Alert archive / Illinois / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 606
The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2004, 5:40 PM CDT for 22 counties in Illinois. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 11, 2004, 5:40 PM CDT (22:40 UTC)
- Expired
- Jul 11, 2004, 11:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 22 counties
Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Iroquois County, IL, Logan County, IL, Macon County, IL, McLean County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Sangamon County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL
The radar
The Lincoln radar (KILX), 39 km from the middle of the area, began a volume at 22:43 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
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 5:58 PM CDT | Severe Thunderstorm Warning | ILX | Macon | 47 min |
| Jul 11, 6:00 PM CDT | Severe Thunderstorm Warning | ILX | Macon | 45 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, 10.7 hours before the alert went out and 29 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
- 578 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 729 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 10:14 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, DuPage, Ford, Fulton and 24 more | 91 min |
| Jul 11, 11:40 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Cass, Champaign, Cook, DeKalb and 40 more | 6 hr |
| Jul 11, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Greene, Jersey, Macoupin, Morgan, Pike and 1 more | 5 hr |
| Jul 11, 5:19 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Champaign, Christian, Clinton, Coles and 18 more | 116 min |
Nearby
Severe Thunderstorm Watches in Illinois, 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.