Alert archive / Texas / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 48

April 7, 20046 parishes in Louisiana; 28 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2004, 2:45 PM CDT for 6 parishes in Louisiana; 28 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 7, 2004, 2:45 PM CDT (19:45 UTC)
Expired
Apr 7, 2004, 8:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 34 counties

Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Red River Parish, LA, Webster Parish, LA, Anderson County, TX, Angelina County, TX, Brazos County, TX, Camp County, TX, Cherokee County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Leon County, TX, Madison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 169 km from the middle of the area, began a volume at 19:47 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

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

IssuedProductOfficeCountiesLasted
Apr 7, 4:14 PM CDTSevere Thunderstorm WarningSHVGregg31 min
Apr 7, 4:24 PM CDTSevere Thunderstorm WarningFWDAnderson36 min
Apr 7, 4:30 PM CDTSevere Thunderstorm WarningFWDAnderson30 min
Apr 7, 4:31 PM CDTSevere Thunderstorm WarningHGXHouston44 min
Apr 7, 4:33 PM CDTSevere Thunderstorm WarningSHVPanola57 min
Apr 7, 4:36 PM CDTSevere Thunderstorm WarningSHVHarrison54 min
Apr 7, 4:52 PM CDTSevere Thunderstorm WarningFWDLeon38 min
Apr 7, 4:53 PM CDTSevere Thunderstorm WarningSHVRusk67 min
Apr 7, 5:06 PM CDTSevere Thunderstorm WarningSHVCherokee54 min
Apr 7, 5:15 PM CDTSevere Thunderstorm WarningHGXHouston15 min
Apr 7, 5:16 PM CDTSevere Thunderstorm WarningHGXMadison44 min
Apr 7, 5:22 PM CDTSevere Thunderstorm WarningSHVCaddo53 min
Apr 7, 5:28 PM CDTSevere Thunderstorm WarningSHVPanola62 min
Apr 7, 5:32 PM CDTSevere Thunderstorm WarningSHVHarrison28 min
Apr 7, 5:39 PM CDTSevere Thunderstorm WarningHGXTrinity51 min
Apr 7, 5:39 PM CDTSevere Thunderstorm WarningSHVAngelina66 min
Apr 7, 5:43 PM CDTSevere Thunderstorm WarningSHVDe Soto47 min
Apr 7, 5:55 PM CDTSevere Thunderstorm WarningHGXWalker35 min
Apr 7, 6:07 PM CDTSevere Thunderstorm WarningHGXHouston23 min
Apr 7, 6:12 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo63 min
Apr 7, 6:21 PM CDTSevere Thunderstorm WarningSHVDe Soto39 min
Apr 7, 6:27 PM CDTSevere Thunderstorm WarningHGXTrinity33 min
Apr 7, 6:35 PM CDTSevere Thunderstorm WarningHGXPolk55 min
Apr 7, 6:42 PM CDTSevere Thunderstorm WarningSHVAngelina63 min
Apr 7, 6:55 PM CDTSevere Thunderstorm WarningSHVDe Soto, Red River50 min
Apr 7, 6:56 PM CDTSevere Thunderstorm WarningSHVWebster64 min
Apr 7, 7:00 PM CDTSevere Thunderstorm WarningSHVShelby45 min
Apr 7, 7:22 PM CDTSevere Thunderstorm WarningSHVBossier53 min
Apr 7, 7:36 PM CDTSevere Thunderstorm WarningLCHTyler39 min
Apr 7, 7:56 PM CDTSevere Thunderstorm WarningSHVSan Augustine64 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, 7.8 hours before the alert went out and 178 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 2004-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 138 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, Shreveport, LA at 12:00Z on 2004-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
138 J/kg
Mixed-layer CIN
-64 J/kg
Mixed-layer LCL
766 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 7, 12:58 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more2 hr
Apr 7, 5:06 PM CDTMesoscale DiscussionSPCPlaquemines, Saint Bernard114 min
Apr 7, 6:08 PM CDTMesoscale DiscussionSPCAllen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 27 more67 min
Apr 6, 8:21 PM CDTMesoscale DiscussionSPCCollin, Dallas, Denton, Ellis, Henderson, Hill and 12 more2 hr
Apr 7, 3:05 PM CDTSevere Thunderstorm WatchSPCBowie, Delta, Franklin, Hopkins, Lamar, Red River and 1 more5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2004Severe Thunderstorm Watches in Louisiana, 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; radar from the NEXRAD Level II archive.