Alert archive / Indiana / Tornado Watches in 2007
Tornado Watch 721
The Storm Prediction Center issued this tornado watch at Oct 18, 2007, 4:37 AM CDT for Ford County, Iroquois County, Kankakee County, Illinois; 49 counties in Indiana; 7 counties in Kentucky. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 18, 2007, 4:37 AM CDT (09:37 UTC)
- Expired
- Oct 18, 2007, 8:06 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 70 kt
All 59 counties
Ford County, IL, Iroquois County, IL, Kankakee County, IL, Bartholomew County, IN, Benton County, IN, Boone County, IN, Brown County, IN, Carroll County, IN, Clark County, IN, Clay County, IN, Clinton County, IN, Crawford County, IN, Daviess County, IN, Decatur County, IN, Dubois County, IN, Floyd County, IN, Fountain County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Howard County, IN, Jackson County, IN, Jasper County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lake County, IN, Lawrence County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Montgomery County, IN, Morgan County, IN, Newton County, IN, Orange County, IN, Owen County, IN, Parke County, IN, Perry County, IN, Porter County, IN, Putnam County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Tippecanoe County, IN, Tipton County, IN, Vermillion County, IN, Vigo County, IN, Warren County, IN, Washington County, IN, Breckinridge County, KY, Hancock County, KY, Jefferson County, KY, Meade County, KY, Ohio County, KY, Oldham County, KY, Trimble County, KY
The radar
The Indianapolis radar (KIND), 87 km from the middle of the area, began a volume at 09:37 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 18, 4:52 AM CDT | Severe Thunderstorm Warning | IND | Clay, Greene, Sullivan, Vigo | 25 min |
| Oct 18, 5:15 AM CDT | Severe Thunderstorm Warning | IND | Clay, Owen | 19 min |
| Oct 18, 6:31 AM CDT | Severe Thunderstorm Warning | LMK | Crawford, Dubois, Orange | 29 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, 9.6 hours before the alert went out and 119 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
- 579 J/kg
- Mixed-layer CIN
- -45 J/kg
- Mixed-layer LCL
- 645 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 336 m²/s²
- 0-3 km storm-relative helicity
- 386 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 7.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 180944
SEL1
SPC WW 180944
ILZ000-INZ000-KYZ000-181400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 721
NWS STORM PREDICTION CENTER NORMAN OK
535 AM EDT THU OCT 18 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHEASTERN ILLINOIS
WESTERN AND CENTRAL INDIANA
NORTHWESTERN KENTUCKY
EFFECTIVE THIS THURSDAY MORNING FROM 535 AM UNTIL 1000 AM EDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE
MILES EITHER SIDE OF A LINE FROM 65 MILES NORTH NORTHWEST OF
DANVILLE ILLINOIS TO 10 MILES SOUTH OF LOUISVILLE KENTUCKY. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).
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 718...WW 719...WW 720...
DISCUSSION...STRONG SHORTWAVE TROUGH IS MOVING NEWD THROUGH MO INTO
IL. THIS SYSTEM IS FORCING A LINE OF STORMS EAST-NORTHEASTWARD AT 50
KT THROUGH ILLINOIS INTO INDIANA. STRONG ENVIRONMENTAL WINDS AND
THE FAST MOTION OF THE STORMS SUGGEST WIND DAMAGE IS THE MAIN
THREAT. HOWEVER...THE COMBINATION OF 1 KM SHEAR AT 40-50 KT AND
DEWPOINTS IN THE MID AND UPPER 60S INDICATE A POTENTIAL FOR ISOLATED
TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 23050.
...IMYSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 17, 7:57 PM CDT | Mesoscale Discussion | SPC | Adams, Brown, Fulton, Hancock, Henderson, McDonough and 3 more | 63 min |
| Oct 17, 10:56 PM CDT | Mesoscale Discussion | SPC | Adams, Alexander, Bond, Brown, Calhoun, Cass and 34 more | 64 min |
| Oct 17, 11:40 PM CDT | Tornado Watch | SPC | Alexander, Bond, Calhoun, Clinton, Fayette, Greene and 13 more | 4 hr |
| Oct 18, 2:01 AM CDT | Tornado Watch | SPC | Cass, Champaign, Christian, Clark, Clay, Coles and 29 more | 5 hr |
| Oct 18, 2:02 AM CDT | Mesoscale Discussion | SPC | Bond, Calhoun, Christian, Clinton, Fayette, Greene and 14 more | 58 min |
| Oct 18, 2:27 AM CDT | Tornado Watch | SPC | Edwards, Franklin, Gallatin, Hamilton, Hardin, Jefferson and 9 more | 4 hr |
| Oct 18, 4:08 AM CDT | Mesoscale Discussion | SPC | Alexander, Champaign, Clark, Clay, Coles, Crawford and 34 more | 67 min |
| Oct 18, 11:36 AM CDT | Mesoscale Discussion | SPC | Boone, Carroll, Kane, McHenry, Ogle, Stephenson and 1 more | 2 hr |
| Oct 18, 1:31 PM CDT | Tornado Watch | SPC | Alexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more | 9 hr |
| Oct 18, 1:44 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 23 more | 2 hr |
| Oct 18, 3:23 PM CDT | Tornado Watch | SPC | Bond, Champaign, Christian, Clark, Clay, Clinton and 28 more | 8 hr |
| Oct 18, 5:39 PM CDT | Mesoscale Discussion | SPC | Alexander, Gallatin, Hamilton, Hardin, Johnson, Massac and 6 more | 66 min |
| Oct 18, 6:34 PM CDT | Mesoscale Discussion | SPC | Champaign, Clark, Clay, Clinton, Coles, Crawford and 16 more | 116 min |
| Oct 18, 10:26 AM CDT | Mesoscale Discussion | SPC | Clark, Crawford, Floyd, Harrison, Perry, Spencer | 2 hr |
| Oct 18, 1:59 PM CDT | Mesoscale Discussion | SPC | Allen, Cass, DeKalb, Elkhart, Fulton, Huntington and 13 more | 61 min |
| Oct 18, 12:27 AM CDT | Mesoscale Discussion | SPC | Ballard, Calloway, Carlisle, Fulton, Graves, Hickman and 3 more | 93 min |
| Oct 18, 6:30 PM CDT | Mesoscale Discussion | SPC | Bath, Boone, Bourbon, Bracken, Campbell, Clark and 17 more | 90 min |
Nearby
Tornado Watches in Indiana, 2007Tornado Watches in Kentucky, 2007Tornado Watches in Illinois, 2007Every tornado 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.