Alert archive / Illinois / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 215
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 2004, 12:00 PM CDT for 54 counties in Illinois; Vermillion County, Indiana; 13 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 2004, 12:00 PM CDT (17:00 UTC)
- Expired
- May 18, 2004, 7:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 68 counties
Adams County, IL, 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, Ford County, IL, Fulton County, IL, Greene County, IL, Hancock County, IL, Iroquois County, IL, Jasper County, IL, Jersey County, IL, Kankakee County, IL, Lawrence County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Pike County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Washington County, IL, Woodford County, IL, Vermillion County, IN, City of Saint Louis, MO, Crawford County, MO, Franklin County, MO, Gasconade County, MO, Jefferson County, MO, Lincoln County, MO, Marion County, MO, Montgomery County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO
The radar
The Lincoln radar (KILX), 72 km from the middle of the area, began a volume at 17:02 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
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 12:27 PM CDT | Severe Thunderstorm Warning | ILX | Morgan | 63 min |
| May 18, 1:07 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 38 min |
| May 18, 1:22 PM CDT | Severe Thunderstorm Warning | LSX | Pike | 23 min |
| May 18, 1:43 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Piatt | 62 min |
| May 18, 1:58 PM CDT | Flash Flood Warning | ILX | DeWitt | 6 hr |
| May 18, 1:59 PM CDT | Severe Thunderstorm Warning | IND | Parke, Vermillion | 61 min |
| May 18, 2:05 PM CDT | Severe Thunderstorm Warning | LSX | Lincoln, Pike | 25 min |
| May 18, 3:41 PM CDT | Severe Thunderstorm Warning | ILX | McLean | 49 min |
| May 18, 3:42 PM CDT | Severe Thunderstorm Warning | LSX | Macoupin | 33 min |
| May 18, 3:43 PM CDT | Severe Thunderstorm Warning | ILX | McLean | 47 min |
| May 18, 4:02 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 43 min |
| May 18, 4:22 PM CDT | Severe Thunderstorm Warning | LSX | Montgomery | 38 min |
| May 18, 4:43 PM CDT | Severe Thunderstorm Warning | ILX | Peoria, Tazewell, Woodford | 62 min |
| May 18, 4:45 PM CDT | Flash Flood Warning | ILX | Peoria | 4 hr |
| May 18, 4:53 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Shelby | 52 min |
| May 18, 5:04 PM CDT | Flash Flood Warning | IND | Fountain, Parke, Vermillion | 116 min |
| May 18, 5:08 PM CDT | Tornado Warning | ILX | Tazewell, Woodford | 52 min |
| May 18, 5:35 PM CDT | Tornado Warning | ILX | Tazewell, Woodford | 25 min |
| May 18, 5:40 PM CDT | Severe Thunderstorm Warning | ILX | McLean | 65 min |
| May 18, 6:11 PM CDT | Tornado Warning | ILX | McLean | 64 min |
| May 18, 6:24 PM CDT | Flash Flood Warning | ILX | McLean | 3 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, 5.0 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
- 989 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 838 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 85 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 |
|---|---|---|---|---|
| May 17, 7:15 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, DeKalb, Jo Daviess, Lee, McHenry and 6 more | 5 hr |
| May 17, 11:37 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Grundy, Kane and 8 more | 23 min |
| May 18, 12:41 AM CDT | Mesoscale Discussion | SPC | Grundy, Kankakee, Will | 2 hr |
| May 18, 10:26 AM CDT | Mesoscale Discussion | SPC | Bond, Brown, Bureau, Calhoun, Cass, Champaign and 38 more | 3 hr |
| May 18, 2:38 PM CDT | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 23 more | 2 hr |
| May 18, 6:09 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 27 more | 96 min |
| May 18, 11:55 AM CDT | Mesoscale Discussion | SPC | Adams, Allen, Benton, Blackford, Boone, Carroll and 34 more | 2 hr |
| May 18, 12:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Bartholomew, Benton, Blackford, Boone and 49 more | 6 hr |
| May 18, 3:02 PM CDT | Mesoscale Discussion | SPC | Adams, Blackford, Boone, Carroll, Cass, Clinton and 15 more | 118 min |
| May 17, 8:20 PM CDT | Mesoscale Discussion | SPC | Andrew, Atchison, Daviess, DeKalb, Gentry, Grundy and 7 more | 55 min |
| May 18, 6:22 AM CDT | Mesoscale Discussion | SPC | Buchanan, Caldwell, Cass, Clay, Clinton, DeKalb and 3 more | 113 min |
| May 18, 6:27 PM CDT | Mesoscale Discussion | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Clay and 9 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2004Severe Thunderstorm Watches in Missouri, 2004Severe Thunderstorm Watches in Indiana, 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.