Alert archive / Louisiana / Tornado Watches in 2003
Tornado Watch 976
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 27, 4:09 AM CST | Severe Thunderstorm Warning | LCH | Saint Martin, St. Mary | 66 min |
| Nov 27, 4:31 AM CST | Severe Thunderstorm Warning | LIX | Ascension, Assumption, Iberville, Saint James | 59 min |
| Nov 27, 5:22 AM CST | Severe Thunderstorm Warning | LIX | Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist | 53 min |
| Nov 27, 6:08 AM CST | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Saint Charles, Saint John the Baptist | 52 min |
| Nov 27, 6:52 AM CST | Severe Thunderstorm Warning | LIX | Pearl River | 38 min |
| Nov 27, 7:27 AM CST | Severe Thunderstorm Warning | LIX | Hancock, Harrison, Pearl River | 63 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.
- 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
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 292,0911SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 26, 6:55 PM CST | Severe Thunderstorm Watch | SPC | Beauregard, Bossier, Caddo, Calcasieu, Cameron, De Soto and 4 more | 6 hr |
| Nov 26, 9:18 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 48 more | 87 min |
| Nov 26, 9:55 PM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more | 5 hr |
| Nov 26, 11:41 PM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 18 more | 94 min |
| Nov 27, 1:36 AM CST | Mesoscale Discussion | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, East Carroll and 13 more | 2 hr |
| Nov 27, 2:31 AM CST | Mesoscale Discussion | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Calcasieu and 19 more | 59 min |
| Nov 27, 5:03 AM CST | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more | 117 min |
| Nov 27, 5:25 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 11 more | 6 hr |
| Nov 27, 7:48 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more | 117 min |
| Nov 27, 7:49 AM CST | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 2 more | 2 hr |
| Nov 27, 9:53 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, East Baton Rouge, Jefferson, Lafourche, Livingston and 10 more | 2 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.