Alert archive / Louisiana / Tornado Watches in 2003
Tornado Watch 975
The Storm Prediction Center issued this tornado watch at Nov 26, 2003, 9:55 PM CST for 25 parishes in Louisiana; Amite County, Pike County, Wilkinson County, Mississippi. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 26, 2003, 9:55 PM CST (03:55 UTC)
- Expired
- Nov 27, 2003, 3:00 AM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 28 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Pike County, MS, Wilkinson County, MS
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 26, 11:08 PM CST | Tornado Warning | LCH | Rapides | 22 min |
| Nov 27, 1:54 AM CST | Severe Thunderstorm Warning | LIX | Amite, Wilkinson | 36 min |
| Nov 27, 2:36 AM CST | Severe Thunderstorm Warning | LIX | Amite | 14 min |
| Nov 27, 2:51 AM CST | Severe Thunderstorm Warning | LIX | Amite, Pike | 24 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, 3.9 hours before the alert went out and 83 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 270354
SEL5
SPC WW 270355
LAZ000-MSZ000-CWZ000-270900-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 975
NWS STORM PREDICTION CENTER NORMAN OK
955 PM CST WED NOV 26 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN LOUISIANA
SOUTHWESTERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 955 PM
UNTIL 300 AM CST.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 65 MILES NORTH NORTHWEST OF BATON ROUGE LOUISIANA
TO 40 MILES SOUTH SOUTHWEST OF INTRACOASTAL CITY 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 SEVERE
THUNDERSTORM WATCH NUMBER 974. WATCH NUMBER 974 WILL NOT BE IN
EFFECT AFTER 955 PM CST.
DISCUSSION...WIND PROFILES HAVE INCREASED AND ARE VERY FAVORABLE
FOR SUPERCELL DEVELOPMENT SRN LA AHEAD OF AREA OF THUNDERSTORMS
MOVING INTO WRN LA. AS VERY MOIST/UNSTABLE AIRMASS MOVES INLAND
TORNADIC SUPERCELL POTENTIAL IS EXPECTED TO INCREASE EWD ACROSS SRN
LA.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 24035.
...HALES
312,0900 291,0905 291,0934 312,0930SPC 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, 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, 3:00 AM CST | Tornado Watch | SPC | Acadia, Ascension, Assumption, Cameron, East Baton Rouge, East Feliciana and 16 more | 5 hr |
| 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.