Alert archive / Louisiana / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 52

April 7, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2004, 7:20 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2004, 7:20 PM CDT (00:20 UTC)
Expired
Apr 8, 2004, 1:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 34 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Drew County, AR, Union County, AR, Allen Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, East Carroll Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Vernon Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Washington County, MS, Jasper County, TX, Newton County, TX, Sabine County, TX

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 7, 7:38 PM CDTSevere Thunderstorm WarningLZKBradley42 min
Apr 7, 7:51 PM CDTSevere Thunderstorm WarningSHVSabine54 min
Apr 7, 8:04 PM CDTSevere Thunderstorm WarningSHVColumbia, Union56 min
Apr 7, 8:17 PM CDTSevere Thunderstorm WarningSHVSabine58 min
Apr 7, 9:05 PM CDTSevere Thunderstorm WarningSHVCaldwell40 min
Apr 7, 9:11 PM CDTSevere Thunderstorm WarningSHVWinn64 min
Apr 7, 9:17 PM CDTSevere Thunderstorm WarningSHVLaSalle43 min
Apr 7, 9:25 PM CDTSevere Thunderstorm WarningJANCatahoula, Franklin45 min
Apr 7, 9:30 PM CDTSevere Thunderstorm WarningJANChicot45 min
Apr 7, 9:48 PM CDTSevere Thunderstorm WarningJANWashington47 min
Apr 7, 10:37 PM CDTSevere Thunderstorm WarningJANWashington28 min
Apr 7, 11:16 PM CDTSevere Thunderstorm WarningLCHJasper, Newton24 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.3 hours before the alert went out and 184 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, Lake Charles Mun, LA at 00:00Z on 2004-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 825 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, Lake Charles Mun, LA at 00:00Z on 2004-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
825 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1551 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 9:59 PM CDTMesoscale DiscussionSPCAshley, Chicot, Drew61 min
Apr 7, 11:43 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Catahoula, Concordia, East Feliciana and 5 more62 min
Apr 7, 8:22 PM CDTMesoscale DiscussionSPCAttala, Bolivar, Carroll, Choctaw, Clay, Grenada and 21 more53 min
Apr 8, 1:31 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Castro, Cochran, Dawson, Deaf Smith and 14 more119 min
Apr 8, 2:00 PM CDTSevere Thunderstorm WatchSPCBailey, Castro, Cochran, Deaf Smith, Gaines, Hockley and 7 more6 hr
Apr 8, 4:44 PM CDTMesoscale DiscussionSPCAndrews, Bailey, Castro, Cochran, Deaf Smith, Gaines and 8 more91 min
Apr 8, 5:45 PM CDTMesoscale DiscussionSPCBandera, Brooks, Crockett, Dimmit, Duval, Edwards and 22 more90 min
Apr 8, 6:15 PM CDTSevere Thunderstorm WatchSPCArmstrong, Briscoe, Carson, Collingsworth, Crosby, Dickens and 12 more6 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2004Severe Thunderstorm Watches in Arkansas, 2004Severe Thunderstorm Watches in Texas, 2004Every severe thunderstorm 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.