Alert archive / Illinois / Tornado Watches in 2015
Tornado Watch 413
The Storm Prediction Center issued this tornado watch at Jul 13, 2015, 4:01 PM CDT for 58 counties in Illinois; 8 counties in Indiana; 9 counties in Iowa. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 13, 2015, 4:01 PM CDT (21:01 UTC)
- Expired
- Jul 13, 2015, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 75 counties
Cedar County, IA, Clinton County, IA, Des Moines County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Boone County, IL, Bureau County, IL, Carroll County, IL, Cass County, IL, Champaign County, IL, Christian County, IL, Coles County, IL, Cook County, IL, DeKalb County, IL, DeWitt County, IL, Douglas County, IL, DuPage County, IL, Edgar County, IL, Ford County, IL, Fulton County, IL, Grundy County, IL, Hancock County, IL, Henderson 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, Mercer County, IL, Morgan County, IL, Moultrie 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, 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, Fountain County, IN, Jasper County, IN, Lake County, IN, Newton County, IN, Porter County, IN, Vermillion County, IN, Warren County, IN
The radar
The Quad Cities radar (KDVN), 77 km from the middle of the area, began a volume at 21:02 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 80%
- 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
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 4:36 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Scott | 39 min |
| Jul 13, 4:59 PM CDT | Severe Thunderstorm Warning | LOT | LaSalle | 61 min |
| Jul 13, 5:08 PM CDT | Severe Thunderstorm Warning | DVN | Rock Island, Whiteside | 27 min |
| Jul 13, 5:37 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, LaSalle, Livingston | 53 min |
| Jul 13, 5:53 PM CDT | Severe Thunderstorm Warning | DVN | Hancock | 37 min |
| Jul 13, 5:54 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry | 39 min |
| Jul 13, 6:29 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Grundy, Kankakee, Livingston | 61 min |
| Jul 13, 6:38 PM CDT | Severe Thunderstorm Warning | LOT | Grundy, Kendall, Will | 52 min |
| Jul 13, 6:40 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 35 min |
| Jul 13, 6:46 PM CDT | Severe Thunderstorm Warning | ILX | Cass, Morgan, Scott | 44 min |
| Jul 13, 6:48 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Henry, Putnam | 37 min |
| Jul 13, 7:11 PM CDT | Severe Thunderstorm Warning | LOT | Kankakee, Will | 49 min |
| Jul 13, 7:14 PM CDT | Severe Thunderstorm Warning | IND | Tippecanoe, Warren | 46 min |
| Jul 13, 7:21 PM CDT | Severe Thunderstorm Warning | LOT | Cook | 24 min |
| Jul 13, 7:22 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois, Kankakee | 53 min |
| Jul 13, 7:37 PM CDT | Severe Thunderstorm Warning | LOT | Lake | 38 min |
| Jul 13, 7:42 PM CDT | Severe Thunderstorm Warning | LOT | Benton | 33 min |
| Jul 13, 7:54 PM CDT | Tornado Warning | IND | Tippecanoe, Warren | 36 min |
| Jul 13, 8:00 PM CDT | Flash Flood Warning | LOT | Benton | 5 hr |
| Jul 13, 8:01 PM CDT | Flash Flood Warning | IND | Tippecanoe, Warren | 3 hr |
| Jul 13, 8:16 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois, Kankakee | 44 min |
| Jul 13, 8:21 PM CDT | Severe Thunderstorm Warning | DVN | Bureau, Putnam | 30 min |
| Jul 13, 8:23 PM CDT | Tornado Warning | IND | Tippecanoe, Warren | 19 min |
| Jul 13, 8:46 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 29 min |
| Jul 13, 8:51 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 39 min |
| Jul 13, 8:59 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 31 min |
| Jul 13, 9:34 PM CDT | Severe Thunderstorm Warning | LOT | Boone, McHenry, Winnebago | 41 min |
| Jul 13, 9:34 PM CDT | Severe Thunderstorm Warning | LOT | Lake, Porter | 30 min |
| Jul 13, 9:56 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DeKalb, DuPage, Kane | 33 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, 9.0 hours before the alert went out and 70 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
- 3490 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 832 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 6.3
The text
As transmitted, in the capitals the NWS used until 2016.
551
WWUS20 KWNS 132059
SEL3
SPC WW 132059
IAZ000-ILZ000-INZ000-LMZ000-140400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 413
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT MON JUL 13 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* TORNADO WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHERN AND CENTRAL ILLINOIS
NORTHWEST INDIANA
LAKE MICHIGAN
* EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
1100 PM CDT.
* PRIMARY THREATS INCLUDE...
A COUPLE TORNADOES POSSIBLE
WIDESPREAD DAMAGING WIND GUSTS TO 70 MPH LIKELY
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 3
INCHES IN DIAMETER POSSIBLE
SUMMARY...SEVERE THUNDERSTORMS SHOULD GRADUALLY INCREASE THROUGH
LATE AFTERNOON/EARLY EVENING ACROSS FAR EASTERN IOWA AND MUCH OF
NORTHERN/CENTRAL ILLINOIS INTO NORTHWEST INDIANA. SUPERCELLS CAPABLE
OF LARGE HAIL AND A COUPLE OF TORNADOES WILL INITIALLY BE
POSSIBLE...PARTICULARLY IN AREAS NEAR A REMNANT OUTFLOW BOUNDARY.
LATER THIS EVENING A MORE WIDESPREAD DAMAGING WIND RISK MAY EVOLVE.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 110 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES WEST NORTHWEST OF
ROCKFORD ILLINOIS TO 30 MILES SOUTH SOUTHWEST OF BLOOMINGTON
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 410...WW 411...WW 412...
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 30030.
...GUYERSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 13, 3:49 AM CDT | Mesoscale Discussion | SPC | Boone, Cook, DeKalb, DuPage, Grundy, Iroquois and 7 more | 116 min |
| Jul 13, 4:14 AM CDT | Severe Thunderstorm Watch | SPC | Boone, Bureau, Carroll, Cook, DeKalb, DuPage and 18 more | 6 hr |
| Jul 13, 7:19 AM CDT | Mesoscale Discussion | SPC | Ford, Grundy, Iroquois, Kankakee, Kendall, LaSalle and 2 more | 86 min |
| Jul 13, 9:17 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Coles, Crawford, Cumberland, DeWitt and 16 more | 4 hr |
| Jul 13, 11:01 AM CDT | Mesoscale Discussion | SPC | Edwards, Wabash, White | 89 min |
| Jul 13, 3:21 PM CDT | Mesoscale Discussion | SPC | Boone, Bureau, Carroll, Champaign, DeKalb, DeWitt and 29 more | 84 min |
| Jul 13, 4:33 PM CDT | Mesoscale Discussion | SPC | Adams, Bond, Brown, Calhoun, Christian, Clinton and 14 more | 57 min |
| Jul 13, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Bond, Brown, Calhoun, Clinton, Fayette and 11 more | 4 hr |
| Jul 13, 6:59 PM CDT | Mesoscale Discussion | SPC | Boone, Brown, Bureau, Carroll, Cass, Champaign and 65 more | 91 min |
| Jul 13, 11:55 AM CDT | Severe Thunderstorm Watch | SPC | Clark, Crawford, Dearborn, Dubois, Floyd, Harrison and 8 more | 7 hr |
| Jul 13, 2:04 PM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Dubois, Floyd, Harrison, Orange and 1 more | 86 min |
| Jul 12, 7:51 PM CDT | Mesoscale Discussion | SPC | Dickinson, Emmet, Kossuth, Winnebago | 114 min |
| Jul 12, 9:03 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Howard, Winneshiek | 117 min |
| Jul 12, 9:41 PM CDT | Mesoscale Discussion | SPC | Bremer, Butler, Cerro Gordo, Chickasaw, Floyd, Hancock and 4 more | 94 min |
| Jul 12, 9:59 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more | 6 hr |
| Jul 12, 11:55 PM CDT | Mesoscale Discussion | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 7 more | 95 min |
| Jul 13, 2:00 AM CDT | Mesoscale Discussion | SPC | Allamakee, Clayton, Fayette, Winneshiek | 2 hr |
| Jul 13, 3:11 PM CDT | Severe Thunderstorm Watch | SPC | Allamakee | 6 hr |
Nearby
Tornado Watches in Illinois, 2015Tornado Watches in Iowa, 2015Tornado Watches in Indiana, 2015Every tornado watch in 2015
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.