Alert archive / Illinois / Mesoscale Discussions in 2009
Mesoscale Discussion 907
The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2009, 1:31 PM CDT for 21 counties in Illinois; 12 counties in Indiana; Clinton County, Scott County, Iowa. It was in force for 59 min.
The area
The outline as issued.
The facts
- Issued
- Jun 1, 2009, 1:31 PM CDT (18:31 UTC)
- Expired
- Jun 1, 2009, 2:30 PM CDT
- In force
- 59 min
- Issued by
- the Storm Prediction Center
All 35 counties
Clinton County, IA, Scott County, IA, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Whiteside County, IL, Will County, IL, Benton County, IN, Carroll County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, Tippecanoe County, IN, Warren County, IN, White County, IN
The radar
The Chicago radar (KLOT), 60 km from the middle of the area, began a volume at 18:35 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, 6.5 hours before the alert went out and 131 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
- 335 J/kg
- Mixed-layer CIN
- -222 J/kg
- Mixed-layer LCL
- 1332 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 197 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
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 |
|---|---|---|---|---|
| Jun 1, 2:37 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Champaign, Cook, DeKalb, DeWitt, DuPage and 32 more | 7 hr |
| Jun 1, 6:34 PM CDT | Mesoscale Discussion | SPC | Bureau, DuPage, Ford, Grundy, Iroquois, Kankakee and 13 more | 86 min |
| Jun 1, 5:25 PM CDT | Severe Thunderstorm Watch | SPC | Wayne | 5 hr |
| Jun 1, 2:55 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Cass, Clarke, Decatur and 13 more | 2 hr |
| Jun 1, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Cass, Cedar, Clarke and 31 more | 8 hr |
| Jun 1, 5:25 PM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 12 more | 2 hr |
| Jun 1, 6:52 PM CDT | Mesoscale Discussion | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 14 more | 83 min |
Nearby
Mesoscale Discussions in Illinois, 2009Mesoscale Discussions in Indiana, 2009Mesoscale Discussions in Iowa, 2009Every mesoscale discussion in 2009
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.