Alert archive / Illinois / Mesoscale Discussions in 2015
Mesoscale Discussion 1464
The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2015, 12:31 PM CDT for 28 counties in Illinois; 27 counties in Iowa; 25 counties in Wisconsin. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2015, 12:31 PM CDT (17:31 UTC)
- Expired
- Jul 18, 2015, 2:30 PM CDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 80 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Buchanan County, IA, Cedar County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Washington County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, DuPage County, IL, Grundy County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Marshall County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Winnebago County, WI
The radar
The Quad Cities radar (KDVN), 70 km from the middle of the area, began a volume at 17:33 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, 5.5 hours before the alert went out and 66 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
- 2984 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 858 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 23 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 1:31 PM CDT | Tornado Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 20 more | 5 hr |
| Jul 18, 5:43 PM CDT | Mesoscale Discussion | SPC | DeKalb, DuPage, Grundy, Kane, Kankakee, Kendall and 1 more | 92 min |
| Jul 17, 8:55 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 5 hr |
| Jul 17, 8:57 PM CDT | Mesoscale Discussion | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 15 more | 3 hr |
| Jul 17, 11:26 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 12 more | 2 hr |
| Jul 18, 2:05 AM CDT | Mesoscale Discussion | SPC | Howard, Mitchell, Winneshiek, Worth | 85 min |
| Jul 18, 3:06 AM CDT | Mesoscale Discussion | SPC | Allamakee, Winneshiek | 84 min |
| Jul 18, 12:23 AM CDT | Mesoscale Discussion | SPC | Buffalo, Dunn, Eau Claire, Jackson, La Crosse, Monroe and 5 more | 67 min |
| Jul 18, 12:41 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Barron, Buffalo, Chippewa, Clark, Dunn and 16 more | 5 hr |
| Jul 18, 3:56 AM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 16 more | 4 hr |
| Jul 18, 5:24 AM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Dodge, Fond du Lac, Manitowoc, Outagamie and 5 more | 96 min |
Nearby
Mesoscale Discussions in Illinois, 2015Mesoscale Discussions in Iowa, 2015Mesoscale Discussions in Wisconsin, 2015Every mesoscale discussion in 2015
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.