Alert archive / Louisiana / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 892
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 11:37 PM CST | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron | 53 min |
| Nov 24, 12:32 AM CST | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron, Jefferson Davis | 58 min |
| Nov 24, 1:07 AM CST | Severe Thunderstorm Warning | LCH | Acadia | 53 min |
| Nov 24, 1:11 AM CST | Severe Thunderstorm Warning | LCH | Vermilion | 64 min |
| Nov 24, 1:30 AM CST | Severe Thunderstorm Warning | LCH | Lafayette | 45 min |
| Nov 24, 1:53 AM CST | Severe Thunderstorm Warning | LCH | Iberia, Saint Martin | 52 min |
| Nov 24, 2:09 AM CST | Severe Thunderstorm Warning | LCH | St. Mary | 51 min |
| Nov 24, 2:10 AM CST | Tornado Warning | LIX | Saint James, Saint John the Baptist | 35 min |
| Nov 24, 2:22 AM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana, Iberville, West Baton Rouge | 68 min |
| Nov 24, 2:53 AM CST | Tornado Warning | LIX | Saint John the Baptist, Saint Tammany, Tangipahoa | 37 min |
| Nov 24, 3:23 AM CST | Severe Thunderstorm Warning | LIX | Ascension, Assumption | 52 min |
| Nov 24, 3:24 AM CST | Tornado Warning | LIX | Saint Charles, Saint John the Baptist | 36 min |
| Nov 24, 3:40 AM CST | Tornado Warning | LIX | Ascension | 35 min |
| Nov 24, 3:58 AM CST | Severe Thunderstorm Warning | LIX | Lafourche, Saint James, Saint John the Baptist, Terrebonne | 62 min |
| Nov 24, 4:06 AM CST | Tornado Warning | LIX | Jefferson, Saint Charles | 54 min |
| Nov 24, 4:26 AM CST | Tornado Warning | LIX | Lafourche | 64 min |
| Nov 24, 4:27 AM CST | Tornado Warning | LIX | Jefferson, Orleans, Saint Bernard | 33 min |
| Nov 24, 4:55 AM CST | Tornado Warning | LIX | Orleans, Saint Tammany | 65 min |
| Nov 24, 5:00 AM CST | Tornado Warning | LIX | Jefferson | 60 min |
| Nov 24, 5:04 AM CST | Tornado Warning | LIX | Plaquemines | 56 min |
| Nov 24, 5:11 AM CST | Severe Thunderstorm Warning | LIX | Saint Bernard | 64 min |
| Nov 24, 5:34 AM CST | Severe Thunderstorm Warning | LIX | Jefferson, Lafourche | 26 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.
- 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
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 302,0934SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 23, 7:50 PM CST | Tornado Watch | SPC | Sabine | 6 hr |
| Nov 23, 7:53 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 20 more | 37 min |
| Nov 23, 8:15 PM CST | Tornado Watch | SPC | Allen, Avoyelles, Beauregard, Caldwell, Catahoula, Concordia and 21 more | 6 hr |
| Nov 23, 9:14 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Catahoula, Concordia, East Carroll and 7 more | 2 hr |
| Nov 23, 10:01 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 38 more | 119 min |
| Nov 24, 12:30 AM CST | Mesoscale Discussion | SPC | Saint Tammany, Tangipahoa, Washington | 30 min |
| Nov 24, 12:45 AM CST | Tornado Watch | SPC | Saint Helena, Tangipahoa, Washington | 5 hr |
| Nov 24, 1:28 AM CST | Mesoscale Discussion | SPC | Avoyelles, Concordia, East Baton Rouge, East Carroll, East Feliciana, Evangeline and 9 more | 32 min |
| Nov 24, 1:45 AM CST | Tornado Watch | SPC | East Baton Rouge, East Feliciana, Livingston, Pointe Coupee, Saint Helena, Saint Landry and 2 more | 4 hr |
| Nov 24, 2:43 AM CST | Mesoscale Discussion | SPC | Tangipahoa, Washington | 62 min |
| Nov 24, 2:50 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, Iberville, Jefferson, Lafourche and 11 more | 3 hr |
| Nov 24, 5:35 AM CST | Mesoscale Discussion | SPC | Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard | 25 min |
| Nov 24, 5:55 AM CST | Tornado Watch | SPC | Plaquemines, Saint Bernard | 2 hr |
| Nov 23, 6:23 PM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Bastrop, Bell, Brazos, Burleson and 23 more | 2 hr |
| Nov 23, 7:17 PM CST | Mesoscale Discussion | SPC | Angelina, Austin, Brazoria, Calhoun, Chambers, Cherokee and 35 more | 58 min |
| Nov 23, 7:31 PM CST | Mesoscale Discussion | SPC | Carson, Hansford, Hutchinson, Lipscomb, Moore, Ochiltree and 3 more | 5 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.