Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1865
The Storm Prediction Center issued this mesoscale discussion at Aug 23, 2007, 3:10 PM CDT for 13 counties in Illinois; Jasper County, Lake County, Newton County, Indiana. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Aug 23, 2007, 3:10 PM CDT (20:10 UTC)
- Expired
- Aug 23, 2007, 4:45 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
Counties Cook County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, Livingston County, IL, McHenry County, IL, McLean County, IL, Will County, IL, Jasper County, IN, Lake County, IN, Newton County, IN
The radar
The Chicago radar (KLOT), 30 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 141 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
- 1293 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 1289 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.7
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 |
|---|---|---|---|---|
| Aug 22, 7:21 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 25 more | 2 hr |
| Aug 23, 10:36 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 33 more | 114 min |
| Aug 23, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 35 more | 7 hr |
| Aug 23, 5:38 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 25 more | 97 min |
| Aug 23, 1:48 AM CDT | Mesoscale Discussion | SPC | DeKalb, LaGrange, Noble, Steuben, Whitley | 27 min |
| Aug 23, 2:07 PM CDT | Mesoscale Discussion | SPC | Allen, Cass, DeKalb, Elkhart, Fulton, Huntington and 13 more | 83 min |
| Aug 23, 3:09 PM CDT | Severe Thunderstorm Watch | SPC | Allen, DeKalb, Elkhart, Fulton, Kosciusko, LaGrange and 8 more | 8 hr |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Indiana, 2007Every mesoscale discussion in 2007
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.