Alert archive / Illinois / Mesoscale Discussions in 2013
Mesoscale Discussion 487
The Storm Prediction Center issued this mesoscale discussion at Apr 16, 2013, 8:44 PM CDT for 41 counties in Illinois; 15 counties in Indiana; Saint Louis County, City of Saint Louis, Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 16, 2013, 8:44 PM CDT (01:44 UTC)
- Expired
- Apr 16, 2013, 10:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 58 counties
Bond County, IL, Calhoun County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Crawford County, IL, Cumberland County, IL, DeWitt County, IL, Douglas County, IL, Edgar County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Greene County, IL, Hamilton County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Lawrence County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Shelby County, IL, Vermilion County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Boone County, IN, Clay County, IN, Fountain County, IN, Greene County, IN, Hendricks County, IN, Knox County, IN, Montgomery County, IN, Owen County, IN, Parke County, IN, Putnam County, IN, Sullivan County, IN, Tippecanoe County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, City of Saint Louis, MO, Saint Louis County, MO
The radar
The Evansville,IN radar (KVWX), 111 km from the middle of the area, began a volume at 01:44 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, 1.7 hours before the alert went out and 117 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
- 1490 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 390 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
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 |
|---|---|---|---|---|
| Apr 16, 8:02 PM CDT | Mesoscale Discussion | SPC | Edwards, Gallatin, Hamilton, Hardin, Saline, Wabash and 1 more | 88 min |
| Apr 17, 8:49 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Cass, DeWitt, Ford and 32 more | 56 min |
| Apr 17, 9:14 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more | 10 hr |
| Apr 17, 9:30 AM CDT | Mesoscale Discussion | SPC | Hardin | 2 hr |
| Apr 17, 11:11 AM CDT | Tornado Watch | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 1 more | 11 hr |
| Apr 17, 12:39 PM CDT | Severe Thunderstorm Watch | SPC | Hardin, Pope | 5 hr |
| Apr 17, 1:33 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 30 more | 57 min |
| Apr 17, 3:04 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Clark, Coles, Cumberland and 26 more | 56 min |
| Apr 17, 3:33 PM CDT | Tornado Watch | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 24 more | 8 hr |
| Apr 17, 3:38 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 1 more | 97 min |
| Apr 17, 3:53 PM CDT | Mesoscale Discussion | SPC | Hardin, Pope | 67 min |
| Apr 17, 6:02 PM CDT | Mesoscale Discussion | SPC | Calhoun, Greene, Jersey, Pike | 88 min |
| Apr 17, 6:46 PM CDT | Mesoscale Discussion | SPC | Cass, Champaign, Christian, Coles, DeWitt, Douglas and 18 more | 89 min |
| Apr 17, 4:39 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clay, Daviess, Dubois, Greene and 12 more | 96 min |
| Apr 17, 9:50 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Buchanan, Caldwell and 34 more | 55 min |
| Apr 17, 4:19 PM CDT | Mesoscale Discussion | SPC | Scotland | 26 min |
Nearby
Mesoscale Discussions in Illinois, 2013Mesoscale Discussions in Indiana, 2013Mesoscale Discussions in Missouri, 2013Every mesoscale discussion in 2013
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.