Alert archive / Louisiana / Tornado Watches in 2004

Tornado Watch 124

April 29, 20044 states

The Storm Prediction Center issued this tornado watch at Apr 29, 2004, 1:10 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 29, 2004, 1:10 PM CDT (18:10 UTC)
Expired
Apr 29, 2004, 7:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 35 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Drew County, AR, Union County, AR, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto 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, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Sharkey County, MS, Sunflower County, MS, Washington County, MS, Shelby County, TX

The radar

The Shreveport radar (KSHV), 108 km from the middle of the area, began a volume at 18:12 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

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

IssuedProductOfficeCountiesLasted
Apr 29, 1:12 PM CDTSevere Thunderstorm WarningSHVWebster33 min
Apr 29, 1:26 PM CDTSevere Thunderstorm WarningSHVClaiborne64 min
Apr 29, 1:47 PM CDTTornado WarningLZKCalhoun38 min
Apr 29, 1:51 PM CDTSevere Thunderstorm WarningSHVDe Soto54 min
Apr 29, 2:14 PM CDTTornado WarningLZKBradley61 min
Apr 29, 2:51 PM CDTSevere Thunderstorm WarningSHVLincoln24 min
Apr 29, 3:00 PM CDTSevere Thunderstorm WarningJANMorehouse45 min
Apr 29, 3:08 PM CDTTornado WarningJANAshley47 min
Apr 29, 3:09 PM CDTSevere Thunderstorm WarningSHVUnion36 min
Apr 29, 3:13 PM CDTSevere Thunderstorm WarningSHVRed River32 min
Apr 29, 3:28 PM CDTSevere Thunderstorm WarningSHVNatchitoches62 min
Apr 29, 3:39 PM CDTSevere Thunderstorm WarningJANWest Carroll46 min
Apr 29, 3:47 PM CDTTornado WarningJANWest Carroll43 min
Apr 29, 4:01 PM CDTSevere Thunderstorm WarningSHVCaldwell44 min
Apr 29, 4:01 PM CDTSevere Thunderstorm WarningSHVWinn59 min
Apr 29, 4:18 PM CDTSevere Thunderstorm WarningJANEast Carroll47 min
Apr 29, 4:39 PM CDTSevere Thunderstorm WarningJANFranklin, Richland61 min
Apr 29, 4:41 PM CDTSevere Thunderstorm WarningSHVCaldwell64 min
Apr 29, 4:44 PM CDTSevere Thunderstorm WarningJANIssaquena46 min
Apr 29, 4:56 PM CDTTornado WarningJANFranklin39 min
Apr 29, 4:57 PM CDTSevere Thunderstorm WarningSHVWinn18 min
Apr 29, 5:10 PM CDTTornado WarningJANMadison75 min
Apr 29, 5:12 PM CDTSevere Thunderstorm WarningJANSharkey43 min
Apr 29, 5:32 PM CDTTornado WarningJANSharkey43 min
Apr 29, 5:47 PM CDTTornado WarningJANHumphreys58 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

Shreveport, LA (KSHV), launched 12:00Z, 6.2 hours before the alert went out and 99 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, Shreveport, LA at 12:00Z on 2004-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Shreveport, LA at 12:00Z on 2004-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 250 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1349 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
250 m²/s²
0-3 km storm-relative helicity
281 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 291809
SEL4  
SPC WW 291810
ARZ000-LAZ000-MSZ000-TXZ000-300000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 124
NWS STORM PREDICTION CENTER NORMAN OK
110 PM CDT THU APR 29 2004

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

       SOUTHEASTERN ARKANSAS
       NORTHERN LOUISIANA
       WEST CENTRAL MISSISSIPPI
       EAST CENTRAL TEXAS

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 110 PM UNTIL
700 PM CDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 20 MILES NORTH OF GREENVILLE MISSISSIPPI TO 65
MILES WEST 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.

DISCUSSION...STORMS ARE EXPECTED TO CONTINUE TO INTENSIFY AHEAD OF
VORT MOVING THROUGH THE LOWER MS VALLEY AS THE ATMOSPHERE
DESTABILIZES THIS AFTERNOON. SUPERCELLS WITH ISOLATED TORNADOES AND
DAMAGING WIND GUSTS WILL BE THE MAIN THREATS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25035.


...DIAL/HART

334,0893 312,0920 312,0944 334,0922

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 29, 11:22 AM CDTMesoscale DiscussionSPCAshley, Bradley, Union113 min
Apr 29, 2:44 PM CDTMesoscale DiscussionSPCAshley, Chicot, Drew2 hr
Apr 29, 5:36 PM CDTMesoscale DiscussionSPCChicot84 min
Apr 29, 1:56 PM CDTMesoscale DiscussionSPCAscension, Assumption, Avoyelles, Concordia, East Baton Rouge, East Feliciana and 23 more2 hr
Apr 29, 3:15 PM CDTTornado WatchSPCPlaquemines, Saint Bernard6 hr
Apr 29, 6:15 PM CDTMesoscale DiscussionSPCOrleans, Saint Bernard, Saint Tammany90 min
Apr 29, 6:55 PM CDTTornado WatchSPCAttala, Carroll, Choctaw, Hinds, Holmes, Leake and 5 more3 hr
Apr 28, 7:07 PM CDTMesoscale DiscussionSPCBandera, Dimmit, Edwards, Frio, Kerr, Kinney and 8 more83 min
Apr 28, 7:25 PM CDTSevere Thunderstorm WatchSPCBandera, Brooks, Crockett, Dimmit, Duval, Edwards and 17 more6 hr
Apr 28, 9:56 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Brooks, Dimmit, Duval, Edwards and 12 more94 min
Apr 29, 4:12 AM CDTMesoscale DiscussionSPCAustin, Bastrop, Brazos, Burleson, Colorado, DeWitt and 18 more3 hr
Apr 29, 1:49 PM CDTMesoscale DiscussionSPCBaylor, Childress, Collingsworth, Cottle, Foard, Hall and 4 more116 min
Apr 29, 3:05 PM CDTSevere Thunderstorm WatchSPCChildress, Collingsworth, Cottle, Crosby, Dickens, Foard and 7 more7 hr
Apr 29, 3:58 PM CDTMesoscale DiscussionSPCBorden, Coke, Crockett, Fisher, Glasscock, Howard and 15 more2 hr
Apr 29, 5:10 PM CDTMesoscale DiscussionSPCArcher, Baylor, Callahan, Clay, Coke, Coleman and 18 more95 min
Apr 29, 5:35 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Callahan, Clay, Fisher, Haskell and 10 more5 hr
Apr 29, 6:35 PM CDTMesoscale DiscussionSPCChildress, Collingsworth, Cottle, Crosby, Dickens, Foard and 7 more85 min

Nearby

Tornado Watches in Louisiana, 2004Tornado Watches in Arkansas, 2004Tornado Watches in Mississippi, 2004Every tornado watch in 2004

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.