Alert archive / Illinois / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 747
The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2011, 5:38 PM CDT for 25 counties in Illinois; Benton County, Jasper County, Newton County, Indiana. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2011, 5:38 PM CDT (22:38 UTC)
- Expired
- Aug 8, 2011, 10:19 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 28 counties
Bureau County, IL, Champaign County, IL, DeWitt County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kankakee County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Newton County, IN
The radar
The Lincoln radar (KILX), 78 km from the middle of the area, began a volume at 22:40 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
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 5:50 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 25 min |
| Aug 8, 5:57 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Peoria, Stark, Tazewell, Woodford | 46 min |
| Aug 8, 7:28 PM CDT | Tornado Warning | ILX | McLean | 18 min |
| Aug 8, 7:29 PM CDT | Tornado Warning | LOT | Ford, Iroquois, Livingston | 34 min |
| Aug 8, 8:24 PM CDT | Tornado Warning | ILX | Champaign, Vermilion | 51 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 8:27 PM CDT | Mesoscale Discussion | SPC | Alexander, Jackson, Johnson, Massac, Pulaski, Randolph and 1 more | 2 hr |
| Aug 7, 10:54 PM CDT | Mesoscale Discussion | SPC | Alexander, Massac, Pulaski | 96 min |
| Aug 8, 1:06 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Henderson and 19 more | 84 min |
| Aug 8, 5:23 PM CDT | Mesoscale Discussion | SPC | Bureau, Cass, Champaign, Christian, DeWitt, Ford and 21 more | 67 min |
| Aug 8, 5:00 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Benton, Blackford, Boone, Carroll, Cass and 40 more | 2 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2011Severe Thunderstorm Watches in Indiana, 2011Every severe thunderstorm watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.