Alert archive / Texas / Tornado Watches in 2004

Tornado Watch 884

November 23, 200411 parishes in Louisiana; 31 counties in Texas

The Storm Prediction Center issued this tornado watch at Nov 23, 2004, 9:45 AM CST for 11 parishes in Louisiana; 31 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Nov 23, 2004, 9:45 AM CST (15:45 UTC)
Expired
Nov 23, 2004, 3:00 PM CST
In force
5 hr
Issued by
the Storm Prediction Center
All 42 counties

Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, De Soto Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 15:47 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

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

IssuedProductOfficeCountiesLasted
Nov 23, 9:52 AM CSTSevere Thunderstorm WarningHGXGalveston38 min
Nov 23, 11:19 AM CSTTornado WarningHGXChambers, Galveston26 min
Nov 23, 1:07 PM CSTTornado WarningHGXMontgomery, San Jacinto38 min
Nov 23, 1:46 PM CSTTornado WarningHGXAustin, Polk, San Jacinto, Washington44 min
Nov 23, 1:53 PM CSTFlash Flood WarningHGXTrinity3 hr
Nov 23, 2:37 PM CSTTornado WarningHGXChambers, Harris, Liberty38 min
Nov 23, 2:46 PM CSTTornado WarningHGXTrinity29 min
Nov 23, 2:56 PM CSTTornado WarningHGXWaller34 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 12:00Z, 3.8 hours before the alert went out and 205 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 12:00Z on 2004-11-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 534 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 12:00Z on 2004-11-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 168 square meters per square second.1939587897Sfc1 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
534 J/kg
Mixed-layer CIN
-154 J/kg
Mixed-layer LCL
1172 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
168 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.3

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 231543
SEL4  
SPC WW 231545
LAZ000-TXZ000-CWZ000-232100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 884
NWS STORM PREDICTION CENTER NORMAN OK
945 AM CST TUE NOV 23 2004

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

       WESTERN AND CENTRAL LOUISIANA
       SOUTHEAST TEXAS
       COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 945 AM UNTIL 300
PM CST.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 90 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES SOUTH OF PALACIOS TEXAS TO 65 MILES
NORTHWEST 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.

OTHER WATCH INFORMATION...CONTINUE...WW 883...

DISCUSSION...WITH  AIR MASS BECOMING VERY UNSTABLE SERN TX/SWRN
LA...COUPLED WITH INCREASINGLY FAVORABLE DEEP LAYER SHEAR AHEAD OF
STRONG TROUGH...SUPERCELL THUNDERSTORMS EXPECTED TO DEVELOP ACROSS
WATCH AREA NEXT SEVERAL HOURS. ASSOCIATED TORNADO POTENTIAL WILL
INCREASE  THRU THE AFTERNOON HOURS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 24040.


...HALES

280,0974 320,0943 320,0913 280,0944

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 22, 6:03 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 26 more2 hr
Nov 23, 11:10 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, Madison, Tensas3 hr
Nov 23, 11:38 AM CSTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Grant, LaSalle, Natchitoches and 4 more2 hr
Nov 23, 12:48 PM CSTMesoscale DiscussionSPCBossier, Caddo, De Soto, Grant, Natchitoches, Sabine and 1 more117 min
Nov 23, 2:00 PM CSTTornado WatchSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more7 hr
Nov 23, 3:21 PM CSTMesoscale DiscussionSPCAllen, Beauregard, Bienville, Bossier, Caddo, Calcasieu and 19 more114 min
Nov 23, 5:30 PM CSTMesoscale DiscussionSPCBeauregard, Caldwell, Catahoula, Franklin, Grant, Jackson and 7 more2 hr
Nov 22, 10:30 PM CSTMesoscale DiscussionSPCBorden, Coke, Crockett, Dawson, Fisher, Garza and 21 more2 hr
Nov 22, 11:00 PM CSTTornado WatchSPCAndrews, Borden, Coke, Crane, Crockett, Dawson and 22 more6 hr
Nov 23, 2:58 AM CSTMesoscale DiscussionSPCBorden, Coke, Crockett, Fisher, Glasscock, Howard and 11 more92 min
Nov 23, 4:10 AM CSTSevere Thunderstorm WatchSPCBrown, Callahan, Coke, Coleman, Comanche, Concho and 19 more5 hr
Nov 23, 7:06 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Austin, Bastrop, Bell, Blanco and 46 more84 min
Nov 23, 7:19 AM CSTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Denton and 13 more86 min
Nov 23, 7:40 AM CSTMesoscale DiscussionSPCDallam6 hr
Nov 23, 8:45 AM CSTTornado WatchSPCAnderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more6 hr
Nov 23, 9:15 AM CSTMesoscale DiscussionSPCCollin, Dallas, Delta, Denton, Fannin, Grayson and 5 more3 hr
Nov 23, 10:37 AM CSTMesoscale DiscussionSPCAnderson, Austin, Bastrop, Bell, Blanco, Brazos and 47 more113 min
Nov 23, 12:15 PM CSTMesoscale DiscussionSPCCarson, Dallam, Hansford, Hartley, Hutchinson, Moore and 3 more5 hr
Nov 23, 12:16 PM CSTMesoscale DiscussionSPCBosque, Brown, Coke, Coleman, Concho, Coryell and 22 more2 hr
Nov 23, 2:14 PM CSTMesoscale DiscussionSPCBriscoe, Childress, Cottle, Crosby, Dickens, Fisher and 20 more3 hr
Nov 23, 3:15 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bexar, Blanco, Bosque, Brown and 40 more5 hr
Nov 23, 5:30 PM CSTSevere Thunderstorm WatchSPCAtascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 64 more6 hr

Nearby

Tornado Watches in Texas, 2004Tornado Watches in Louisiana, 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.