Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1761
The Storm Prediction Center issued this mesoscale discussion at Aug 15, 2007, 7:50 AM CDT for 15 counties in Illinois; 13 counties in Iowa; 6 counties in Wisconsin. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Aug 15, 2007, 7:50 AM CDT (12:50 UTC)
- Expired
- Aug 15, 2007, 8:45 AM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 34 counties
Allamakee County, IA, Benton County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, LaSalle County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Crawford County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Rock County, WI
The radar
The Quad Cities radar (KDVN), 81 km from the middle of the area, began a volume at 12:51 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
Davenport, (KDVN), launched 12:00Z, 0.8 hours before the alert went out and 81 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
- 1040 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 755 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 15, 7:15 AM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Lee, Ogle, Stephenson, Whiteside and 1 more | 60 min |
| Aug 15, 7:52 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, DeKalb, Grundy, Henry and 20 more | 5 hr |
| Aug 15, 12:04 PM CDT | Mesoscale Discussion | SPC | Bureau, Henderson, Henry, Knox, Marshall, Mercer and 8 more | 86 min |
| Aug 15, 2:28 AM CDT | Mesoscale Discussion | SPC | Dickinson, Lyon, O'Brien, Osceola, Sioux | 92 min |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Iowa, 2007Mesoscale Discussions in Wisconsin, 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.