Alert archive / Illinois / Mesoscale Discussions in 2026
Mesoscale Discussion 1949
The Storm Prediction Center issued this mesoscale discussion at Aug 12, 2026, 9:04 AM CDT for 26 counties in Illinois; 11 counties in Indiana. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Aug 12, 2026, 9:04 AM CDT (14:04 UTC)
- Expired
- Aug 12, 2026, 11:00 AM CDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe thunderstorm watch 574
All 37 counties
Bureau County, IL, Champaign County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McLean County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Putnam County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN
The radar
The Lincoln radar (KILX), 99 km from the middle of the area, began a volume at 14:07 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 2.1 hours before the alert went out and 59 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
- 2166 J/kg
- Mixed-layer CIN
- -186 J/kg
- Mixed-layer LCL
- 1652 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 8:04 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Cook, DeKalb, DuPage, Ford and 21 more | 2 hr |
| Aug 12, 6:41 AM CDT | Severe Thunderstorm Watch | SPC | Bureau, Champaign, Cook, DeKalb, DeWitt, DuPage and 31 more | 6 hr |
| Aug 12, 12:12 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Coles, Cumberland and 25 more | 63 min |
| Aug 12, 2:24 PM CDT | Severe Thunderstorm Watch | SPC | Edwards, Wabash | 5 hr |
| Aug 12, 4:33 PM CDT | Mesoscale Discussion | SPC | Alexander, Clinton, Franklin, Gallatin, Hamilton, Hardin and 17 more | 117 min |
| Aug 12, 10:35 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Bartholomew, Blackford, Boone, Brown, Carroll and 50 more | 5 hr |
| Aug 12, 12:52 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Boone, Brown, Clark, Clay, Clinton and 39 more | 113 min |
Nearby
Mesoscale Discussions in Illinois, 2026Mesoscale Discussions in Indiana, 2026Every mesoscale discussion in 2026
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.