Alert archive / Iowa / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 875
The Storm Prediction Center issued this severe thunderstorm watch at Aug 20, 2003, 2:50 PM CDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 20, 2003, 2:50 PM CDT (19:50 UTC)
- Expired
- Aug 20, 2003, 8:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 91 counties
Allamakee County, IA, Appanoose County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy 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, Mahaska County, IA, Marion County, IA, Marshall County, IA, Mitchell County, IA, Monroe County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Wayne County, IA, Winneshiek County, IA, Carroll County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Dodge County, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Clark County, MO, Mercer County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Richland County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI
The radar
The Quad Cities radar (KDVN), 113 km from the middle of the area, began a volume at 19:49 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.
Warnings issued inside it
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 3:06 PM CDT | Severe Thunderstorm Warning | DMX | Lucas | 39 min |
| Aug 20, 3:09 PM CDT | Severe Thunderstorm Warning | DMX | Marion | 51 min |
| Aug 20, 3:23 PM CDT | Severe Thunderstorm Warning | DMX | Wayne | 52 min |
| Aug 20, 3:40 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska | 50 min |
| Aug 20, 3:51 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 39 min |
| Aug 20, 4:18 PM CDT | Severe Thunderstorm Warning | DVN | Iowa, Keokuk | 57 min |
| Aug 20, 4:59 PM CDT | Severe Thunderstorm Warning | DVN | Johnson, Linn | 61 min |
| Aug 20, 5:01 PM CDT | Severe Thunderstorm Warning | DVN | Benton | 44 min |
| Aug 20, 5:42 PM CDT | Severe Thunderstorm Warning | DVN | Cedar | 48 min |
| Aug 20, 5:48 PM CDT | Severe Thunderstorm Warning | DVN | Jones | 42 min |
| Aug 20, 5:55 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Muscatine, Scott | 50 min |
| Aug 20, 6:02 PM CDT | Severe Thunderstorm Warning | DVN | Dubuque, Jackson | 58 min |
| Aug 20, 6:21 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 39 min |
| Aug 20, 6:39 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 51 min |
| Aug 20, 7:01 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island | 59 min |
| Aug 20, 7:13 PM CDT | Severe Thunderstorm Warning | MKX | Iowa | 47 min |
| Aug 20, 7:17 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 58 min |
| Aug 20, 7:23 PM CDT | Severe Thunderstorm Warning | DVN | Whiteside | 52 min |
| Aug 20, 7:28 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 32 min |
| Aug 20, 7:34 PM CDT | Severe Thunderstorm Warning | ARX | Richland | 56 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 12:00Z, 7.8 hours before the alert went out and 119 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
- 641 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 1398 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 2:15 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock, Henderson, Mercer | 90 min |
| Aug 20, 5:27 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Monroe, Pike | 2 hr |
| Aug 20, 6:09 PM CDT | Mesoscale Discussion | SPC | Carroll, Fulton, Hancock, Henderson, Henry, Jo Daviess and 8 more | 2 hr |
| Aug 20, 2:11 PM CDT | Mesoscale Discussion | SPC | Chisago, Goodhue, Houston, Pine, Wabasha, Washington and 1 more | 2 hr |
| Aug 20, 3:45 PM CDT | Tornado Watch | SPC | Aitkin, Carlton, Chisago, Itasca, Kanabec, Lake and 2 more | 5 hr |
| Aug 20, 3:26 PM CDT | Mesoscale Discussion | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 19 more | 94 min |
| Aug 20, 4:10 PM CDT | Severe Thunderstorm Watch | SPC | Andrew, Buchanan, Caldwell, Carroll, Cass, Chariton and 15 more | 5 hr |
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.