Alert archive / Illinois / Severe Thunderstorm Watches in 2003
Severe Thunderstorm Watch 658
The Storm Prediction Center issued this severe thunderstorm watch at Jul 6, 2003, 6:00 PM CDT for 15 counties in Illinois; 6 counties in Indiana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2003, 6:00 PM CDT (23:00 UTC)
- Expired
- Jul 6, 2003, 11:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Boone County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, McHenry County, IL, Will County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Warren County, IN
The radar
The Chicago radar (KLOT), 16 km from the middle of the area, began a volume at 23:02 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
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:24 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 51 min |
| Jul 6, 7:11 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 49 min |
| Jul 6, 8:02 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 28 min |
| Jul 6, 8:05 PM CDT | Severe Thunderstorm Warning | IND | Warren | 25 min |
| Jul 6, 8:36 PM CDT | Severe Thunderstorm Warning | IND | Fountain, Warren | 39 min |
| Jul 6, 9:14 PM CDT | Severe Thunderstorm Warning | IND | Fountain, Warren | 46 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, 11.0 hours before the alert went out and 168 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
- 1041 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 1114 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 7:20 PM CDT | Mesoscale Discussion | SPC | Edgar, Iroquois, Vermilion | 55 min |
| Jul 5, 7:51 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 40 more | 54 min |
| Jul 5, 10:46 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 33 more | 59 min |
| Jul 6, 5:17 AM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson, Whiteside | 118 min |
| Jul 6, 7:45 AM CDT | Mesoscale Discussion | SPC | Boone, DeKalb, DuPage, Kane, Lake, McHenry | 2 hr |
| Jul 6, 9:48 AM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 34 more | 117 min |
| Jul 6, 11:45 AM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 6 hr |
| Jul 6, 12:36 PM CDT | Mesoscale Discussion | SPC | Cook, Kankakee | 114 min |
| Jul 6, 1:10 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 14 more | 5 hr |
| Jul 6, 2:00 PM CDT | Mesoscale Discussion | SPC | Boone, Brown, Cass, Champaign, Christian, Coles and 35 more | 2 hr |
| Jul 6, 5:28 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Champaign, Christian, Coles and 45 more | 62 min |
| Jul 6, 1:25 PM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 4 more | 5 hr |
| Jul 6, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Clinton and 26 more | 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.