Alert archive / Illinois / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 153
The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2004, 5:00 AM CDT for 16 counties in Illinois. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 7, 2004, 5:00 AM CDT (10:00 UTC)
- Expired
- May 7, 2004, 9:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Bureau County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Kendall 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, Will County, IL, Woodford County, IL
The radar
The Chicago radar (KLOT), 100 km from the middle of the area, began a volume at 10:03 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
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 5:04 AM CDT | Severe Thunderstorm Warning | ILX | Stark | 56 min |
| May 7, 5:15 AM CDT | Severe Thunderstorm Warning | ILX | Marshall, Peoria | 60 min |
| May 7, 5:22 AM CDT | Tornado Warning | ILX | Stark | 53 min |
| May 7, 5:36 AM CDT | Tornado Warning | ILX | Marshall | 39 min |
| May 7, 5:43 AM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 32 min |
| May 7, 5:53 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 7 min |
| May 7, 6:05 AM CDT | Severe Thunderstorm Warning | ILX | Woodford | 55 min |
| May 7, 6:12 AM CDT | Severe Thunderstorm Warning | LOT | Grundy | 48 min |
| May 7, 6:15 AM CDT | Severe Thunderstorm Warning | ILX | Marshall | 60 min |
| May 7, 6:17 AM CDT | Severe Thunderstorm Warning | LOT | Livingston | 43 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 00:00Z, 10.0 hours before the alert went out and 115 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
- 1869 J/kg
- Mixed-layer CIN
- -151 J/kg
- Mixed-layer LCL
- 1906 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 11:53 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, Henry, Jo Daviess, Knox and 10 more | 97 min |
| May 7, 4:24 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 22 more | 96 min |
| May 7, 6:38 AM CDT | Mesoscale Discussion | SPC | Bureau, Champaign, DeWitt, Ford, Grundy, Iroquois and 12 more | 97 min |
| May 7, 11:44 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, DeKalb, DuPage, Grundy, Henry and 9 more | 2 hr |
| May 7, 4:33 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 9 more | 87 min |
| May 7, 5:25 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, Cook, DeKalb, DuPage, Jo Daviess and 6 more | 6 hr |
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.