Alert archive / Louisiana / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 364

May 13, 200321 parishes in Louisiana; 8 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 13, 2003, 8:30 PM CDT for 21 parishes in Louisiana; 8 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 13, 2003, 8:30 PM CDT (01:30 UTC)
Expired
May 14, 2003, 1:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 29 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto 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, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Gregg County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 22 km from the middle of the area, began a volume at 01:30 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

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

IssuedProductOfficeCountiesLasted
May 13, 9:34 PM CDTTornado WarningSHVWebster26 min
May 13, 9:44 PM CDTTornado WarningSHVClaiborne61 min
May 13, 9:48 PM CDTSevere Thunderstorm WarningSHVCaddo42 min
May 13, 10:05 PM CDTTornado WarningSHVCaddo40 min
May 13, 10:20 PM CDTSevere Thunderstorm WarningSHVWebster40 min
May 13, 10:24 PM CDTSevere Thunderstorm WarningSHVUnion51 min
May 13, 10:35 PM CDTSevere Thunderstorm WarningSHVBienville, Lincoln55 min
May 13, 10:44 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo, Claiborne61 min
May 13, 11:08 PM CDTTornado WarningSHVBossier, Caddo52 min
May 13, 11:08 PM CDTTornado WarningSHVBienville67 min
May 13, 11:11 PM CDTSevere Thunderstorm WarningSHVJackson64 min
May 13, 11:19 PM CDTTornado WarningSHVJackson56 min
May 13, 11:28 PM CDTSevere Thunderstorm WarningSHVWebster62 min
May 13, 11:48 PM CDTSevere Thunderstorm WarningSHVBienville57 min
May 14, 12:00 AM CDTTornado WarningSHVCaddo, De Soto, Red River60 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 00:00Z, 1.5 hours before the alert went out and 18 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 00:00Z on 2003-05-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2326 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2003-05-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
2326 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
1006 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
401 m²/s²
Significant tornado parameter
3.2
Supercell composite
18.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 13, 8:05 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 2 more55 min
May 13, 10:45 PM CDTTornado WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more5 hr
May 14, 10:55 AM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, Webster2 hr
May 14, 2:30 PM CDTTornado WatchSPCBossier, Caddo, Claiborne, Lincoln, Ouachita, Union and 1 more6 hr
May 14, 5:17 PM CDTMesoscale DiscussionSPCBossier, Claiborne, Jackson, Lincoln, Union, Webster118 min
May 14, 6:10 PM CDTSevere Thunderstorm WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, East Carroll and 13 more6 hr
May 14, 3:49 AM CDTMesoscale DiscussionSPCFannin, Lamar, Red River116 min
May 14, 4:05 AM CDTSevere Thunderstorm WatchSPCCollin, Cooke, Delta, Denton, Fannin, Grayson and 3 more5 hr
May 14, 5:50 AM CDTMesoscale DiscussionSPCBowie, Camp, Cass, Cooke, Delta, Fannin and 8 more115 min
May 14, 7:40 AM CDTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Delta, Denton and 7 more95 min
May 14, 3:23 PM CDTMesoscale DiscussionSPCArcher, Baylor, Bosque, Brown, Callahan, Clay and 24 more2 hr
May 14, 6:28 PM CDTMesoscale DiscussionSPCArmstrong, Baylor, Briscoe, Carson, Childress, Collingsworth and 25 more2 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2003Severe Thunderstorm Watches in Texas, 2003Every severe thunderstorm 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.