Alert archive / Missouri / Tornado Watches in 2003

Tornado Watch 344

May 10, 200327 counties in Illinois; 38 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 10, 2003, 5:40 PM CDT for 27 counties in Illinois; 38 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2003, 5:40 PM CDT (22:40 UTC)
Expired
May 10, 2003, 11:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 65 counties

Adams County, IL, Bond County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Christian County, IL, Clinton County, IL, DeWitt County, IL, Greene County, IL, Hancock County, IL, Jersey County, IL, Logan County, IL, Macon County, IL, Macoupin County, IL, Madison County, IL, Mason County, IL, McDonough County, IL, Menard County, IL, Monroe County, IL, Montgomery County, IL, Morgan County, IL, Piatt County, IL, Pike County, IL, Saint Clair County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Adair County, MO, Audrain County, MO, Benton County, MO, Boone County, MO, Callaway County, MO, Chariton County, MO, City of Saint Louis, MO, Clark County, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Henry County, MO, Howard County, MO, Jefferson County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Linn County, MO, Macon County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pettis County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Saline County, MO, Scotland County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 105 km from the middle of the area, began a volume at 22:43 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 10, 5:42 PM CDTTornado WarningLSXBoone, Moniteau48 min
May 10, 5:44 PM CDTTornado WarningEAXCooper46 min
May 10, 5:44 PM CDTTornado WarningLSXKnox, Lewis31 min
May 10, 5:47 PM CDTTornado WarningLSXLewis, Marion43 min
May 10, 5:56 PM CDTTornado WarningDVNClark34 min
May 10, 5:58 PM CDTTornado WarningEAXRandolph32 min
May 10, 6:04 PM CDTSevere Thunderstorm WarningLSXShelby41 min
May 10, 6:13 PM CDTTornado WarningEAXHenry47 min
May 10, 6:13 PM CDTTornado WarningLSXMarion, Monroe, Ralls47 min
May 10, 6:21 PM CDTTornado WarningLSXAdams39 min
May 10, 6:28 PM CDTTornado WarningLSXLewis47 min
May 10, 6:29 PM CDTSevere Thunderstorm WarningLSXAudrain, Boone61 min
May 10, 6:30 PM CDTSevere Thunderstorm WarningEAXSaline45 min
May 10, 6:37 PM CDTTornado WarningDVNHancock23 min
May 10, 6:39 PM CDTSevere Thunderstorm WarningLSXFranklin66 min
May 10, 6:52 PM CDTSevere Thunderstorm WarningEAXChariton38 min
May 10, 6:53 PM CDTTornado WarningLSXAdams52 min
May 10, 6:59 PM CDTTornado WarningDVNHancock31 min
May 10, 7:12 PM CDTSevere Thunderstorm WarningEAXMacon63 min
May 10, 7:22 PM CDTSevere Thunderstorm WarningLSXJefferson38 min
May 10, 7:23 PM CDTSevere Thunderstorm WarningLSXKnox, Shelby52 min
May 10, 7:29 PM CDTTornado WarningDVNHancock, McDonough46 min
May 10, 7:29 PM CDTTornado WarningLSXKnox46 min
May 10, 7:30 PM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair45 min
May 10, 7:36 PM CDTTornado WarningLSXBrown39 min
May 10, 7:38 PM CDTTornado WarningILXSchuyler52 min
May 10, 7:43 PM CDTTornado WarningLSXAdams17 min
May 10, 8:15 PM CDTTornado WarningLSXBrown15 min
May 10, 8:25 PM CDTTornado WarningILXSchuyler50 min
May 10, 8:32 PM CDTSevere Thunderstorm WarningLSXAudrain43 min
May 10, 8:45 PM CDTTornado WarningILXFulton, Mason60 min
May 10, 9:29 PM CDTSevere Thunderstorm WarningILXSchuyler61 min
May 10, 9:30 PM CDTSevere Thunderstorm WarningILXSchuyler60 min
May 10, 9:45 PM CDTTornado WarningILXMason, Tazewell60 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

Springfield, MO (KSGF), launched 12:00Z, 10.7 hours before the alert went out and 297 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, Springfield, MO at 12:00Z on 2003-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1867 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2003-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 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
1867 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
689 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
300 m²/s²
Significant tornado parameter
3.5
Supercell composite
12.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 102236
SEL4  
SPC WW 102240
ILZ000-MOZ000-110400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 344 
NWS STORM PREDICTION CENTER NORMAN OK 
540 PM CDT SAT MAY 10 2003

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

       CENTRAL ILLINOIS
       CENTRAL AND EASTERN MISSOURI

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 540 PM UNTIL
1100 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 80 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 50 MILES NORTHEAST OF QUINCY ILLINOIS TO 35
MILES SOUTH SOUTHEAST OF JEFFERSON CITY 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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 337. WATCH NUMBER 337 WILL NOT BE IN EFFECT AFTER 540
PM CDT. CONTINUE...WW 337...WW 338...WW 340...WW 341...WW 342...WW
343...


DISCUSSION...STRONG CYCLOGENESIS  IS UNDERWAY INTO NRN MO/ERN IA AS
VIGOROUS UPPER TROUGH SHIFTS TOWARDS AREA.  CONDITIONS ARE PRIMED
FOR LONGED LIVED TORNADIC SUPERCELLS AHEAD OF DRY LINE. ADDITIONALLY
ALONG DRY LINE SEVERE THUNDERSTORMS ARE REDEVELOPING RAPIDLY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 26040.


...HALES

402,0881 380,0894 380,0940 402,0924

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 7:47 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott88 min
May 9, 8:40 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clinton, Coles and 18 more2 hr
May 9, 10:04 PM CDTMesoscale DiscussionSPCAdams26 min
May 9, 10:40 PM CDTSevere Thunderstorm WatchSPCBrown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more5 hr
May 10, 5:43 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Fulton and 15 more92 min
May 10, 5:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more5 hr
May 10, 8:30 AM CDTTornado WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more6 hr
May 10, 9:25 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more2 hr
May 10, 10:39 AM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 5 more2 hr
May 10, 10:54 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 69 more66 min
May 10, 12:38 PM CDTMesoscale DiscussionSPCClay, Crawford, Jasper, Lawrence, Richland97 min
May 10, 3:17 PM CDTMesoscale DiscussionSPCHancock, Henderson, Mercer, Rock Island58 min
May 10, 3:50 PM CDTTornado WatchSPCBureau, Carroll, Fulton, Henderson, Henry, Jo Daviess and 14 more6 hr
May 10, 4:00 PM CDTTornado WatchSPCFranklin, Jackson, Perry, Randolph, Union5 hr
May 10, 4:48 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more87 min
May 10, 6:41 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 14 more64 min
May 9, 11:00 PM CDTSevere Thunderstorm WatchSPCAdair, Barton, Bates, Benton, Caldwell, Carroll and 36 more6 hr
May 10, 1:15 AM CDTSevere Thunderstorm WatchSPCAndrew5 hr
May 10, 1:22 AM CDTMesoscale DiscussionSPCNewton83 min
May 10, 2:28 AM CDTMesoscale DiscussionSPCAndrew, Buchanan92 min
May 10, 3:05 AM CDTTornado WatchSPCBarton, Bates, Benton, Cedar, Dade, Henry and 7 more5 hr
May 10, 3:15 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more5 hr
May 10, 5:27 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 9 more93 min
May 10, 7:06 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more54 min
May 10, 10:58 AM CDTMesoscale DiscussionSPCAdair, Andrew, Audrain, Barton, Bates, Benton and 42 more2 hr
May 10, 11:35 AM CDTTornado WatchSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more7 hr
May 10, 11:55 AM CDTTornado WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 13 more7 hr
May 10, 1:42 PM CDTMesoscale DiscussionSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more2 hr
May 10, 1:59 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Cedar, Christian, Dade and 12 more2 hr
May 10, 3:30 PM CDTMesoscale DiscussionSPCCrawford, Dent, Douglas, Franklin, Gasconade, Howell and 16 more2 hr

Nearby

Tornado Watches in Missouri, 2003Tornado Watches in Illinois, 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; radar from the NEXRAD Level II archive.