Alert archive / Illinois / Mesoscale Discussions in 2018
Mesoscale Discussion 978
The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2018, 3:37 PM CDT for 52 counties in Illinois; 8 counties in Indiana. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jul 1, 2018, 3:37 PM CDT (20:37 UTC)
- Expired
- Jul 1, 2018, 5:00 PM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 60 counties
Bond County, IL, Boone County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Clark County, IL, Coles County, IL, Cook County, IL, Cumberland County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Effingham County, IL, Fayette County, IL, Ford County, IL, Greene County, IL, Grundy County, IL, Iroquois County, IL, Jasper County, IL, Jersey County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Montgomery County, IL, Morgan County, IL, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Scott County, IL, Shelby County, IL, Tazewell County, IL, Vermilion County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Fountain County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Vermillion County, IN, Warren County, IN
The radar
The Lincoln radar (KILX), 19 km from the middle of the area, began a volume at 20:41 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 12:00Z, 8.6 hours before the alert went out and 52 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
- 1834 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 123 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.5
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 |
|---|---|---|---|---|
| Jul 1, 11:37 AM CDT | Mesoscale Discussion | SPC | Boone, Jo Daviess, McHenry, Stephenson, Winnebago | 83 min |
| Jul 1, 12:23 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Boone, Brown, Bureau, Carroll and 56 more | 97 min |
| Jul 1, 12:58 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Boone, Bureau, Cass, Champaign, Christian and 49 more | 7 hr |
| Jul 1, 6:51 PM CDT | Mesoscale Discussion | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 22 more | 114 min |
Nearby
Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Indiana, 2018Every mesoscale discussion in 2018
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.