Alert archive / Illinois / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 758
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2003, 9:55 AM CDT for 21 counties in Illinois; 12 counties in Kentucky; 20 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2003, 9:55 AM CDT (14:55 UTC)
- Expired
- Jul 18, 2003, 3:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Alexander County, IL, Clinton County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Ballard County, KY, Calloway County, KY, Carlisle County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Trigg County, KY, Bollinger County, MO, Butler County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO, Warren County, MO, Washington County, MO, Wayne County, MO
The radar
The Paducah radar (KPAH), 105 km from the middle of the area, began a volume at 14:58 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 10:02 AM CDT | Severe Thunderstorm Warning | LSX | Clinton, Washington | 43 min |
| Jul 18, 10:23 AM CDT | Severe Thunderstorm Warning | PAH | Perry | 52 min |
| Jul 18, 10:58 AM CDT | Severe Thunderstorm Warning | PAH | Jackson | 62 min |
| Jul 18, 11:16 AM CDT | Severe Thunderstorm Warning | PAH | Union | 44 min |
| Jul 18, 11:31 AM CDT | Severe Thunderstorm Warning | PAH | Cape Girardeau | 44 min |
| Jul 18, 11:48 AM CDT | Severe Thunderstorm Warning | PAH | Alexander, Johnson, Pulaski | 27 min |
| Jul 18, 11:59 AM CDT | Severe Thunderstorm Warning | PAH | Union | 16 min |
| Jul 18, 12:15 PM CDT | Severe Thunderstorm Warning | PAH | Alexander, Massac, Pulaski | 60 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
Lincoln, IL (KILX), launched 12:00Z, 2.9 hours before the alert went out and 263 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
- 315 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 874 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 183 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 9:40 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Champaign, DeWitt, Ford, Grundy, Henry and 13 more | 5 hr |
| Jul 17, 11:41 PM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, Ford, Grundy, Henry, Iroquois and 12 more | 94 min |
| Jul 18, 2:01 AM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Coles, Cumberland, DeWitt, Douglas and 13 more | 59 min |
| Jul 18, 2:26 AM CDT | Mesoscale Discussion | SPC | Henderson, Knox, Mercer, Rock Island, Warren | 3 hr |
| Jul 18, 4:30 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Cass, Christian and 38 more | 6 hr |
| Jul 18, 6:15 AM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Clinton and 18 more | 60 min |
| Jul 18, 6:50 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Franklin, Jackson, Johnson, Monroe, Perry and 6 more | 5 hr |
| Jul 18, 9:06 AM CDT | Mesoscale Discussion | SPC | Alexander, Bond, Calhoun, Clinton, Franklin, Greene and 16 more | 84 min |
| Jul 18, 3:23 PM CDT | Mesoscale Discussion | SPC | Adams, Calhoun, Jersey, Monroe, Pike, Randolph | 97 min |
| Jul 18, 3:45 PM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Greene, Jersey, Monroe | 5 hr |
| Jul 18, 12:45 PM CDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 3 more | 60 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Missouri, 2003Severe Thunderstorm Watches in Kentucky, 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.