Alert archive / Louisiana / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 892

November 23, 200421 parishes in Louisiana; Orange County, Texas

The Storm Prediction Center issued this severe thunderstorm watch at Nov 23, 2004, 11:00 PM CST for 21 parishes in Louisiana; Orange County, Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Nov 23, 2004, 11:00 PM CST (05:00 UTC)
Expired
Nov 24, 2004, 6:00 AM CST
In force
7 hr
Issued by
the Storm Prediction Center
All 22 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Orange County, TX

The radar

The Lake Charles radar (KLCH), 123 km from the middle of the area, began a volume at 05:02 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

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

IssuedProductOfficeCountiesLasted
Nov 23, 11:37 PM CSTSevere Thunderstorm WarningLCHCalcasieu, Cameron53 min
Nov 24, 12:32 AM CSTSevere Thunderstorm WarningLCHCalcasieu, Cameron, Jefferson Davis58 min
Nov 24, 1:07 AM CSTSevere Thunderstorm WarningLCHAcadia53 min
Nov 24, 1:11 AM CSTSevere Thunderstorm WarningLCHVermilion64 min
Nov 24, 1:30 AM CSTSevere Thunderstorm WarningLCHLafayette45 min
Nov 24, 1:53 AM CSTSevere Thunderstorm WarningLCHIberia, Saint Martin52 min
Nov 24, 2:09 AM CSTSevere Thunderstorm WarningLCHSt. Mary51 min
Nov 24, 2:10 AM CSTTornado WarningLIXSaint James, Saint John the Baptist35 min
Nov 24, 2:22 AM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, West Baton Rouge68 min
Nov 24, 2:53 AM CSTTornado WarningLIXSaint John the Baptist, Saint Tammany, Tangipahoa37 min
Nov 24, 3:23 AM CSTSevere Thunderstorm WarningLIXAscension, Assumption52 min
Nov 24, 3:24 AM CSTTornado WarningLIXSaint Charles, Saint John the Baptist36 min
Nov 24, 3:40 AM CSTTornado WarningLIXAscension35 min
Nov 24, 3:58 AM CSTSevere Thunderstorm WarningLIXLafourche, Saint James, Saint John the Baptist, Terrebonne62 min
Nov 24, 4:06 AM CSTTornado WarningLIXJefferson, Saint Charles54 min
Nov 24, 4:26 AM CSTTornado WarningLIXLafourche64 min
Nov 24, 4:27 AM CSTTornado WarningLIXJefferson, Orleans, Saint Bernard33 min
Nov 24, 4:55 AM CSTTornado WarningLIXOrleans, Saint Tammany65 min
Nov 24, 5:00 AM CSTTornado WarningLIXJefferson60 min
Nov 24, 5:04 AM CSTTornado WarningLIXPlaquemines56 min
Nov 24, 5:11 AM CSTSevere Thunderstorm WarningLIXSaint Bernard64 min
Nov 24, 5:34 AM CSTSevere Thunderstorm WarningLIXJefferson, Lafourche26 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, 5.0 hours before the alert went out and 122 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 2004-11-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1863 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 2004-11-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 177 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
1863 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
691 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
177 m²/s²
0-3 km storm-relative helicity
209 m²/s²
Significant tornado parameter
2.0
Supercell composite
8.1

Open this sounding in Storm Lab

The text

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

107 
WWUS20 KWNS 240502
SEL2  
SPC WW 240500
LAZ000-MSZ000-CWZ000-241200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 892
NWS STORM PREDICTION CENTER NORMAN OK
1100 PM CST TUE NOV 23 2004

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

       SOUTHERN LOUISIANA
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1100 PM
UNTIL 600 AM CST.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 165 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES EAST NORTHEAST OF LAFAYETTE
LOUISIANA TO 45 MILES SOUTH SOUTHEAST OF INTRACOASTAL CITY
LOUISIANA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 888...WW 889...WW 890...WW
891...

DISCUSSION...SE TX SQUALL LINE EXPECTED TO CONTINUE E INTO SRN LA AT
45-50 KTS.  DEEP WSWLY SHEAR ORIENTED AT A LARGE ANGLE TO LINE AND
RICH MOISTURE INFLOW AHEAD OF IT SHOULD SUPPORT DEVELOPMENT OF
ADDITIONAL EMBEDDED SUPERCELLS.  THESE MAY PRODUCE HIGH WIND/HAIL
AND PERHAPS A TORNADO AS STRONG SHORTWAVE TROUGH GLANCES REGION JUST
TO THE NW.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25045.


...CORFIDI

302,0881 290,0890 290,0943 302,0934

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 23, 7:50 PM CSTTornado WatchSPCSabine6 hr
Nov 23, 7:53 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more37 min
Nov 23, 8:15 PM CSTTornado WatchSPCAllen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more6 hr
Nov 23, 9:14 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more2 hr
Nov 23, 10:01 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more119 min
Nov 24, 12:30 AM CSTMesoscale DiscussionSPCSaint Tammany, Tangipahoa, Washington30 min
Nov 24, 12:45 AM CSTTornado WatchSPCSaint Helena, Tangipahoa, Washington5 hr
Nov 24, 1:28 AM CSTMesoscale DiscussionSPCAvoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Evangeline and 9 more32 min
Nov 24, 1:45 AM CSTTornado WatchSPCEast Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more4 hr
Nov 24, 2:43 AM CSTMesoscale DiscussionSPCTangipahoa, Washington62 min
Nov 24, 2:50 AM CSTTornado WatchSPCAscension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more3 hr
Nov 24, 5:35 AM CSTMesoscale DiscussionSPCJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard25 min
Nov 24, 5:55 AM CSTTornado WatchSPCPlaquemines, Saint Bernard2 hr
Nov 23, 6:23 PM CSTMesoscale DiscussionSPCAnderson, Angelina, Bastrop, Bell, Brazos, Burleson and 23 more2 hr
Nov 23, 7:17 PM CSTMesoscale DiscussionSPCAngelina, Austin, Brazoria, Calhoun, Chambers, Cherokee and 35 more58 min
Nov 23, 7:31 PM CSTMesoscale DiscussionSPCCarson, Hansford, Hutchinson, Lipscomb, Moore, Ochiltree and 3 more5 hr

Nearby

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