Alert archive / Illinois / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 493
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2012, 12:58 PM CDT for 5 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2012, 12:58 PM CDT (17:58 UTC)
- Expired
- Jul 18, 2012, 8:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 93 counties
Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Delaware County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Howard County, IA, Jackson County, IA, Johnson County, IA, Jones County, IA, Linn County, IA, Mitchell County, IA, Muscatine County, IA, Scott County, IA, Winneshiek County, IA, Worth County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess 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, Stephenson 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, MN, Fillmore County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Buffalo County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Lafayette County, WI, Milwaukee County, WI, Monroe County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The La Crosse radar (KARX), 126 km from the middle of the area, began a volume at 18:01 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
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
22 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 1:29 PM CDT | Severe Thunderstorm Warning | ARX | Mower | 61 min |
| Jul 18, 2:24 PM CDT | Severe Thunderstorm Warning | ARX | Fillmore | 51 min |
| Jul 18, 3:07 PM CDT | Severe Thunderstorm Warning | LOT | Benton, Jasper, Newton | 33 min |
| Jul 18, 3:19 PM CDT | Severe Thunderstorm Warning | ARX | Winneshiek | 41 min |
| Jul 18, 3:22 PM CDT | Severe Thunderstorm Warning | ARX | Chickasaw | 38 min |
| Jul 18, 3:57 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Winneshiek | 39 min |
| Jul 18, 4:23 PM CDT | Severe Thunderstorm Warning | ARX | Crawford, Vernon | 52 min |
| Jul 18, 4:57 PM CDT | Severe Thunderstorm Warning | ARX | Crawford | 33 min |
| Jul 18, 5:27 PM CDT | Severe Thunderstorm Warning | MKX | Green, Rock | 33 min |
| Jul 18, 5:34 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 32 min |
| Jul 18, 5:36 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 39 min |
| Jul 18, 5:51 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 39 min |
| Jul 18, 6:03 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Green, Iowa, Sauk | 42 min |
| Jul 18, 6:19 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 26 min |
| Jul 18, 6:21 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 54 min |
| Jul 18, 6:27 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Winnebago | 78 min |
| Jul 18, 6:41 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Dodge, Green, Iowa, Jefferson and 3 more | 49 min |
| Jul 18, 6:43 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dodge, Sauk | 62 min |
| Jul 18, 7:19 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson, Racine, Rock, Walworth, Washington and 1 more | 56 min |
| Jul 18, 7:24 PM CDT | Severe Thunderstorm Warning | DVN | Stephenson | 36 min |
| Jul 18, 7:24 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Ogle, Winnebago | 66 min |
| Jul 18, 7:57 PM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Kane, McHenry, Ogle, Winnebago | 63 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 11:38 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 11 more | 67 min |
| Jul 18, 3:07 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, DuPage, Grundy and 20 more | 53 min |
| Jul 18, 6:56 PM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Jo Daviess and 8 more | 94 min |
| Jul 18, 11:54 AM CDT | Mesoscale Discussion | SPC | Adams, Allen, Blackford, Decatur, Delaware, Fayette and 15 more | 2 hr |
| Jul 18, 12:16 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Allen, Bartholomew, Blackford, Carroll, Cass and 28 more | 8 hr |
| Jul 18, 3:21 PM CDT | Mesoscale Discussion | SPC | Bartholomew, Blackford, Boone, Brown, Cass, Clinton and 30 more | 84 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2012Severe Thunderstorm Watches in Iowa, 2012Severe Thunderstorm Watches in Wisconsin, 2012Every severe thunderstorm watch in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.