Alert archive / Illinois / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 829
The Storm Prediction Center issued this severe thunderstorm watch at Sep 3, 2011, 3:05 PM CDT for 4 states. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 3, 2011, 3:05 PM CDT (20:05 UTC)
- Expired
- Sep 3, 2011, 10:18 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 73 counties
Bureau County, IL, Cook County, IL, DuPage County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Knox County, IL, LaSalle County, IL, Livingston County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Mercer County, IL, Peoria County, IL, Putnam County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Jasper County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, White County, IN, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI, Fulton County, OH, Williams County, OH
The radar
The Chicago radar (KLOT), 54 km from the middle of the area, began a volume at 20:06 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
- 70%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
32 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 3, 3:22 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Will | 53 min |
| Sep 3, 3:42 PM CDT | Severe Thunderstorm Warning | DVN | Warren | 14 min |
| Sep 3, 3:44 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Knox | 61 min |
| Sep 3, 3:44 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle, Livingston | 28 min |
| Sep 3, 3:45 PM CDT | Severe Thunderstorm Warning | IWX | Elkhart, LaGrange, Noble | 45 min |
| Sep 3, 3:47 PM CDT | Tornado Warning | DTX | Sanilac | 28 min |
| Sep 3, 3:55 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Peoria, Tazewell, Woodford | 50 min |
| Sep 3, 4:01 PM CDT | Severe Thunderstorm Warning | IWX | Saint Joseph | 59 min |
| Sep 3, 4:14 PM CDT | Severe Thunderstorm Warning | IWX | LaPorte, Starke | 61 min |
| Sep 3, 4:22 PM CDT | Severe Thunderstorm Warning | IWX | Elkhart | 38 min |
| Sep 3, 4:30 PM CDT | Severe Thunderstorm Warning | IWX | Branch | 60 min |
| Sep 3, 4:35 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Peoria, Stark, Woodford | 40 min |
| Sep 3, 4:40 PM CDT | Severe Thunderstorm Warning | IWX | Elkhart, LaGrange | 35 min |
| Sep 3, 4:48 PM CDT | Severe Thunderstorm Warning | GRR | Calhoun | 42 min |
| Sep 3, 5:00 PM CDT | Severe Thunderstorm Warning | IWX | LaPorte, Marshall, Saint Joseph, Starke | 45 min |
| Sep 3, 5:05 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Woodford | 25 min |
| Sep 3, 5:05 PM CDT | Severe Thunderstorm Warning | IWX | Hillsdale | 40 min |
| Sep 3, 5:19 PM CDT | Severe Thunderstorm Warning | IWX | Pulaski, Starke | 25 min |
| Sep 3, 5:32 PM CDT | Severe Thunderstorm Warning | DTX | Washtenaw | 38 min |
| Sep 3, 5:40 PM CDT | Severe Thunderstorm Warning | IWX | Elkhart, Kosciusko | 50 min |
| Sep 3, 5:44 PM CDT | Severe Thunderstorm Warning | DTX | Wayne | 28 min |
| Sep 3, 5:48 PM CDT | Severe Thunderstorm Warning | IWX | Hillsdale | 22 min |
| Sep 3, 6:15 PM CDT | Severe Thunderstorm Warning | GRR | Jackson | 15 min |
| Sep 3, 6:21 PM CDT | Severe Thunderstorm Warning | IWX | LaGrange | 27 min |
| Sep 3, 6:39 PM CDT | Severe Thunderstorm Warning | DTX | Washtenaw | 45 min |
| Sep 3, 6:59 PM CDT | Severe Thunderstorm Warning | IWX | Kosciusko, Wabash, Whitley | 28 min |
| Sep 3, 7:24 PM CDT | Severe Thunderstorm Warning | DTX | Lenawee, Monroe | 30 min |
| Sep 3, 7:32 PM CDT | Severe Thunderstorm Warning | DTX | Macomb, Oakland | 53 min |
| Sep 3, 8:04 PM CDT | Severe Thunderstorm Warning | DTX | Monroe, Wayne | 22 min |
| Sep 3, 8:08 PM CDT | Severe Thunderstorm Warning | DTX | Saint Clair | 37 min |
| Sep 3, 8:38 PM CDT | Severe Thunderstorm Warning | DTX | Lapeer | 40 min |
| Sep 3, 9:41 PM CDT | Severe Thunderstorm Warning | DTX | Lenawee | 29 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 |
|---|---|---|---|---|
| Sep 2, 11:56 PM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Ogle, Stephenson, Whiteside, Winnebago | 94 min |
| Sep 3, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Jo Daviess, McHenry, Stephenson, Winnebago | 6 hr |
| Sep 3, 12:24 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DeKalb, DuPage, Ford, Grundy and 13 more | 66 min |
| Sep 3, 5:02 PM CDT | Mesoscale Discussion | SPC | Bureau, Cook, DuPage, Ford, Fulton, Grundy and 23 more | 58 min |
| Sep 3, 5:53 AM CDT | Mesoscale Discussion | SPC | Clinton, Genesee, Gratiot, Ionia, Isabella, Kent and 5 more | 97 min |
| Sep 3, 6:22 AM CDT | Severe Thunderstorm Watch | SPC | Allegan, Barry, Bay, Clinton, Eaton, Genesee and 19 more | 5 hr |
| Sep 3, 9:45 AM CDT | Mesoscale Discussion | SPC | Arenac, Bay, Huron, Sanilac, Tuscola | 60 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2011Severe Thunderstorm Watches in Michigan, 2011Severe Thunderstorm Watches in Indiana, 2011Every severe thunderstorm watch in 2011
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.