Alert archive / Illinois / Tornado Watches in 2008
Tornado Watch 479
The Storm Prediction Center issued this tornado watch at Jun 7, 2008, 2:01 PM CDT for 32 counties in Illinois; 9 counties in Iowa. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 7, 2008, 2:01 PM CDT (19:01 UTC)
- Expired
- Jun 7, 2008, 7:46 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 41 counties
Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL
The radar
The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 19:02 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 2:25 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 47 min |
| Jun 7, 2:28 PM CDT | Flash Flood Warning | DVN | Mercer, Rock Island | 93 min |
| Jun 7, 2:52 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Jo Daviess, Stephenson, Whiteside | 53 min |
| Jun 7, 3:10 PM CDT | Severe Thunderstorm Warning | LOT | Lee, Ogle | 65 min |
| Jun 7, 3:25 PM CDT | Severe Thunderstorm Warning | DVN | Jo Daviess, Stephenson | 50 min |
| Jun 7, 3:35 PM CDT | Tornado Warning | ILX | Marshall | 25 min |
| Jun 7, 3:38 PM CDT | Tornado Warning | LOT | LaSalle, Livingston | 41 min |
| Jun 7, 3:48 PM CDT | Tornado Warning | LOT | LaSalle, Livingston | 57 min |
| Jun 7, 3:57 PM CDT | Severe Thunderstorm Warning | LOT | Winnebago | 31 min |
| Jun 7, 4:28 PM CDT | Tornado Warning | LOT | Grundy, Livingston | 47 min |
| Jun 7, 5:07 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 32 min |
| Jun 7, 5:21 PM CDT | Tornado Warning | LOT | Cook, Will | 54 min |
| Jun 7, 5:45 PM CDT | Tornado Warning | LOT | Kankakee, Will | 60 min |
| Jun 7, 6:08 PM CDT | Tornado Warning | LOT | Cook, Will | 67 min |
| Jun 7, 6:32 PM CDT | Tornado Warning | LOT | Cook | 50 min |
| Jun 7, 6:36 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 24 min |
| Jun 7, 7:27 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 33 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
Davenport, (KDVN), launched 12:00Z, 7.0 hours before the alert went out and 58 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
- 2173 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 584 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 173 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 10.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 2:31 AM CDT | Mesoscale Discussion | SPC | Clark, Coles, Crawford, Cumberland, Douglas, Edgar and 4 more | 119 min |
| Jun 7, 10:35 AM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Rock Island, Stephenson, Whiteside | 85 min |
| Jun 7, 1:50 PM CDT | Mesoscale Discussion | SPC | Carroll, Henderson, Henry, Jo Daviess, Mercer, Ogle and 5 more | 55 min |
| Jun 7, 6:34 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Jo Daviess, Kane and 5 more | 56 min |
| Jun 7, 12:10 PM CDT | Mesoscale Discussion | SPC | Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 16 more | 95 min |
| Jun 7, 12:17 PM CDT | Tornado Watch | SPC | Allamakee, Audubon, Benton, Black Hawk, Boone, Bremer and 37 more | 8 hr |
| Jun 7, 3:29 PM CDT | Mesoscale Discussion | SPC | Adams, Audubon, Cass, Fremont, Harrison, Mills and 4 more | 3 hr |
| Jun 7, 4:25 PM CDT | Tornado Watch | SPC | Buena Vista, Cherokee, Clay, Fremont, Harrison, Ida and 7 more | 7 hr |
| Jun 7, 1:35 PM CDT | Mesoscale Discussion | SPC | Calumet, Columbia, Dane, Dodge, Fond du Lac, Grant and 16 more | 85 min |
Nearby
Tornado Watches in Illinois, 2008Tornado Watches in Iowa, 2008Every tornado watch in 2008
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.