Alert archive / Louisiana / Tornado Watches in 2004
Tornado Watch 898
The Storm Prediction Center issued this tornado watch at Nov 24, 2004, 5:55 AM CST for Plaquemines Parish, Saint Bernard Parish, Louisiana; Harrison County, Jackson County, Mississippi. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 24, 2004, 5:55 AM CST (11:55 UTC)
- Expired
- Nov 24, 2004, 8:00 AM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Plaquemines Parish, LA, Saint Bernard Parish, LA, Harrison County, MS, Jackson County, MS
The radar
The Mobile radar (KMOB), 149 km from the middle of the area, began a volume at 11:59 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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 24, 5:55 AM CST | Severe Thunderstorm Warning | LIX | Harrison, Jackson | 50 min |
| Nov 24, 6:03 AM CST | Severe Thunderstorm Warning | LIX | Plaquemines | 57 min |
| Nov 24, 6:41 AM CST | Severe Thunderstorm Warning | LIX | Jackson | 49 min |
| Nov 24, 7:01 AM CST | Severe Thunderstorm Warning | LIX | Plaquemines | 29 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 11.9 hours before the alert went out and 91 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
- 866 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 118 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
229
WWUS20 KWNS 241156
SEL8
SPC WW 241155
LAZ000-MSZ000-CWZ000-241400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 898
NWS STORM PREDICTION CENTER NORMAN OK
555 AM CST WED NOV 24 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EXTREME SOUTHEAST LOUISIANA
EXTREME SOUTHERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY MORNING FROM 555 AM UNTIL 800 AM CST.
TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS ALONG AND 40 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES EAST NORTHEAST OF GULFPORT MISSISSIPPI TO
25 MILES SOUTH OF BOOTHVILLE 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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 895. WATCH NUMBER 895 WILL NOT BE IN EFFECT AFTER 555
AM CST. CONTINUE...WW 896...WW 897...
DISCUSSION...LINE OF STRONG/SEVERE THUNDERSTORMS OVER SOUTHEAST LA
WILL MOVE OFFSHORE DURING THE NEXT 2 HOURS. IN THE
MEANTIME...STRONG WINDS FIELDS AND AMPLE MOISTURE/INSTABILITY WILL
MAINTAIN A RISK OF SEVERE THUNDERSTORMS AND POSSIBLE TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25035.
...HART
303,0874 285,0884 285,0900 303,0890SPC 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 23, 11:00 PM CST | Severe Thunderstorm Watch | SPC | Acadia, Ascension, Assumption, Calcasieu, Cameron, Iberia and 15 more | 7 hr |
| 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 23, 6:35 PM CST | Tornado Watch | SPC | Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more | 7 hr |
| Nov 23, 9:00 PM CST | Mesoscale Discussion | SPC | Alcorn, Itawamba, Prentiss, Tishomingo | 2 hr |
| Nov 23, 9:20 PM CST | Tornado Watch | SPC | Itawamba, Lowndes, Monroe, Tishomingo | 7 hr |
| Nov 24, 3:35 AM CST | Mesoscale Discussion | SPC | Lowndes | 25 min |
| Nov 24, 4:57 AM CST | Mesoscale Discussion | SPC | Clarke, Forrest, George, Greene, Lamar, Pearl River and 3 more | 63 min |
| Nov 24, 5:20 AM CST | Tornado Watch | SPC | George, Jackson | 6 hr |
| Nov 24, 10:16 AM CST | Mesoscale Discussion | SPC | Alcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more | 2 hr |
Nearby
Tornado Watches in Louisiana, 2004Tornado Watches in Mississippi, 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.