Alert archive / Texas / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 974

November 26, 20034 counties in Arkansas; 10 parishes in Louisiana; 52 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Nov 26, 2003, 6:55 PM CST for 4 counties in Arkansas; 10 parishes in Louisiana; 52 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Nov 26, 2003, 6:55 PM CST (00:55 UTC)
Expired
Nov 27, 2003, 1:00 AM CST
In force
6 hr
Issued by
the Storm Prediction Center
All 66 counties

Columbia County, AR, Lafayette County, AR, Miller County, AR, Nevada County, AR, Beauregard Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Webster Parish, LA, Anderson County, TX, Angelina County, TX, Bowie County, TX, Brazoria County, TX, Camp County, TX, Cass County, TX, Chambers County, TX, Cherokee County, TX, Delta County, TX, Fannin County, TX, Fort Bend County, TX, Franklin County, TX, Galveston County, TX, Gregg County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Harrison County, TX, Henderson County, TX, Hopkins County, TX, Houston County, TX, Hunt County, TX, Jasper County, TX, Jefferson County, TX, Lamar County, TX, Leon County, TX, Liberty County, TX, Madison County, TX, Marion County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Panola County, TX, Polk County, TX, Rains County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Van Zandt County, TX, Walker County, TX, Waller County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 87 km from the middle of the area, began a volume at 00:56 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

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

IssuedProductOfficeCountiesLasted
Nov 26, 7:49 PM CSTSevere Thunderstorm WarningSHVSabine26 min
Nov 26, 9:46 PM CSTTornado WarningLCHBeauregard29 min
Nov 26, 10:17 PM CSTTornado WarningLCHBeauregard, Vernon28 min
Nov 26, 11:24 PM CSTTornado WarningLCHBeauregard36 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, 0.9 hours before the alert went out and 94 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 2003-11-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 228 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 00:00Z on 2003-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 245 square meters per square second.1939587897117Sfc1 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
228 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
742 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
245 m²/s²
0-3 km storm-relative helicity
282 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.8

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 26, 9:18 PM CSTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Columbia, Drew and 5 more87 min
Nov 27, 1:36 AM CSTMesoscale DiscussionSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 28 more2 hr
Nov 27, 11:36 AM CSTMesoscale DiscussionSPCArkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 38 more114 min
Nov 26, 9:55 PM CSTTornado WatchSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more5 hr
Nov 26, 11:41 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 18 more94 min
Nov 27, 2:31 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more59 min
Nov 27, 3:00 AM CSTTornado WatchSPCAcadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more5 hr
Nov 27, 5:03 AM CSTMesoscale DiscussionSPCAcadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more117 min
Nov 27, 5:25 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 11 more6 hr
Nov 27, 7:48 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more117 min
Nov 27, 7:49 AM CSTMesoscale DiscussionSPCAcadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 2 more2 hr
Nov 27, 9:53 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more2 hr

Nearby

Severe Thunderstorm Watches in Texas, 2003Severe Thunderstorm Watches in Louisiana, 2003Severe Thunderstorm Watches in Arkansas, 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.