PM CDT | Mesoscale Discussion | SPC | Anoka, Chisago, Isanti, Ramsey, Washington | 118 min |
| Jul 18, 3:42 PM CDT | Mesoscale Discussion | SPC | Anoka, Dakota, Goodhue, Hennepin, Olmsted, Ramsey and 4 more | 63 min |
| Jul 18, 3:59 PM CDT | Severe Thunderstorm Watch | SPC | Anoka, Carver, Dakota, Dodge, Fillmore, Goodhue and 14 more | 5 hr |
| Jul 18, 6:44 PM CDT | Mesoscale Discussion | SPC | Houston, Winona | 2 hr |
| Jul 18, 1:51 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Custer, Fall River, Gregory, Haakon and 10 more | 54 min |
| Jul 18, 2:53 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Butte, Custer, Fall River, Haakon, Hughes and 11 more | 7 hr |
| Jul 18, 4:15 PM CDT | Mesoscale Discussion | SPC | Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 10 more | 3 hr |
Nearby
Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Minnesota, 2007Mesoscale Discussions in South Dakota, 2007Every mesoscale discussion in 2007
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.