Alert archive / Illinois / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 237
The Storm Prediction Center issued this severe thunderstorm watch at Apr 25, 2008, 7:13 PM CDT for 28 counties in Illinois; 5 counties in Indiana; Sainte Genevieve County, Saint Francois County, Missouri. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2008, 7:13 PM CDT (00:13 UTC)
- Expired
- Apr 25, 2008, 10:00 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 35 counties
Bond County, IL, Champaign County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cook 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, Kankakee County, IL, Macon County, IL, Marion County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Piatt County, IL, Randolph County, IL, Saint Clair County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, Will County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Saint Francois County, MO, Sainte Genevieve County, MO
The radar
The Lincoln radar (KILX), 50 km from the middle of the area, began a volume at 00:15 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
- 10%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 50%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:14 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Logan, Macon, Sangamon | 27 min |
| Apr 25, 7:15 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Clinton, Madison, Montgomery, Saint Clair | 45 min |
| Apr 25, 7:34 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Shelby | 41 min |
| Apr 25, 8:53 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Vermilion | 37 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 0.2 hours before the alert went out and 18 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
- 151 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1483 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 214 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 5.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 10:06 PM CDT | Mesoscale Discussion | SPC | Dunklin, Pemiscot | 54 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2008Severe Thunderstorm Watches in Indiana, 2008Severe Thunderstorm Watches in Missouri, 2008Every severe thunderstorm 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.