Alert archive / Louisiana / Tornado Watches in 2003

Tornado Watch 157

April 24, 2003Ashley County, Chicot County, Arkansas; 20 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Apr 24, 2003, 2:05 PM CDT for Ashley County, Chicot County, Arkansas; 20 parishes in Louisiana; 16 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 24, 2003, 2:05 PM CDT (19:05 UTC)
Expired
Apr 24, 2003, 8:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 38 counties

Ashley County, AR, Chicot County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Carroll County, MS, Claiborne County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Leflore County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Sunflower County, MS, Tallahatchie County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 24, 2:24 PM CDTTornado WarningJANAshley46 min
Apr 24, 2:28 PM CDTSevere Thunderstorm WarningJANRichland47 min
Apr 24, 2:31 PM CDTSevere Thunderstorm WarningJANChicot44 min
Apr 24, 2:45 PM CDTSevere Thunderstorm WarningJANWashington45 min
Apr 24, 3:00 PM CDTFlash Flood WarningJANLeake, Madison3 hr
Apr 24, 3:08 PM CDTSevere Thunderstorm WarningSHVOuachita37 min
Apr 24, 3:32 PM CDTTornado WarningJANMorehouse, Richland43 min
Apr 24, 3:38 PM CDTSevere Thunderstorm WarningJANLeake, Madison42 min
Apr 24, 4:02 PM CDTTornado WarningJANWest Carroll43 min
Apr 24, 4:25 PM CDTTornado WarningJANEast Carroll45 min
Apr 24, 4:59 PM CDTTornado WarningJANIssaquena, Sharkey41 min
Apr 24, 5:36 PM CDTTornado WarningJANHumphreys, Sharkey44 min
Apr 24, 5:54 PM CDTTornado WarningJANHinds, Madison41 min
Apr 24, 6:30 PM CDTFlash Flood WarningJANHinds, Kemper, Lauderdale, Leake, Madison, Neshoba and 5 more2 hr
Apr 24, 6:46 PM CDTSevere Thunderstorm WarningJANConcordia44 min
Apr 24, 6:51 PM CDTSevere Thunderstorm WarningJANMadison, Rankin44 min
Apr 24, 7:04 PM CDTSevere Thunderstorm WarningJANJefferson46 min
Apr 24, 7:09 PM CDTSevere Thunderstorm WarningJANHolmes41 min
Apr 24, 7:26 PM CDTSevere Thunderstorm WarningJANClaiborne39 min
Apr 24, 8:00 PM CDTSevere Thunderstorm WarningJANHinds30 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

Jackson, MS (KJAN), launched 12:00Z, 7.1 hours before the alert went out and 168 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, Jackson, MS at 12:00Z on 2003-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 458 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, Jackson, MS at 12:00Z on 2003-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 297 square meters per square second.19395878Sfc1 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
458 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
297 m²/s²
0-3 km storm-relative helicity
439 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.3

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 241905
SEL7  
SPC WW 241905
LAZ000-MSZ000-250100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 157 
NWS STORM PREDICTION CENTER NORMAN OK 
205 PM CDT THU APR 24 2003

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

       NORTHEAST LOUISIANA
       WEST CENTRAL MISSISSIPPI

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 205 PM UNTIL 
800 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 25 MILES SOUTH SOUTHEAST OF GREENWOOD
MISSISSIPPI TO 55 MILES WEST NORTHWEST OF ALEXANDRIA LOUISIANA.

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 156...


DISCUSSION...A CLUSTER OF STRONG/SEVERE STORMS SHOULD EXPAND EWD
FROM NE LA TO WRN MS THE NEXT SEVERAL HOURS...WITH AN ATTENDANT
THREAT OF LARGE HAIL AND DAMAGING WINDS.  TEMPERATURES OF 75-80 AND
DEW POINTS NEAR 70 ARE RESULTING IN MLCAPE VALUES OF 2000-3000 J/KG
TO THE S OF THIS CONVECTION...AND DEEP LAYER VERTICAL SHEAR IS
SUFFICIENT FOR SUPERCELLS.  THE MOST INTENSE STORMS COULD PRODUCE
VERY LARGE HAIL AND TORNADOES. 

AVIATION...TORDADOES 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 25035.


...THOMPSON

321,0895 304,0930 323,0930 340,0895

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 11:43 PM CDTMesoscale DiscussionSPCHoward, Lafayette, Little River, Miller, Polk, Sevier2 hr
Apr 24, 2:41 AM CDTMesoscale DiscussionSPCColumbia, Lafayette, Miller, Nevada, Ouachita2 hr
Apr 24, 10:12 AM CDTMesoscale DiscussionSPCArkansas, Cleburne, Conway, Craighead, Crittenden, Cross and 20 more2 hr
Apr 24, 12:47 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 38 more3 hr
Apr 24, 1:00 PM CDTTornado WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 25 more7 hr
Apr 24, 2:46 PM CDTMesoscale DiscussionSPCChicot119 min
Apr 24, 3:25 PM CDTTornado WatchSPCBaxter, Boone, Cleburne, Conway, Faulkner, Fulton and 19 more5 hr
Apr 24, 3:28 PM CDTMesoscale DiscussionSPCArkansas, Clark, Cleburne, Cleveland, Conway, Craighead and 32 more2 hr
Apr 24, 5:52 PM CDTMesoscale DiscussionSPCArkansas, Baxter, Boone, Clay, Cleburne, Cleveland and 36 more113 min
Apr 24, 6:35 PM CDTTornado WatchSPCArkansas, Baxter, Clay, Cleburne, Cleveland, Conway and 33 more5 hr
Apr 24, 6:49 PM CDTMesoscale DiscussionSPCChicot56 min
Apr 24, 6:30 AM CDTSevere Thunderstorm WatchSPCAvoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more5 hr
Apr 24, 6:40 AM CDTSevere Thunderstorm WatchSPCAvoyelles, Beauregard, Bienville, Caldwell, Catahoula, Concordia and 17 more4 hr
Apr 24, 9:39 AM CDTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, Grant, LaSalle, Tensas and 1 more2 hr
Apr 24, 11:40 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Concordia and 10 more65 min
Apr 24, 5:17 PM CDTMesoscale DiscussionSPCOrleans, Saint Tammany, Washington118 min

Nearby

Tornado Watches in Louisiana, 2003Tornado Watches in Mississippi, 2003Tornado Watches in Arkansas, 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.