Alert archive / Illinois / Mesoscale Discussions in 2017
Mesoscale Discussion 1354
The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2017, 5:11 PM CDT for 11 counties in Illinois; 7 counties in Iowa; 9 counties in Wisconsin. It was in force for 34 min.
The area
The outline as issued.
The facts
- Issued
- Jul 19, 2017, 5:11 PM CDT (22:11 UTC)
- Expired
- Jul 19, 2017, 5:45 PM CDT
- In force
- 34 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
All 27 counties
Buchanan County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Jo Daviess County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Stephenson County, IL, Whiteside County, IL, Winnebago County, IL, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Lafayette County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 113 km from the middle of the area, began a volume at 22:15 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
Davenport, (KDVN), launched 12:00Z, 10.2 hours before the alert went out and 136 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
- 147 J/kg
- Mixed-layer CIN
- -138 J/kg
- Mixed-layer LCL
- 1286 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 96 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
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 19, 5:45 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 17 more | 6 hr |
| Jul 19, 12:11 PM CDT | Mesoscale Discussion | SPC | Bremer, Buena Vista, Butler, Cerro Gordo, Cherokee, Chickasaw and 20 more | 2 hr |
| Jul 19, 12:36 PM CDT | Severe Thunderstorm Watch | SPC | Bremer, Butler, Cerro Gordo, Clay, Dickinson, Emmet and 7 more | 5 hr |
| Jul 19, 2:38 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Howard, Winneshiek | 2 hr |
| Jul 19, 3:29 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 6 hr |
| Jul 19, 4:52 PM CDT | Severe Thunderstorm Watch | SPC | Lyon, Plymouth, Sioux, Woodbury | 6 hr |
| Jul 19, 6:32 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 58 min |
Nearby
Mesoscale Discussions in Illinois, 2017Mesoscale Discussions in Wisconsin, 2017Mesoscale Discussions in Iowa, 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.