Alert archive / Illinois / Severe Thunderstorm Watches in 2008
Severe Thunderstorm Watch 608
The Storm Prediction Center issued this severe thunderstorm watch at Jun 25, 2008, 11:53 PM CDT for 18 counties in Illinois; 16 counties in Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2008, 11:53 PM CDT (04:53 UTC)
- Expired
- Jun 26, 2008, 4:48 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 34 counties
Adams County, IL, Brown County, IL, Cass County, IL, Fulton County, IL, Greene County, IL, Knox County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, Menard County, IL, Morgan County, IL, Peoria County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Woodford County, IL, Adair County, MO, Grundy County, MO, Harrison County, MO, Knox County, MO, Lewis County, MO, Linn County, MO, Macon County, MO, Marion County, MO, Mercer County, MO, Monroe County, MO, Pike County, MO, Putnam County, MO, Ralls County, MO, Schuyler County, MO, Shelby County, MO, Sullivan County, MO
The radar
The Des Moines radar (KDMX), 192 km from the middle of the area, began a volume at 04:53 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
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 26, 12:31 AM CDT | Severe Thunderstorm Warning | ILX | Knox | 24 min |
| Jun 26, 12:38 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 67 min |
| Jun 26, 1:14 AM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 61 min |
| Jun 26, 1:46 AM CDT | Severe Thunderstorm Warning | LSX | Pike | 59 min |
| Jun 26, 3:30 AM CDT | Severe Thunderstorm Warning | EAX | Adair, Putnam, Sullivan | 45 min |
| Jun 26, 4:17 AM CDT | Severe Thunderstorm Warning | EAX | Adair, Putnam, Sullivan | 24 min |
| Jun 26, 4:19 AM CDT | Flash Flood Warning | EAX | Putnam, Sullivan | 7 hr |
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 00:00Z, 4.9 hours before the alert went out and 199 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
- 2577 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1016 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 110 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 25, 7:06 PM CDT | Severe Thunderstorm Watch | SPC | Hancock, Henderson, Henry, McDonough, Mercer, Rock Island and 1 more | 7 hr |
| Jun 25, 10:18 PM CDT | Mesoscale Discussion | SPC | Carroll, Fulton, Hancock, Henderson, Henry, Knox and 6 more | 87 min |
| Jun 26, 1:23 AM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Cass, Champaign, Christian, Clark and 38 more | 97 min |
| Jun 26, 3:48 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Carroll, Cass, Crawford and 10 more | 87 min |
| Jun 26, 5:39 AM CDT | Mesoscale Discussion | SPC | Wayne | 66 min |
| Jun 26, 6:38 AM CDT | Severe Thunderstorm Watch | SPC | Adair, Appanoose, Audubon, Boone, Buena Vista, Calhoun and 46 more | 6 hr |
| Jun 26, 7:51 AM CDT | Mesoscale Discussion | SPC | Boone, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 17 more | 84 min |
| Jun 26, 9:53 AM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Carroll, Cass, Clarke and 21 more | 97 min |
| Jun 26, 12:05 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Boone, Buena Vista and 45 more | 55 min |
Nearby
Severe Thunderstorm Watches in Illinois, 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.