Alert archive / Illinois / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 345
The Storm Prediction Center issued this severe thunderstorm watch at Jun 17, 2017, 5:39 PM CDT for 51 counties in Illinois; 12 counties in Iowa; 9 counties in Missouri. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2017, 5:39 PM CDT (22:39 UTC)
- Expired
- Jun 18, 2017, 1:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 72 counties
Appanoose County, IA, Davis County, IA, Des Moines County, IA, Henry County, IA, Jefferson County, IA, Lee County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Wapello County, IA, Wayne County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Cass County, IL, Champaign County, IL, Cook County, IL, DeKalb 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, Lee 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, Morgan County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Rock Island County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Adair County, MO, Clark County, MO, Knox County, MO, Lewis County, MO, Marion County, MO, Putnam County, MO, Schuyler County, MO, Scotland County, MO, Shelby County, MO
The radar
The Quad Cities radar (KDVN), 78 km from the middle of the area, began a volume at 22:40 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
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
40 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 5:39 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Wayne | 37 min |
| Jun 17, 6:05 PM CDT | Severe Thunderstorm Warning | DVN | Henry, Mercer, Rock Island | 40 min |
| Jun 17, 6:13 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Davis | 32 min |
| Jun 17, 6:15 PM CDT | Severe Thunderstorm Warning | EAX | Putnam, Schuyler | 45 min |
| Jun 17, 6:19 PM CDT | Severe Thunderstorm Warning | DMX | Monroe, Wapello | 14 min |
| Jun 17, 6:25 PM CDT | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 35 min |
| Jun 17, 6:30 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Monroe, Wapello | 20 min |
| Jun 17, 6:31 PM CDT | Severe Thunderstorm Warning | LOT | Lee | 44 min |
| Jun 17, 6:38 PM CDT | Severe Thunderstorm Warning | DVN | Scotland | 52 min |
| Jun 17, 6:42 PM CDT | Tornado Warning | EAX | Schuyler | 22 min |
| Jun 17, 6:45 PM CDT | Severe Thunderstorm Warning | DMX | Davis | 15 min |
| Jun 17, 7:19 PM CDT | Severe Thunderstorm Warning | DVN | Clark, Scotland | 41 min |
| Jun 17, 7:27 PM CDT | Severe Thunderstorm Warning | DVN | Hancock, Henderson | 48 min |
| Jun 17, 7:37 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Stark | 53 min |
| Jun 17, 7:53 PM CDT | Severe Thunderstorm Warning | DVN | Hancock | 52 min |
| Jun 17, 8:02 PM CDT | Severe Thunderstorm Warning | ILX | Marshall, Peoria, Tazewell, Woodford | 43 min |
| Jun 17, 8:03 PM CDT | Flash Flood Warning | ILX | Stark | 3 hr |
| Jun 17, 8:04 PM CDT | Severe Thunderstorm Warning | DVN | Clark, Scotland | 41 min |
| Jun 17, 8:06 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, Kane, Kendall, LaSalle | 39 min |
| Jun 17, 8:11 PM CDT | Flash Flood Warning | ILX | Marshall | 3 hr |
| Jun 17, 8:19 PM CDT | Severe Thunderstorm Warning | LSX | Adams | 41 min |
| Jun 17, 8:25 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Kane, Lake, McHenry | 29 min |
| Jun 17, 8:28 PM CDT | Severe Thunderstorm Warning | LSX | Lewis | 18 min |
| Jun 17, 8:40 PM CDT | Flash Flood Warning | ILX | Peoria, Tazewell, Woodford | 3 hr |
| Jun 17, 8:54 PM CDT | Severe Thunderstorm Warning | ILX | McLean, Woodford | 51 min |
| Jun 17, 8:58 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Livingston | 47 min |
| Jun 17, 9:09 PM CDT | Severe Thunderstorm Warning | LSX | Knox, Lewis | 23 min |
| Jun 17, 9:10 PM CDT | Flash Flood Warning | ILX | McLean | 3 hr |
| Jun 17, 9:20 PM CDT | Severe Thunderstorm Warning | LSX | Adams, Brown | 40 min |
| Jun 17, 9:24 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan, Schuyler | 56 min |
| Jun 17, 9:25 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois, Livingston | 65 min |
| Jun 17, 10:06 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan | 39 min |
| Jun 17, 10:09 PM CDT | Severe Thunderstorm Warning | ILX | Champaign, Vermilion | 52 min |
| Jun 17, 10:13 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 77 min |
| Jun 17, 10:29 PM CDT | Severe Thunderstorm Warning | LSX | Marion, Ralls, Shelby | 46 min |
| Jun 17, 10:34 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 41 min |
| Jun 17, 10:41 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Morgan, Sangamon | 64 min |
| Jun 17, 10:48 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Shelby | 30 min |
| Jun 17, 11:47 PM CDT | Flash Flood Warning | ILX | Christian, Sangamon | 3 hr |
| Jun 18, 12:32 AM CDT | Flash Flood Warning | LOT | Livingston | 6 hr |
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, 10.7 hours before the alert went out and 79 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
- 613 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 726 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 16, 10:25 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 9 more | 5 hr |
| Jun 17, 1:35 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, DeKalb, Henry, Jo Daviess and 15 more | 115 min |
| Jun 17, 2:44 PM CDT | Mesoscale Discussion | SPC | Adams, Boone, Bureau, Carroll, Cook, DeKalb and 32 more | 2 hr |
| Jun 16, 7:52 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Appanoose, Audubon, Boone, Cass and 23 more | 9 hr |
| Jun 16, 9:27 PM CDT | Mesoscale Discussion | SPC | Adams, Fremont, Mills, Montgomery, Page, Ringgold and 1 more | 2 hr |
| Jun 16, 11:14 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Bates, Benton, Boone, Buchanan and 37 more | 91 min |
| Jun 16, 11:36 PM CDT | Severe Thunderstorm Watch | SPC | Audrain, Boone, Callaway, Cole, Gasconade, Knox and 11 more | 3 hr |
| Jun 17, 12:09 AM CDT | Severe Thunderstorm Watch | SPC | Barry, Barton, Benton, Camden, Cedar, Dade and 18 more | 9 hr |
| Jun 17, 2:58 AM CDT | Mesoscale Discussion | SPC | Barton, Bates, Benton, Camden, Cedar, Christian and 25 more | 2 hr |
| Jun 17, 5:31 AM CDT | Mesoscale Discussion | SPC | Barry, Barton, Cedar, Christian, Dade, Greene and 7 more | 89 min |
| Jun 17, 3:45 PM CDT | Mesoscale Discussion | SPC | Andrew, Bates, Buchanan, Caldwell, Carroll, Cass and 11 more | 3 hr |
| Jun 17, 6:12 PM CDT | Severe Thunderstorm Watch | SPC | Bates, Buchanan, Caldwell, Carroll, Cass, Chariton and 20 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Illinois, 2017Severe Thunderstorm Watches in Iowa, 2017Severe Thunderstorm Watches in Missouri, 2017Every severe thunderstorm watch in 2017
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.