Alert archive / Illinois / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 755
The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2003, 9:40 PM CDT for 19 counties in Illinois; 10 counties in Indiana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2003, 9:40 PM CDT (02:40 UTC)
- Expired
- Jul 18, 2003, 3:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Bureau County, IL, Champaign County, IL, DeWitt County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, McLean County, IL, Peoria County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN
The radar
The Lincoln radar (KILX), 97 km from the middle of the area, began a volume at 02:43 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 10:03 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Kankakee | 42 min |
| Jul 17, 10:31 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 59 min |
| Jul 17, 10:41 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 49 min |
| Jul 17, 10:42 PM CDT | Severe Thunderstorm Warning | ILX | Vermilion | 63 min |
| Jul 17, 10:56 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 64 min |
| Jul 17, 11:08 PM CDT | Severe Thunderstorm Warning | IND | Warren | 37 min |
| Jul 17, 11:40 PM CDT | Severe Thunderstorm Warning | IND | Fountain | 35 min |
| Jul 17, 11:48 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Vermilion | 57 min |
| Jul 18, 1:21 AM CDT | Severe Thunderstorm Warning | LOT | Ford | 24 min |
| Jul 18, 1:25 AM CDT | Severe Thunderstorm Warning | ILX | McLean | 35 min |
| Jul 18, 2:01 AM CDT | Severe Thunderstorm Warning | ILX | Champaign | 44 min |
| Jul 18, 2:56 AM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 49 min |
| Jul 18, 2:59 AM CDT | Flash Flood Warning | ILX | Champaign | 6 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 00:00Z, 2.7 hours before the alert went out and 96 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
- 2256 J/kg
- Mixed-layer CIN
- -134 J/kg
- Mixed-layer LCL
- 1630 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 4.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 9:55 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Clinton, Franklin, Gallatin, Hamilton, Hardin and 15 more | 5 hr |
| 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 |
Nearby
Severe Thunderstorm Watches in Illinois, 2003Severe Thunderstorm Watches in Indiana, 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.