Alert archive / Illinois / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 138
The Storm Prediction Center issued this severe thunderstorm watch at Apr 10, 2017, 1:48 PM CDT for 4 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2017, 1:48 PM CDT (18:48 UTC)
- Expired
- Apr 10, 2017, 10:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 97 counties
Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, Cumberland County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Effingham County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Henry County, IL, Iroquois County, IL, Jo Daviess 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, Moultrie County, IL, Ogle County, IL, Peoria County, IL, Piatt County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Shelby County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Vermilion County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Winnebago County, IL, Woodford County, IL, Benton County, IN, Jasper County, IN, Lake County, IN, LaPorte County, IN, Newton County, IN, Porter County, IN, Saint Joseph County, IN, Starke County, IN, Allegan County, MI, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Mecosta County, MI, Montcalm County, MI, Muskegon County, MI, Newaygo County, MI, Ottawa County, MI, Saint Joseph County, MI, Van Buren County, MI, Dane County, WI, Dodge County, WI, Green County, WI, Jefferson County, WI, Kenosha County, WI, Lafayette County, WI, Milwaukee County, WI, Ozaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI
The radar
The Chicago radar (KLOT), 75 km from the middle of the area, began a volume at 18:51 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
- 10%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 2:19 PM CDT | Severe Thunderstorm Warning | DVN | McDonough | 12 min |
| Apr 10, 2:21 PM CDT | Severe Thunderstorm Warning | MKX | Green, Lafayette | 39 min |
| Apr 10, 2:25 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Knox | 50 min |
| Apr 10, 2:28 PM CDT | Severe Thunderstorm Warning | ILX | Cumberland, Effingham, Jasper | 32 min |
| Apr 10, 2:43 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Green, Rock | 30 min |
| Apr 10, 3:02 PM CDT | Severe Thunderstorm Warning | ILX | Fulton, Peoria | 43 min |
| Apr 10, 3:37 PM CDT | Severe Thunderstorm Warning | ILX | Peoria, Tazewell, Woodford | 11 min |
| Apr 10, 3:45 PM CDT | Severe Thunderstorm Warning | ILX | Peoria, Tazewell, Woodford | 45 min |
| Apr 10, 4:09 PM CDT | Severe Thunderstorm Warning | ILX | Christian, Sangamon | 16 min |
| Apr 10, 4:14 PM CDT | Severe Thunderstorm Warning | LOT | Livingston | 61 min |
| Apr 10, 4:18 PM CDT | Severe Thunderstorm Warning | LOT | Lake, McHenry | 42 min |
| Apr 10, 7:11 PM CDT | Severe Thunderstorm Warning | GRR | Kent | 34 min |
| Apr 10, 7:16 PM CDT | Severe Thunderstorm Warning | ILX | Macon, Moultrie, Piatt, Shelby | 29 min |
| Apr 10, 7:37 PM CDT | Tornado Warning | GRR | Ionia, Kent | 23 min |
| Apr 10, 7:47 PM CDT | Severe Thunderstorm Warning | GRR | Allegan | 28 min |
| Apr 10, 8:18 PM CDT | Severe Thunderstorm Warning | ILX | Douglas | 27 min |
| Apr 10, 8:27 PM CDT | Severe Thunderstorm Warning | LOT | Lake, Porter | 37 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 12:00Z, 6.8 hours before the alert went out and 204 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2257 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 1:53 AM CDT | Mesoscale Discussion | SPC | Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 9 more | 2 hr |
| Apr 10, 11:57 AM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Cook, DeKalb, DuPage, Ford and 23 more | 3 hr |
| Apr 10, 3:25 PM CDT | Mesoscale Discussion | SPC | Bond, Boone, Bureau, Cass, Champaign, Christian and 54 more | 2 hr |
| Apr 10, 6:22 PM CDT | Mesoscale Discussion | SPC | Champaign, Christian, Coles, Cook, DeWitt, Douglas and 19 more | 53 min |
| Apr 10, 12:01 AM CDT | Severe Thunderstorm Watch | SPC | Dickinson, Iron, Marquette | 3 hr |
| Apr 10, 2:16 AM CDT | Mesoscale Discussion | SPC | Alger, Delta, Dickinson, Marquette, Menominee, Schoolcraft | 119 min |
| Apr 9, 8:06 PM CDT | Mesoscale Discussion | SPC | Barron, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 8 more | 54 min |
| Apr 9, 9:01 PM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Chippewa, Clark, Dunn, Eau Claire, Jackson and 3 more | 4 hr |
| Apr 9, 11:32 PM CDT | Mesoscale Discussion | SPC | Adams, Buffalo, Chippewa, Clark, Dunn, Eau Claire and 25 more | 58 min |
Nearby
Severe Thunderstorm Watches in Illinois, 2017Severe Thunderstorm Watches in Michigan, 2017Severe Thunderstorm Watches in Wisconsin, 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.