Alert archive / Iowa / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 617
The Storm Prediction Center issued this severe thunderstorm watch at Jul 13, 2004, 12:55 AM CDT for 58 counties in Iowa. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2004, 12:55 AM CDT (05:55 UTC)
- Expired
- Jul 13, 2004, 7:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 58 counties
Adair County, IA, Audubon County, IA, Benton County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buchanan County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Humboldt County, IA, Ida County, IA, Iowa County, IA, Jasper County, IA, Johnson County, IA, Keokuk County, IA, Kossuth County, IA, Linn County, IA, Lyon County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Muscatine County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Polk County, IA, Poweshiek County, IA, Sac County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Warren County, IA, Washington County, IA, Webster County, IA, Winnebago County, IA, Worth County, IA, Wright County, IA
The radar
The Des Moines radar (KDMX), 105 km from the middle of the area, began a volume at 05:55 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
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 12:58 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 62 min |
| Jul 13, 1:04 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 41 min |
| Jul 13, 1:05 AM CDT | Severe Thunderstorm Warning | FSD | Osceola | 25 min |
| Jul 13, 1:13 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 62 min |
| Jul 13, 1:17 AM CDT | Flash Flood Warning | FSD | O'Brien | 88 min |
| Jul 13, 1:45 AM CDT | Severe Thunderstorm Warning | FSD | Sioux | 30 min |
| Jul 13, 1:51 AM CDT | Severe Thunderstorm Warning | FSD | Cherokee | 39 min |
| Jul 13, 1:58 AM CDT | Severe Thunderstorm Warning | FSD | Buena Vista, Clay | 47 min |
| Jul 13, 2:31 AM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 44 min |
| Jul 13, 2:33 AM CDT | Severe Thunderstorm Warning | DMX | Kossuth | 42 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
Minneapolis, MN (KMPX), launched 00:00Z, 5.9 hours before the alert went out and 244 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
- 1267 J/kg
- Mixed-layer CIN
- -73 J/kg
- Mixed-layer LCL
- 1215 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 174 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 9:15 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 32 more | 7 hr |
| Jul 12, 9:19 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, Hancock, Kossuth, Lyon and 5 more | 116 min |
| Jul 12, 11:19 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Cass, Decatur, Fremont, Mills and 6 more | 116 min |
| Jul 12, 11:52 PM CDT | Mesoscale Discussion | SPC | Cherokee, Dickinson, Lyon, O'Brien, Osceola, Plymouth and 1 more | 53 min |
| Jul 13, 4:21 AM CDT | Mesoscale Discussion | SPC | Allamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 22 more | 54 min |
| Jul 13, 10:32 AM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Delaware, Dubuque, Jackson, Johnson and 4 more | 118 min |
| Jul 13, 10:55 AM CDT | Tornado Watch | SPC | Cedar, Clinton, Delaware, Dubuque, Jackson, Jones and 3 more | 6 hr |
| Jul 13, 1:39 PM CDT | Mesoscale Discussion | SPC | Cedar, Clinton, Delaware, Dubuque, Jackson, Jones and 3 more | 66 min |
| Jul 13, 2:25 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Harrison, Mills, Monona, Pottawattamie, Shelby | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 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.