Alert archive / Iowa / Tornado Watches in 2004
Tornado Watch 566
The Storm Prediction Center issued this tornado watch at Jul 5, 2004, 4:20 PM CDT for 15 counties in Illinois; 57 counties in Iowa; Crawford County, Grant County, Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 5, 2004, 4:20 PM CDT (21:20 UTC)
- Expired
- Jul 5, 2004, 10:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 74 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, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque 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, Henry County, IA, Howard County, IA, Humboldt County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Kossuth County, IA, Lee County, IA, Linn County, IA, Louisa 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, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Webster County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Wright County, IA, Bureau County, IL, Carroll County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Marshall County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Warren County, IL, Whiteside County, IL, Woodford County, IL, Crawford County, WI, Grant County, WI
The radar
The Quad Cities radar (KDVN), 121 km from the middle of the area, began a volume at 21:21 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
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 4:38 PM CDT | Flash Flood Warning | DVN | Buchanan | 3 hr |
| Jul 5, 4:39 PM CDT | Flash Flood Warning | ARX | Fayette | 4 hr |
| Jul 5, 5:13 PM CDT | Tornado Warning | ARX | Fayette | 32 min |
| Jul 5, 5:52 PM CDT | Tornado Warning | ARX | Howard | 38 min |
| Jul 5, 6:33 PM CDT | Tornado Warning | ARX | Fayette | 27 min |
| Jul 5, 6:54 PM CDT | Flash Flood Warning | DMX | Cerro Gordo | 4 hr |
| Jul 5, 7:25 PM CDT | Flash Flood Warning | ARX | Floyd, Mitchell | 3 hr |
| Jul 5, 7:42 PM CDT | Severe Thunderstorm Warning | DVN | Cedar, Louisa, Muscatine | 48 min |
| Jul 5, 7:57 PM CDT | Flash Flood Warning | DVN | Buchanan | 6 hr |
| Jul 5, 8:14 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Mercer, Rock Island | 46 min |
| Jul 5, 8:24 PM CDT | Severe Thunderstorm Warning | ILX | Knox | 66 min |
| Jul 5, 8:55 PM CDT | Tornado Warning | DVN | Henry | 35 min |
| Jul 5, 9:07 PM CDT | Tornado Warning | DVN | Whiteside | 38 min |
| Jul 5, 9:29 PM CDT | Tornado Warning | ILX | Knox | 61 min |
| Jul 5, 9:40 PM CDT | Tornado Warning | DVN | Bureau, Henry | 50 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, 9.3 hours before the alert went out and 126 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
- 477 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 1211 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 052118
SEL6
SPC WW 052120
IAZ000-ILZ000-WIZ000-060300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 566
NWS STORM PREDICTION CENTER NORMAN OK
420 PM CDT MON JUL 5 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHERN AND EASTERN IOWA
NORTHWESTERN ILLINOIS
SOUTHWESTERN WISCONSIN
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 420 PM UNTIL 1000
PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 105 STATUTE MILES EAST AND
WEST OF A LINE FROM 35 MILES NORTHEAST OF MASON CITY IOWA TO 15
MILES SOUTHEAST OF BURLINGTON IOWA.
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 562...WW 563...WW 564...WW
565...
DISCUSSION...SHEAR AND INSTABILITY NOW FAVORABLE FOR SUPERCELLS
AHEAD OF SURFACE AND UPPER LOW MOVING SLOWLY NEWD ACROSS SWRN IA.
THUNDERSTORMS WILL CONTINUE TO INCREASE REMAINDER OF AFTERNOON THIS
AREA WITH INCREASING THREAT OF TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 22030.
...HALES
432,0904 403,0885 403,0925 432,0945SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 6:55 AM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Christian, Clinton, Coles, Cumberland and 12 more | 4 hr |
| Jul 5, 9:12 AM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clark, Clay, Clinton and 34 more | 63 min |
| Jul 5, 9:45 AM CDT | Severe Thunderstorm Watch | SPC | Clay, Edwards, Franklin, Gallatin, Hamilton, Jackson and 8 more | 4 hr |
| Jul 5, 12:08 PM CDT | Mesoscale Discussion | SPC | Edwards, Hardin, Lawrence, Richland, Wabash | 67 min |
| Jul 5, 3:00 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Hancock, Henderson, McDonough, Mercer and 3 more | 60 min |
| Jul 5, 3:43 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clinton, Jackson, Jersey, Madison and 5 more | 92 min |
| Jul 5, 4:00 PM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Cass, Fulton, Greene and 15 more | 6 hr |
| Jul 5, 6:30 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Henry, Jo Daviess, Mercer, Rock Island and 1 more | 60 min |
| Jul 4, 11:05 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills | 5 hr |
| Jul 5, 1:16 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 25 more | 89 min |
| Jul 5, 2:00 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 31 more | 5 hr |
| Jul 5, 4:45 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 30 more | 2 hr |
Nearby
Tornado Watches in Iowa, 2004Tornado Watches in Illinois, 2004Tornado Watches in Wisconsin, 2004Every tornado 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.