Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 378
The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2017, 11:56 AM CDT for 43 counties in Illinois; 5 counties in Kentucky; 11 counties in Missouri. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Mar 30, 2017, 11:56 AM CDT (16:56 UTC)
- Expired
- Mar 30, 2017, 1:00 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
All 59 counties
Alexander County, IL, Bond County, IL, Calhoun County, IL, Christian County, IL, Clay County, IL, Clinton County, IL, Coles County, IL, Cumberland County, IL, Douglas County, IL, Edwards County, IL, Effingham County, IL, Fayette County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jasper County, IL, Jefferson County, IL, Jersey County, IL, Johnson County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Marion County, IL, Massac County, IL, Monroe County, IL, Montgomery County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pope County, IL, Pulaski County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Saline County, IL, Shelby County, IL, Union County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Ballard County, KY, Carlisle County, KY, Fulton County, KY, Hickman County, KY, McCracken County, KY, Bollinger County, MO, Cape Girardeau County, MO, City of Saint Louis, MO, Madison County, MO, Mississippi County, MO, New Madrid County, MO, Perry County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Scott County, MO, Stoddard County, MO
The radar
The St Louis radar (KLSX), 131 km from the middle of the area, began a volume at 16:58 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
Lincoln, IL (KILX), launched 12:00Z, 4.9 hours before the alert went out and 207 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
- 847 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 347 m²/s²
- 0-3 km storm-relative helicity
- 373 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 12:31 PM CDT | Severe Thunderstorm Watch | SPC | Alexander, Bond, Cass, Champaign, Christian, Clark and 51 more | 7 hr |
| Mar 30, 3:27 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 19 more | 33 min |
| Mar 30, 12:55 PM CDT | Mesoscale Discussion | SPC | Boone, Bracken, Campbell, Carroll, Gallatin, Grant and 7 more | 2 hr |
| Mar 30, 5:40 PM CDT | Mesoscale Discussion | SPC | Allen, Barren, Breckinridge, Bullitt, Butler, Caldwell and 28 more | 65 min |
| Mar 29, 7:52 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Carter, Crawford, Franklin, Gasconade and 9 more | 53 min |
| Mar 29, 8:22 PM CDT | Tornado Watch | SPC | Boone, Butler, Callaway, Carter, Cole, Crawford and 15 more | 5 hr |
| Mar 29, 9:44 PM CDT | Mesoscale Discussion | SPC | Boone, Callaway, Carter, Cole, Crawford, Dent and 24 more | 91 min |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Kentucky, 2017Every mesoscale discussion in 2017
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.