Alert archive / Louisiana / Tornado Watches in 2003

Tornado Watch 976

November 27, 200322 parishes in Louisiana; 7 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 27, 2003, 3:00 AM CST for 22 parishes in Louisiana; 7 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Nov 27, 2003, 3:00 AM CST (09:00 UTC)
Expired
Nov 27, 2003, 8:00 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
All 29 counties

Acadia Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Forrest County, MS, Lamar County, MS, Pearl River County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Nov 27, 4:09 AM CSTSevere Thunderstorm WarningLCHSaint Martin, St. Mary66 min
Nov 27, 4:31 AM CSTSevere Thunderstorm WarningLIXAscension, Assumption, Iberville, Saint James59 min
Nov 27, 5:22 AM CSTSevere Thunderstorm WarningLIXAssumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist53 min
Nov 27, 6:08 AM CSTSevere Thunderstorm WarningLIXJefferson, Orleans, Saint Charles, Saint John the Baptist52 min
Nov 27, 6:52 AM CSTSevere Thunderstorm WarningLIXPearl River38 min
Nov 27, 7:27 AM CSTSevere Thunderstorm WarningLIXHancock, Harrison, Pearl River63 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, 9.0 hours before the alert went out and 129 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 2003-11-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 549 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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 2003-11-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 249 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
549 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
540 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
249 m²/s²
0-3 km storm-relative helicity
305 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 270859
SEL6  
SPC WW 270900
LAZ000-MSZ000-CWZ000-271400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 976 
NWS STORM PREDICTION CENTER NORMAN OK 
300 AM CST THU NOV 27 2003

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

       SOUTH-CENTRAL AND SOUTHEASTERN LOUISIANA
       SOUTH-CENTRAL AND SOUTHWESTERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS THURSDAY MORNING FROM 300 AM UNTIL 800 AM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 35 MILES SOUTHWEST OF INTRACOASTAL CITY LOUISIANA
TO 15 MILES EAST NORTHEAST OF MC COMB MISSISSIPPI.

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 975. WATCH NUMBER 975 WILL NOT BE IN EFFECT AFTER 300
AM CST. 


DISCUSSION...SCATTERED TSTMS EXPECTED ACROSS AREA.  GREATEST
SUPERCELL/TORNADO POTENTIAL FROM LA COAST NEWD TO WARM FRONT
ANALYZED OVER SERN LA/SWRN MS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24035.


...EDWARDS/evans

292,0934 311,0913 311,0885 292,0911

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 26, 6:55 PM CSTSevere Thunderstorm WatchSPCBeauregard, Bossier, Caddo, Calcasieu, Cameron, De Soto and 4 more6 hr
Nov 26, 9:18 PM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 48 more87 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, 1:36 AM CSTMesoscale DiscussionSPCBienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 13 more2 hr
Nov 27, 2:31 AM CSTMesoscale DiscussionSPCAcadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more59 min
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

Tornado Watches in Louisiana, 2003Tornado Watches in Mississippi, 2003Every tornado 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.