Alert archive / Iowa / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 641
The Storm Prediction Center issued this severe thunderstorm watch at Jul 4, 2003, 11:25 PM CDT for 12 counties in Illinois; 62 counties in Iowa; 13 counties in Wisconsin. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 4, 2003, 11:25 PM CDT (04:25 UTC)
- Expired
- Jul 5, 2003, 6:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 87 counties
Adair County, IA, Adams County, IA, Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clarke County, IA, Clayton County, IA, Clinton County, IA, Dallas County, IA, Davis County, IA, Decatur County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hardin County, IA, Henry County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Ringgold County, IA, Scott County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Winneshiek County, IA, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Mercer County, IL, Ogle County, IL, Rock Island County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jefferson County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Washington County, WI
The radar
The Des Moines radar (KDMX), 113 km from the middle of the area, began a volume at 04:25 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.
Warnings issued inside it
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 12:21 AM CDT | Severe Thunderstorm Warning | DMX | Hardin | 39 min |
| Jul 5, 12:23 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Story | 52 min |
| Jul 5, 12:37 AM CDT | Severe Thunderstorm Warning | DMX | Grundy | 53 min |
| Jul 5, 12:58 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Tama | 57 min |
| Jul 5, 1:10 AM CDT | Severe Thunderstorm Warning | DVN | Benton, Buchanan, Iowa | 50 min |
| Jul 5, 1:12 AM CDT | Severe Thunderstorm Warning | DMX | Bremer | 48 min |
| Jul 5, 1:44 AM CDT | Severe Thunderstorm Warning | DVN | Delaware, Johnson, Linn | 56 min |
| Jul 5, 2:01 AM CDT | Severe Thunderstorm Warning | ARX | Clayton | 59 min |
| Jul 5, 2:18 AM CDT | Severe Thunderstorm Warning | DVN | Cedar, Dubuque, Jones | 57 min |
| Jul 5, 2:49 AM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 56 min |
| Jul 5, 3:11 AM CDT | Severe Thunderstorm Warning | MKX | Green | 49 min |
| Jul 5, 3:17 AM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 43 min |
| Jul 5, 3:47 AM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle, Winnebago | 58 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 4.4 hours before the alert went out and 156 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
- 135 J/kg
- Mixed-layer CIN
- -351 J/kg
- Mixed-layer LCL
- 2353 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 8:58 PM CDT | Mesoscale Discussion | SPC | DuPage, Grundy, Iroquois, Kane, Kankakee, Kendall and 1 more | 62 min |
| Jul 4, 10:09 PM CDT | Mesoscale Discussion | SPC | Brown, Cass, Champaign, DeWitt, Douglas, Ford and 20 more | 2 hr |
| Jul 4, 10:45 PM CDT | Mesoscale Discussion | SPC | Jo Daviess, Rock Island | 90 min |
| Jul 5, 2:31 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 27 more | 89 min |
| Jul 5, 3:40 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more | 4 hr |
| Jul 5, 5:43 AM CDT | Mesoscale Discussion | SPC | Cook, Kankakee, Lake, Will | 92 min |
| Jul 5, 12:55 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Coles, Crawford, Cumberland and 14 more | 3 hr |
| Jul 5, 4:34 PM CDT | Mesoscale Discussion | SPC | Champaign, Ford, Iroquois, Vermilion | 56 min |
| Jul 5, 5:18 PM CDT | Mesoscale Discussion | SPC | Cass, DeWitt, Fulton, Hancock, Henderson, Henry and 16 more | 57 min |
| Jul 5, 5:55 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 36 more | 6 hr |
| Jul 4, 8:43 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 20 more | 62 min |
| Jul 4, 9:05 PM CDT | Tornado Watch | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cass, Cherokee and 31 more | 6 hr |
| Jul 5, 12:19 PM CDT | Mesoscale Discussion | SPC | Harrison, Monona | 2 hr |
| Jul 5, 3:10 PM CDT | Severe Thunderstorm Watch | SPC | Harrison, Mills, Monona, Plymouth, Pottawattamie, Woodbury | 7 hr |
| Jul 5, 6:42 PM CDT | Mesoscale Discussion | SPC | Fremont, Harrison, Mills, Monona, Page, Pottawattamie and 1 more | 93 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2003Severe Thunderstorm Watches in Wisconsin, 2003Severe Thunderstorm Watches in Illinois, 2003Every severe thunderstorm watch in 2003
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.