Alert archive / Iowa / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 443
The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2004, 9:35 PM CDT for Henderson County, Mercer County, Illinois; 50 counties in Iowa; Grant County, Wisconsin. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2004, 9:35 PM CDT (02:35 UTC)
- Expired
- Jun 12, 2004, 2:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Appanoose County, IA, Benton County, IA, Black Hawk 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, 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, Hancock County, IA, Hardin County, IA, Henry 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, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Wright County, IA, Henderson County, IL, Mercer County, IL, Grant County, WI
The radar
The Des Moines radar (KDMX), 93 km from the middle of the area, began a volume at 02:38 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 10:11 PM CDT | Severe Thunderstorm Warning | DMX | Marshall, Story | 59 min |
| Jun 11, 11:33 PM CDT | Severe Thunderstorm Warning | DVN | Delaware, Linn | 57 min |
| Jun 11, 11:42 PM CDT | Severe Thunderstorm Warning | DVN | Jones | 63 min |
| Jun 12, 12:06 AM CDT | Severe Thunderstorm Warning | DVN | Dubuque | 54 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
Omaha, NE (KOAX), launched 00:00Z, 2.6 hours before the alert went out and 314 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
- 4 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 2604 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 11, 10:04 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Jo Daviess and 10 more | 56 min |
| Jun 11, 11:00 PM CDT | Tornado Watch | SPC | Bureau, Carroll, DeKalb, DuPage, Ford, Grundy and 15 more | 5 hr |
| Jun 12, 1:48 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 19 more | 87 min |
| Jun 12, 3:08 AM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Grundy, Iroquois, Kane and 7 more | 97 min |
| Jun 12, 10:48 AM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Massac, Pope | 2 hr |
| Jun 12, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | Henderson, Mercer, Rock Island, Warren | 5 hr |
| Jun 12, 3:51 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 11 more | 84 min |
| Jun 12, 4:15 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 5 hr |
| Jun 12, 6:08 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 37 min |
| Jun 11, 7:57 PM CDT | Mesoscale Discussion | SPC | Allamakee, Black Hawk, Bremer, Buchanan, Butler, Calhoun and 26 more | 93 min |
| Jun 12, 11:45 AM CDT | Tornado Watch | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 31 more | 7 hr |
| Jun 12, 12:43 PM CDT | Mesoscale Discussion | SPC | Audubon, Cass, Crawford, Fremont, Harrison, Mills and 4 more | 92 min |
| Jun 12, 5:00 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 29 more | 90 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2004Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Wisconsin, 2004Every severe thunderstorm watch in 2004
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.