Alert archive / Illinois / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 333
The Storm Prediction Center issued this severe thunderstorm watch at Jul 6, 2016, 1:55 AM CDT for 39 counties in Illinois; 9 counties in Indiana; 6 counties in Iowa. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2016, 1:55 AM CDT (06:55 UTC)
- Expired
- Jul 6, 2016, 7:35 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 65 kt
All 54 counties
Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Van Buren County, IA, Bureau County, IL, Cass County, IL, Champaign County, IL, Cook County, IL, DeWitt 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, Lake County, IL, LaSalle County, IL, Livingston County, IL, Logan County, IL, Macon County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, McLean County, IL, Menard County, IL, Mercer County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Schuyler County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Will County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Pulaski County, IN, Starke County, IN, White County, IN
The radar
The Quad Cities radar (KDVN), 86 km from the middle of the area, began a volume at 06:54 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 2:47 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage, Will | 58 min |
| Jul 6, 3:09 AM CDT | Severe Thunderstorm Warning | DVN | Mercer, Rock Island | 51 min |
| Jul 6, 3:38 AM CDT | Severe Thunderstorm Warning | LOT | Cook, Kankakee, Will | 54 min |
| Jul 6, 3:46 AM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Mercer, Putnam, Rock Island | 59 min |
| Jul 6, 4:12 AM CDT | Severe Thunderstorm Warning | ILX | Knox, Peoria, Stark | 48 min |
| Jul 6, 4:36 AM CDT | Severe Thunderstorm Warning | ILX | Peoria, Tazewell, Woodford | 39 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 00:00Z, 6.9 hours before the alert went out and 81 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
- 1788 J/kg
- Mixed-layer CIN
- -111 J/kg
- Mixed-layer LCL
- 1054 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 8:38 PM CDT | Mesoscale Discussion | SPC | Carroll, Jo Daviess, Stephenson | 67 min |
| Jul 5, 9:50 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Carroll, DeKalb, Jo Daviess, Lee, Ogle and 4 more | 7 hr |
| Jul 5, 10:46 PM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Jo Daviess, Ogle, Stephenson, Winnebago | 89 min |
| Jul 6, 1:27 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DeWitt and 35 more | 2 hr |
| Jul 6, 5:04 AM CDT | Mesoscale Discussion | SPC | Adams, Brown, Cass, Champaign, Christian, Clark and 41 more | 116 min |
| Jul 6, 10:32 AM CDT | Mesoscale Discussion | SPC | Alexander, Pulaski, Union | 58 min |
| Jul 6, 10:48 AM CDT | Severe Thunderstorm Watch | SPC | Alexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more | 5 hr |
| Jul 6, 12:53 PM CDT | Mesoscale Discussion | SPC | Alexander, Franklin, Gallatin, Hardin, Jackson, Johnson and 6 more | 67 min |
| Jul 5, 7:38 PM CDT | Mesoscale Discussion | SPC | Clay, Dickinson, Emmet, O'Brien, Osceola, Winnebago | 97 min |
| Jul 5, 8:10 PM CDT | Severe Thunderstorm Watch | SPC | Harrison, Monona, Pottawattamie, Shelby | 5 hr |
| Jul 5, 10:15 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Calhoun, Carroll, Crawford, Franklin and 13 more | 90 min |
| Jul 5, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Boone, Calhoun, Carroll, Cass and 22 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2016Severe Thunderstorm Watches in Indiana, 2016Severe Thunderstorm Watches in Iowa, 2016Every severe thunderstorm watch in 2016
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.