Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1686
The Storm Prediction Center issued this mesoscale discussion at Aug 8, 2007, 3:28 PM CDT for 29 counties in Illinois; Lee County, Iowa; Clark County, Lewis County, Marion County, Missouri. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2007, 3:28 PM CDT (20:28 UTC)
- Expired
- Aug 8, 2007, 4:30 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 33 counties
Lee County, IA, Adams County, IL, Brown County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Logan County, IL, Macon County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Morgan County, IL, Moultrie County, IL, Piatt County, IL, Pike County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Clark County, MO, Lewis County, MO, Marion County, MO
The radar
The Lincoln radar (KILX), 74 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1214 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 16 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 7, 8:13 PM CDT | Mesoscale Discussion | SPC | Bureau, Cass, DeWitt, Ford, Fulton, Grundy and 27 more | 92 min |
| Aug 8, 12:14 PM CDT | Mesoscale Discussion | SPC | Edgar, Iroquois, Vermilion | 91 min |
| Aug 8, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 28 more | 4 hr |
| Aug 8, 6:59 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Cass, Champaign, Christian and 29 more | 61 min |
| Aug 7, 11:46 PM CDT | Mesoscale Discussion | SPC | Fremont, Page, Taylor | 2 hr |
| Aug 8, 3:18 PM CDT | Mesoscale Discussion | SPC | Fremont, Page | 87 min |
| Aug 8, 4:43 PM CDT | Tornado Watch | SPC | Adams, Appanoose, Clarke, Davis, Decatur, Fremont and 10 more | 7 hr |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Iowa, 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.