Alert archive / Illinois / Mesoscale Discussions in 2008
Mesoscale Discussion 2264
The Storm Prediction Center issued this mesoscale discussion at Sep 13, 2008, 5:27 PM CDT for 19 counties in Illinois; Lincoln County, Pike County, Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 13, 2008, 5:27 PM CDT (22:27 UTC)
- Expired
- Sep 13, 2008, 7:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, DeWitt County, IL, Greene County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Mason County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Pike County, IL, Sangamon County, IL, Scott County, IL, Tazewell County, IL, Lincoln County, MO, Pike County, MO
The radar
The Lincoln radar (KILX), 82 km from the middle of the area, began a volume at 22:29 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 nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.5 hours before the alert went out and 137 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
- 1141 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 631 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 203 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 6.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 11:44 PM CDT | Mesoscale Discussion | SPC | Ford, Grundy, Iroquois, Kankakee, Knox, LaSalle and 9 more | 91 min |
| Sep 13, 1:29 AM CDT | Mesoscale Discussion | SPC | Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more | 91 min |
| Sep 13, 1:46 AM CDT | Tornado Watch | SPC | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more | 6 hr |
| Sep 13, 3:28 AM CDT | Mesoscale Discussion | SPC | Cook, DeKalb, DuPage, Ford, Grundy, Iroquois and 11 more | 92 min |
| Sep 12, 7:11 PM CDT | Mesoscale Discussion | SPC | Bates, Carroll, Cass, Cooper, Henry, Howard and 6 more | 94 min |
Nearby
Mesoscale Discussions in Illinois, 2008Mesoscale Discussions in Missouri, 2008Every mesoscale discussion 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.