Alert archive / Illinois / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 332
The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2015, 9:39 AM CDT for 25 counties in Illinois; 5 counties in Indiana; 10 counties in Wisconsin. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 22, 2015, 9:39 AM CDT (14:39 UTC)
- Expired
- Jun 22, 2015, 12:55 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 40 counties
Boone County, IL, Bureau County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Marshall County, IL, McHenry County, IL, Ogle County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Dodge County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Milwaukee radar (KMKX), 39 km from the middle of the area, began a volume at 14:39 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 5%
- Ten or more severe wind reports
- 80%
- One or more gusts of 65 knots or more
- 80%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 9:47 AM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 58 min |
| Jun 22, 9:58 AM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Dodge, Green, Iowa, Jefferson and 4 more | 62 min |
| Jun 22, 10:38 AM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Kenosha, Milwaukee, Racine, Walworth, Waukesha | 53 min |
| Jun 22, 10:57 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Lee, Ogle | 33 min |
| Jun 22, 11:14 AM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle, Lee | 46 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 2.7 hours before the alert went out and 197 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
- 1240 J/kg
- Mixed-layer CIN
- -232 J/kg
- Mixed-layer LCL
- 853 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 7:08 PM CDT | Mesoscale Discussion | SPC | Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson and 6 more | 67 min |
| Jun 22, 7:42 AM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson, Whiteside | 93 min |
| Jun 22, 8:08 AM CDT | Severe Thunderstorm Watch | SPC | Carroll, Jo Daviess, Stephenson | 4 hr |
| Jun 22, 9:14 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Grundy and 11 more | 61 min |
| Jun 22, 11:00 AM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Grundy, Henry and 11 more | 2 hr |
| Jun 22, 1:22 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Bureau, Carroll, Cass, Fulton and 21 more | 113 min |
| Jun 22, 3:56 PM CDT | Tornado Watch | SPC | Bureau, Carroll, Cass, Champaign, Coles, DeKalb and 34 more | 9 hr |
| Jun 22, 6:08 PM CDT | Mesoscale Discussion | SPC | Bureau, DeWitt, Fulton, Grundy, Hancock, Henderson and 21 more | 67 min |
| Jun 22, 2:09 PM CDT | Mesoscale Discussion | SPC | Adams, Allen, DeKalb, Elkhart, Fulton, Huntington and 7 more | 96 min |
| Jun 22, 12:23 PM CDT | Severe Thunderstorm Watch | SPC | Allegan, Arenac, Barry, Bay, Calhoun, Clare and 34 more | 4 hr |
| Jun 22, 4:48 PM CDT | Severe Thunderstorm Watch | SPC | Dickinson, Gogebic, Iron, Menominee, Ontonagon | 4 hr |
| Jun 22, 4:53 AM CDT | Mesoscale Discussion | SPC | Buffalo, Crawford, La Crosse, Pierce, Richland, Vernon | 2 hr |
| Jun 22, 6:03 AM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Chippewa, Clark, Crawford, Dunn, Eau Claire and 10 more | 4 hr |
| Jun 22, 2:50 PM CDT | Mesoscale Discussion | SPC | Barron, Burnett, Douglas, Polk, Saint Croix, Washburn | 55 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2015Severe Thunderstorm Watches in Wisconsin, 2015Severe Thunderstorm Watches in Indiana, 2015Every severe thunderstorm watch 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.