Alert archive / Illinois / Mesoscale Discussions in 2018
Mesoscale Discussion 691
The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2018, 11:44 PM CDT for 14 counties in Illinois; 11 counties in Iowa; Grant County, Green County, Lafayette County, Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 9, 2018, 11:44 PM CDT (04:44 UTC)
- Expired
- Jun 10, 2018, 1:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 28 counties
Cedar County, IA, Clinton County, IA, Dubuque County, IA, Iowa County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Henry County, IL, Jo Daviess County, IL, LaSalle County, IL, Lee County, IL, Mercer County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Grant County, WI, Green County, WI, Lafayette County, WI
The radar
The Quad Cities radar (KDVN), 39 km from the middle of the area, began a volume at 04:49 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
Davenport, (KDVN), launched 00:00Z, 4.7 hours before the alert went out and 44 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
- 1247 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1107 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 142 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.7
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 9, 7:43 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Carroll, Henry, Jo Daviess, Lee, Ogle and 5 more | 6 hr |
| Jun 9, 10:17 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Henry, Jo Daviess, LaSalle and 8 more | 118 min |
| Jun 10, 10:04 AM CDT | Mesoscale Discussion | SPC | Bond, Cass, Champaign, Christian, Clark, Clay and 43 more | 116 min |
| Jun 10, 12:17 PM CDT | Mesoscale Discussion | SPC | Bond, Brown, Cass, Christian, Clark, Clay and 34 more | 118 min |
| Jun 10, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 7 hr |
| Jun 10, 2:42 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Clark, Clay, Coles, Crawford and 20 more | 93 min |
| Jun 10, 2:56 PM CDT | Severe Thunderstorm Watch | SPC | Edwards, Wabash, Wayne, White | 5 hr |
| Jun 10, 4:30 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Calhoun, Greene, Jersey, Macoupin and 3 more | 90 min |
| Jun 10, 5:20 PM CDT | Mesoscale Discussion | SPC | Edwards, Lawrence, Wabash, Wayne, White | 85 min |
| Jun 10, 1:23 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Calhoun, Carroll and 23 more | 3 hr |
Nearby
Mesoscale Discussions in Illinois, 2018Mesoscale Discussions in Iowa, 2018Mesoscale Discussions in Wisconsin, 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.