Alert archive / Illinois / Tornado Watches in 2003

Tornado Watch 240

May 4, 20034 states

The Storm Prediction Center issued this tornado watch at May 4, 2003, 10:40 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 4, 2003, 10:40 PM CDT (03:40 UTC)
Expired
May 5, 2003, 4:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 45 counties

Edwards County, IL, Franklin County, IL, Gallatin County, IL, Hamilton County, IL, Hardin County, IL, Jackson County, IL, Jefferson County, IL, Johnson County, IL, Monroe County, IL, Perry County, IL, Pope County, IL, Randolph County, IL, Saint Clair County, IL, Saline County, IL, Union County, IL, Wabash County, IL, Washington County, IL, Wayne County, IL, White County, IL, Williamson County, IL, Gibson County, IN, Pike County, IN, Posey County, IN, Spencer County, IN, Vanderburgh County, IN, Warrick County, IN, Crittenden County, KY, Daviess County, KY, Henderson County, KY, Hopkins County, KY, McLean County, KY, Ohio County, KY, Union County, KY, Webster County, KY, Bollinger County, MO, Cape Girardeau County, MO, Franklin County, MO, Iron County, MO, Jefferson County, MO, Madison County, MO, Perry County, MO, Reynolds County, MO, Saint Francois County, MO, Sainte Genevieve County, MO, Washington County, MO

Warnings issued inside it

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 4, 10:47 PM CDTSevere Thunderstorm WarningPAHUnion, Webster43 min
May 4, 10:50 PM CDTSevere Thunderstorm WarningPAHUnion, Webster40 min
May 4, 10:55 PM CDTTornado WarningPAHWebster35 min
May 4, 11:09 PM CDTTornado WarningLSXIron, Washington51 min
May 4, 11:18 PM CDTSevere Thunderstorm WarningPAHVanderburgh, Warrick42 min
May 4, 11:33 PM CDTTornado WarningPAHDaviess, McLean42 min
May 4, 11:43 PM CDTTornado WarningLSXSaint Francois47 min
May 4, 11:58 PM CDTSevere Thunderstorm WarningLSXSainte Genevieve47 min
May 5, 12:58 AM CDTSevere Thunderstorm WarningPAHPerry32 min
May 5, 2:12 AM CDTSevere Thunderstorm WarningPAHWayne18 min
May 5, 2:56 AM CDTSevere Thunderstorm WarningLSXIron, Reynolds49 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, 3.7 hours before the alert went out and 235 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.

Skew-T log-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 2003-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 00:00Z on 2003-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 408 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
5 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
434 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
408 m²/s²
0-3 km storm-relative helicity
531 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 050335
SEL0  
SPC WW 050340
ILZ000-INZ000-KYZ000-MOZ000-050900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 240 
NWS STORM PREDICTION CENTER NORMAN OK 
1040 PM CDT SUN MAY 4 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTHERN ILLINOIS
       SOUTHWEST INDIANA
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1040 PM UNTIL
400 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 120 STATUTE MILES EAST AND
WEST OF A LINE FROM 25 MILES NORTHWEST OF MOUNT VERNON ILLINOIS TO
40 MILES EAST OF CAPE GIRARDEAU MISSOURI.

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 235...WW 236...WW 237...WW
238...WW 239...


DISCUSSION...TORNADIC SUPERCELLS ALONG THE WARM FRONT SE OF VIH AND
NE OF PAH WILL MOVE EWD ALONG THE WARM FRONT FOR THE NEXT FEW HOURS
WHILE THE BOUNDARY LIFTS SLOWLY NWD.  RICH LOW-LEVEL MOISTURE AND
VERY STRONG LOW-LEVEL SHEAR WILL SUPPORT A CONTINUED TORNADO THREAT
WITH STORMS NEAR THE WARM FRONT INTO THE EARLY MORNING HOURS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 26040.


...THOMPSON

383,0865 371,0863 371,0910 383,0912

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 4, 7:34 PM CDTMesoscale DiscussionSPCAlexander116 min
May 4, 8:05 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Bureau, Calhoun, Cass and 73 more85 min
May 4, 9:26 PM CDTMesoscale DiscussionSPCAlexander, Gallatin, Hardin, Johnson, Massac, Pope and 2 more2 hr
May 4, 11:05 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 33 more5 hr
May 5, 1:20 AM CDTTornado WatchSPCAlexander, Massac, Pulaski6 hr
May 5, 1:30 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 16 more90 min
May 5, 1:46 AM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 25 more89 min
May 5, 3:41 AM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 13 more34 min
May 5, 3:50 AM CDTTornado WatchSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more6 hr
May 5, 6:32 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 10 more88 min
May 5, 9:19 AM CDTMesoscale DiscussionSPCAlexander, Franklin, Gallatin, Hamilton, Hardin, Jackson and 13 more56 min
May 5, 12:20 PM CDTTornado WatchSPCHardin7 hr
May 4, 11:37 PM CDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Harrison, Jefferson and 5 more23 min
May 4, 11:45 PM CDTTornado WatchSPCClark, Crawford, Floyd, Harrison, Orange, Perry and 1 more5 hr
May 5, 2:31 AM CDTMesoscale DiscussionSPCCrawford, Floyd, Harrison89 min
May 5, 7:35 AM CDTTornado WatchSPCHarrison, Perry5 hr
May 5, 10:12 AM CDTMesoscale DiscussionSPCHarrison, Perry93 min
May 5, 11:59 AM CDTMesoscale DiscussionSPCHarrison, Perry61 min
May 5, 2:47 PM CDTMesoscale DiscussionSPCCrawford, Dubois, Floyd, Gibson, Harrison, Perry and 4 more118 min
May 5, 4:27 PM CDTMesoscale DiscussionSPCSteuben3 hr
May 5, 4:42 PM CDTMesoscale DiscussionSPCOhio3 hr
May 5, 6:33 PM CDTMesoscale DiscussionSPCClark, Crawford, Dubois, Floyd, Gibson, Harrison and 6 more57 min
May 5, 4:18 AM CDTMesoscale DiscussionSPCAllen, Ballard, Barren, Butler, Caldwell, Calloway and 19 more57 min
May 5, 4:55 AM CDTTornado WatchSPCFulton6 hr
May 5, 9:35 AM CDTTornado WatchSPCCalloway, Fulton5 hr
May 5, 11:06 AM CDTMesoscale DiscussionSPCFulton114 min
May 5, 2:13 PM CDTMesoscale DiscussionSPCFulton62 min
May 5, 2:35 PM CDTTornado WatchSPCFulton7 hr
May 5, 5:15 PM CDTTornado WatchSPCBracken, Campbell, Grant, Greenup, Kenton, Lewis and 4 more5 hr
May 5, 6:47 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Bracken, Campbell, Carter and 15 more88 min
May 4, 7:19 PM CDTMesoscale DiscussionSPCBarry, Barton, Cedar, Christian, Dade, Dallas and 18 more86 min
May 4, 9:05 PM CDTMesoscale DiscussionSPCBates, Benton, Boone, Caldwell, Carroll, Cass and 23 more85 min
May 4, 9:42 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Carter, Cedar, Christian and 28 more93 min
May 5, 12:50 AM CDTTornado WatchSPCBarry, Carter, Cedar, Christian, Dade, Dallas and 21 more5 hr
May 5, 1:05 PM CDTTornado WatchSPCDunklin3 hr
May 5, 3:25 PM CDTTornado WatchSPCDunklin, Pemiscot7 hr
May 5, 5:18 PM CDTMesoscale DiscussionSPCDunklin, Pemiscot117 min

Nearby

Tornado Watches in Illinois, 2003Tornado Watches in Missouri, 2003Tornado Watches in Kentucky, 2003Every tornado watch in 2003

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.