Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 1077
The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2017, 9:50 PM CDT for 38 counties in Illinois; 17 counties in Indiana; 24 counties in Missouri. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2017, 9:50 PM CDT (02:50 UTC)
- Expired
- Jun 17, 2017, 10:45 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
All 79 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, 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, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Perry County, IL, Piatt County, IL, Pike County, IL, Randolph County, IL, Richland County, IL, Saint Clair County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Vermilion County, IL, Washington County, IL, Benton County, IN, Boone County, IN, Carroll County, IN, Clay County, IN, Clinton County, IN, Fountain County, IN, Hendricks 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, White County, IN, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Crawford County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Iron County, MO, Jefferson County, MO, Lincoln County, MO, Maries County, MO, Montgomery County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Ralls County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Warren County, MO, Washington County, MO
The radar
The St Louis radar (KLSX), 106 km from the middle of the area, began a volume at 02:53 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 00:00Z, 2.8 hours before the alert went out and 140 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
- 606 J/kg
- Mixed-layer CIN
- -96 J/kg
- Mixed-layer LCL
- 1403 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 5.3
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 |
|---|---|---|---|---|
| Jun 17, 8:17 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Brown, Bureau, Cass, Champaign and 52 more | 58 min |
| Jun 17, 10:53 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Christian, Clay, Clinton, Coles and 22 more | 6 hr |
| Jun 18, 1:40 AM CDT | Mesoscale Discussion | SPC | Bond, Clay, Clinton, Crawford, Cumberland, Edwards and 18 more | 3 hr |
| Jun 18, 2:34 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 3 hr |
| Jun 18, 4:48 AM CDT | Mesoscale Discussion | SPC | Gallatin, Hardin, Johnson, Massac, Pope, Pulaski | 117 min |
| Jun 17, 8:23 PM CDT | Mesoscale Discussion | SPC | Bates, Benton, Boone, Buchanan, Caldwell, Carroll and 26 more | 2 hr |
| Jun 17, 9:34 PM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Boone, Camden, Carroll and 29 more | 116 min |
| Jun 17, 10:18 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Benton, Camden, Cedar, Hickory, Jasper and 4 more | 6 hr |
| Jun 17, 11:55 PM CDT | Mesoscale Discussion | SPC | Barton, Cedar, Dade, Jasper, Lawrence, McDonald and 3 more | 95 min |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Indiana, 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.