Alert archive / Indiana / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 536
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2007, 7:29 PM CDT for 11 counties in Illinois; 29 counties in Indiana; 4 counties in Michigan. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2007, 7:29 PM CDT (00:29 UTC)
- Expired
- Jul 19, 2007, 2:29 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 44 counties
Cook County, IL, DuPage County, IL, Ford County, IL, Grundy County, IL, Iroquois County, IL, Kane County, IL, Kankakee County, IL, Kendall County, IL, Lake County, IL, McHenry County, IL, Will County, IL, Adams County, IN, Allen County, IN, Benton County, IN, Blackford County, IN, Cass County, IN, DeKalb County, IN, Elkhart County, IN, Fulton County, IN, Grant County, IN, Huntington County, IN, Jasper County, IN, Jay County, IN, Kosciusko County, IN, LaGrange County, IN, Lake County, IN, LaPorte County, IN, Marshall County, IN, Miami County, IN, Newton County, IN, Noble County, IN, Porter County, IN, Pulaski County, IN, Saint Joseph County, IN, Starke County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, White County, IN, Whitley County, IN, Berrien County, MI, Branch County, MI, Cass County, MI, Saint Joseph County, MI
The radar
The Chicago radar (KLOT), 87 km from the middle of the area, began a volume at 00:31 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
- 95%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 7:32 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane | 58 min |
| Jul 18, 8:02 PM CDT | Tornado Warning | IWX | Saint Joseph | 43 min |
| Jul 18, 8:28 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 47 min |
| Jul 18, 8:45 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 60 min |
| Jul 18, 8:50 PM CDT | Severe Thunderstorm Warning | IWX | DeKalb, Noble | 55 min |
| Jul 18, 9:04 PM CDT | Severe Thunderstorm Warning | LOT | Will | 51 min |
| Jul 18, 9:11 PM CDT | Flash Flood Warning | IWX | Allen, DeKalb, Elkhart, Kosciusko, LaGrange, Marshall and 1 more | 3 hr |
| Jul 18, 9:11 PM CDT | Flash Flood Warning | IWX | LaPorte, Saint Joseph | 3 hr |
| Jul 18, 9:12 PM CDT | Severe Thunderstorm Warning | LOT | DuPage, Kane | 22 min |
| Jul 18, 9:15 PM CDT | Severe Thunderstorm Warning | LOT | Kendall | 82 min |
| Jul 18, 9:24 PM CDT | Severe Thunderstorm Warning | IWX | LaPorte, Marshall, Saint Joseph | 51 min |
| Jul 18, 9:31 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Will | 48 min |
| Jul 18, 9:45 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 25 min |
| Jul 18, 9:50 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Grundy, Kendall, Will | 6 hr |
| Jul 18, 9:50 PM CDT | Flash Flood Warning | LOT | Cook, DuPage, Grundy, Kane, Kendall, Will | 6 hr |
| Jul 18, 10:00 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 40 min |
| Jul 18, 10:01 PM CDT | Severe Thunderstorm Warning | IWX | Marshall, Starke | 44 min |
| Jul 18, 10:22 PM CDT | Flash Flood Warning | IWX | Adams, Allen, Huntington, Wabash, Wells, Whitley | 6 hr |
| Jul 18, 10:22 PM CDT | Flash Flood Warning | IWX | Fulton, Kosciusko, Marshall, Pulaski, Starke | 6 hr |
| Jul 18, 10:22 PM CDT | Flash Flood Warning | IWX | LaPorte | 6 hr |
| Jul 18, 10:26 PM CDT | Tornado Warning | IWX | Kosciusko, Marshall | 49 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
Lincoln, IL (KILX), launched 00:00Z, 0.5 hours before the alert went out and 205 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
- 3514 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 1072 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 171 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 13.8
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 9:06 PM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Champaign, Coles, Cook, DeKalb and 38 more | 84 min |
| Jul 18, 10:23 PM CDT | Mesoscale Discussion | SPC | Mercer, Rock Island | 97 min |
| Jul 18, 11:07 PM CDT | Severe Thunderstorm Watch | SPC | Bureau, Hancock, Henderson, Henry, McDonough, Mercer and 4 more | 4 hr |
| Jul 19, 1:27 PM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Clark, Clay, Clinton, Coles and 26 more | 93 min |
| Jul 19, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | Bond, Calhoun, Clay, Clinton, Crawford, Edwards and 30 more | 6 hr |
| Jul 19, 5:38 PM CDT | Mesoscale Discussion | SPC | Clinton, Edwards, Franklin, Gallatin, Hamilton, Hardin and 17 more | 97 min |
| Jul 19, 11:45 AM CDT | Mesoscale Discussion | SPC | Bartholomew, Brown, Clark, Crawford, Daviess, Dearborn and 31 more | 60 min |
| Jul 19, 12:07 PM CDT | Severe Thunderstorm Watch | SPC | Bartholomew, Brown, Clark, Dearborn, Decatur, Fayette and 13 more | 8 hr |
| Jul 19, 2:54 PM CDT | Mesoscale Discussion | SPC | Jackson, Lenawee, Monroe, Washtenaw, Wayne | 96 min |
Nearby
Severe Thunderstorm Watches in Indiana, 2007Severe Thunderstorm Watches in Illinois, 2007Severe Thunderstorm Watches in Michigan, 2007Every severe thunderstorm watch in 2007
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.