Alert archive / Illinois / Mesoscale Discussions in 2004
Mesoscale Discussion 2106
The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2004, 1:22 PM CDT for 48 counties in Illinois; Clinton County, Jackson County, Scott County, Iowa. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2004, 1:22 PM CDT (18:22 UTC)
- Expired
- Aug 25, 2004, 3:15 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
All 51 counties
Clinton County, IA, Jackson County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, DeKalb County, IL, DeWitt County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL
The radar
The Lincoln radar (KILX), 88 km from the middle of the area, began a volume at 18:24 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, 6.4 hours before the alert went out and 112 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
- 1166 J/kg
- Mixed-layer CIN
- -143 J/kg
- Mixed-layer LCL
- 777 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 201 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 25, 9:24 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, DeWitt, Fulton and 22 more | 2 hr |
| Aug 25, 11:59 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Hancock, Pike and 2 more | 91 min |
| Aug 25, 12:35 PM CDT | Tornado Watch | SPC | Adams, Brown, Hancock, Henderson, Mercer, Pike | 6 hr |
| Aug 25, 2:20 PM CDT | Tornado Watch | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 34 more | 6 hr |
| Aug 25, 3:15 PM CDT | Severe Thunderstorm Watch | SPC | Monroe, Saint Clair | 6 hr |
| Aug 25, 5:14 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Calhoun, Cass, Champaign, Christian and 34 more | 91 min |
| Aug 25, 8:50 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Clarke, Decatur, Fremont, Madison, Mills and 6 more | 5 hr |
| Aug 25, 1:31 PM CDT | Mesoscale Discussion | SPC | Lyon, O'Brien, Osceola, Sioux | 119 min |
Nearby
Mesoscale Discussions in Illinois, 2004Mesoscale Discussions in Iowa, 2004Every mesoscale discussion in 2004
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.