Alert archive / Illinois / Mesoscale Discussions in 2007
Mesoscale Discussion 1601
The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2007, 5:25 PM CDT for 21 counties in Illinois; 4 counties in Kentucky; 10 counties in Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 27, 2007, 5:25 PM CDT (22:25 UTC)
- Expired
- Jul 27, 2007, 7:00 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 35 counties
Alexander County, IL, Bond County, IL, Clinton County, IL, Franklin County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Madison County, IL, Massac County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Washington County, IL, Williamson County, IL, Ballard County, KY, Crittenden County, KY, Livingston County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO
The radar
The St Louis radar (KLSX), 101 km from the middle of the area, began a volume at 22:25 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
Nashville Metro, TN (KBNA), launched 12:00Z, 10.4 hours before the alert went out and 359 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
- 1139 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 964 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 27 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 |
|---|---|---|---|---|
| Jul 26, 9:53 PM CDT | Mesoscale Discussion | SPC | Boone, Jo Daviess, Kane, McHenry, Ogle, Stephenson and 1 more | 97 min |
| Jul 27, 2:34 PM CDT | Mesoscale Discussion | SPC | Alexander, Clinton, Edwards, Franklin, Gallatin, Hamilton and 18 more | 56 min |
| Jul 27, 12:46 PM CDT | Mesoscale Discussion | SPC | Adair, Allen, Anderson, Barren, Bath, Boone and 93 more | 89 min |
| Jul 27, 1:33 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allen, Anderson, Barren, Bath, Bell and 100 more | 7 hr |
Nearby
Mesoscale Discussions in Illinois, 2007Mesoscale Discussions in Missouri, 2007Mesoscale Discussions in Kentucky, 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.