Alert archive / Illinois / Tornado Watches in 2004
Tornado Watch 783
The Storm Prediction Center issued this tornado watch at Aug 25, 2004, 2:20 PM CDT for 40 counties in Illinois; Saint Charles County, Saint Louis County, City of Saint Louis, Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2004, 2:20 PM CDT (19:20 UTC)
- Expired
- Aug 25, 2004, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 43 counties
Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Fulton County, IL, Greene County, IL, Jasper County, IL, Jersey County, IL, Lawrence County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Richland County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, City of Saint Louis, MO, Saint Charles County, MO, Saint Louis County, MO
The radar
The Lincoln radar (KILX), 51 km from the middle of the area, began a volume at 19:24 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 |
|---|---|---|---|---|
| Aug 25, 2:49 PM CDT | Flash Flood Warning | ILX | Schuyler | 6 hr |
| Aug 25, 3:07 PM CDT | Flash Flood Warning | ILX | Cass, Morgan, Scott | 6 hr |
| Aug 25, 3:42 PM CDT | Flash Flood Warning | ILX | Mason | 6 hr |
| Aug 25, 4:07 PM CDT | Severe Thunderstorm Warning | ILX | Mason | 38 min |
| Aug 25, 4:30 PM CDT | Flash Flood Warning | ILX | Menard | 6 hr |
| Aug 25, 5:23 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Jersey | 22 min |
| Aug 25, 5:27 PM CDT | Severe Thunderstorm Warning | LSX | Greene | 33 min |
| Aug 25, 5:31 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 44 min |
| Aug 25, 5:37 PM CDT | Flash Flood Warning | ILX | Logan, Sangamon | 6 hr |
| Aug 25, 5:51 PM CDT | Severe Thunderstorm Warning | LSX | Jersey, Macoupin, Madison, Saint Clair | 39 min |
| Aug 25, 5:52 PM CDT | Flash Flood Warning | ILX | DeWitt, McLean, Macon | 6 hr |
| Aug 25, 5:55 PM CDT | Severe Thunderstorm Warning | ILX | Morgan, Sangamon | 65 min |
| Aug 25, 6:40 PM CDT | Flash Flood Warning | ILX | Christian | 6 hr |
| Aug 25, 7:10 PM CDT | Flash Flood Warning | ILX | Piatt | 6 hr |
| Aug 25, 7:34 PM CDT | Flash Flood Warning | ILX | Champaign | 5 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 7.3 hours before the alert went out and 92 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
- 1166 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 777 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 201 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 251920
SEL3
SPC WW 251920
ILZ000-MOZ000-260100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 783
NWS STORM PREDICTION CENTER NORMAN OK
220 PM CDT WED AUG 25 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
CENTRAL ILLINOIS
EAST CENTRAL MISSOURI
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 220 PM UNTIL
800 PM CDT.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 60 MILES NORTH NORTHWEST OF SAINT LOUIS
MISSOURI TO 35 MILES EAST OF MATTOON ILLINOIS.
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 782...
DISCUSSION...E/W BOUNDARY ACROSS CENTRAL IL WILL BE FOCUS FOR
INTENSE THUNDERSTORM DEVELOPMENT. WITH EXTREMELY UNSTABLE AIR MASS
AND APPROACH OF S/WV TROUGH AND ATTENDANT STRONG DEEP LAYER
SHEAR...SUPERCELLS ARE LIKELY WITH TORNADO POTENTIAL.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 25025.
...HALES
402,0904 402,0873 383,0873 383,0904SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 9:24 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, DeWitt, Fulton and 22 more | 2 hr |
| Aug 25, 11:59 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Hancock, Pike and 2 more | 91 min |
| Aug 25, 12:35 PM CDT | Tornado Watch | SPC | Adams, Brown, Hancock, Henderson, Mercer, Pike | 6 hr |
| Aug 25, 1:22 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cass, Champaign, DeKalb and 42 more | 113 min |
| Aug 25, 3:15 PM CDT | Severe Thunderstorm Watch | SPC | Monroe, Saint Clair | 6 hr |
| Aug 25, 5:14 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 34 more | 91 min |
| Aug 24, 8:20 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 26 more | 7 hr |
| Aug 24, 11:47 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Buchanan, Caldwell, Carroll, Chariton and 22 more | 118 min |
| Aug 25, 2:14 AM CDT | Mesoscale Discussion | SPC | Adair, Andrew, Buchanan, Caldwell, Chariton, Clinton and 14 more | 31 min |
| Aug 25, 8:50 AM CDT | Severe Thunderstorm Watch | SPC | Andrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 6 more | 5 hr |
| Aug 25, 4:50 PM CDT | Mesoscale Discussion | SPC | Bates, Cass, Clay, Jackson, Platte, Vernon | 85 min |
| Aug 25, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Bates, Cass, Clay, Jackson, Platte | 5 hr |
Nearby
Tornado Watches in Illinois, 2004Tornado Watches in Missouri, 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.