Alert archive / Illinois / Mesoscale Discussions in 2003
Mesoscale Discussion 1653
The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2003, 2:00 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2003, 2:00 PM CDT (19:00 UTC)
- Expired
- Jul 6, 2003, 4:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 74 counties
Boone County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Carroll County, IN, Cass County, IN, Clinton County, IN, Elkhart County, IN, Fountain County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Montgomery County, IN, Newton County, IN, Parke County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Tippecanoe County, IN, Vermillion County, IN, Warren County, IN, White County, IN, Allegan County, MI, Berrien County, MI, Cass County, MI, Van Buren County, MI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Walworth County, WI, Waukesha County, WI
The radar
The Chicago radar (KLOT), 45 km from the middle of the area, began a volume at 18:59 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, 7.0 hours before the alert went out and 123 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
- 1041 J/kg
- Mixed-layer CIN
- -148 J/kg
- Mixed-layer LCL
- 1114 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 153 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.4
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 |
|---|---|---|---|---|
| Jul 5, 7:20 PM CDT | Mesoscale Discussion | SPC | Edgar, Iroquois, Vermilion | 55 min |
| Jul 5, 7:51 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 40 more | 54 min |
| Jul 5, 10:46 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 33 more | 59 min |
| Jul 6, 5:17 AM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson, Whiteside | 118 min |
| Jul 6, 7:45 AM CDT | Mesoscale Discussion | SPC | Boone, DeKalb, DuPage, Kane, Lake, McHenry | 2 hr |
| Jul 6, 9:48 AM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Carroll, Cass and 34 more | 117 min |
| Jul 6, 11:45 AM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 28 more | 6 hr |
| Jul 6, 12:36 PM CDT | Mesoscale Discussion | SPC | Cook, Kankakee | 114 min |
| Jul 6, 1:10 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, Christian, Clark, Coles, Cumberland, DeWitt and 14 more | 5 hr |
| Jul 6, 5:28 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Champaign, Christian, Coles and 45 more | 62 min |
| Jul 6, 6:00 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Cook, DeKalb, DuPage, Ford, Grundy and 9 more | 5 hr |
| Jul 6, 1:25 PM CDT | Severe Thunderstorm Watch | SPC | DeKalb, Elkhart, Kosciusko, LaGrange, LaPorte, Marshall and 4 more | 5 hr |
| Jul 6, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Blackford, Carroll, Cass, Clinton and 26 more | 5 hr |
| Jul 6, 6:54 PM CDT | Mesoscale Discussion | SPC | Ashland, Barron, Bayfield, Burnett, Douglas, Polk and 1 more | 4 hr |
Nearby
Mesoscale Discussions in Illinois, 2003Mesoscale Discussions in Indiana, 2003Mesoscale Discussions in Wisconsin, 2003Every mesoscale discussion in 2003
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.