Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1740
The Storm Prediction Center issued this mesoscale discussion at Aug 13, 2007, 12:26 AM CDT for 29 counties in Illinois; 5 counties in Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Aug 13, 2007, 12:26 AM CDT (05:26 UTC)
- Expired
- Aug 13, 2007, 1:30 AM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
All 34 counties
Bond County, IL, Calhoun County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Effingham County, IL, Fayette County, IL, Greene County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Washington County, IL, Wayne County, IL, City of Saint Louis, MO, Lincoln County, MO, Saint Charles County, MO, Saint Louis County, MO, Warren County, MO
The radar
The St Louis radar (KLSX), 92 km from the middle of the area, began a volume at 05:27 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 nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 5.4 hours before the alert went out and 154 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
- 3036 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1497 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 5.5
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 12, 8:30 PM CDT | Mesoscale Discussion | SPC | Adams, Hancock | 90 min |
| Aug 12, 9:23 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Pike | 4 hr |
| Aug 13, 2:59 AM CDT | Mesoscale Discussion | SPC | Adair, Mercer, Putnam, Schuyler, Scotland, Sullivan | 61 min |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Missouri, 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.