Alert archive / Louisiana / Tornado Watches in 2003
Tornado Watch 977
The Storm Prediction Center issued this tornado watch at Nov 27, 2003, 5:25 AM CST for 12 counties in Alabama; 17 parishes in Louisiana; 15 counties in Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 27, 2003, 5:25 AM CST (11:25 UTC)
- Expired
- Nov 27, 2003, 11:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 44 counties
Bibb County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Hale County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Washington County, AL, Wilcox County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 27, 5:43 AM CST | Tornado Warning | JAN | Jones | 47 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 | Saint Tammany | 38 min |
| Nov 27, 7:25 AM CST | Flash Flood Warning | JAN | Jones | 95 min |
| Nov 27, 7:27 AM CST | Severe Thunderstorm Warning | LIX | Saint Tammany | 63 min |
| Nov 27, 9:42 AM CST | Tornado Warning | BMX | Dallas, Marengo, Perry | 48 min |
| Nov 27, 10:22 AM CST | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Plaquemines | 38 min |
| Nov 27, 10:26 AM CST | Tornado Warning | BMX | Dallas | 34 min |
| Nov 27, 10:47 AM CST | Severe Thunderstorm Warning | MOB | Washington | 43 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, 11.4 hours before the alert went out and 69 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
- 1 J/kg
- Mixed-layer CIN
- -118 J/kg
- Mixed-layer LCL
- 602 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 278 m²/s²
- 0-3 km storm-relative helicity
- 334 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 271126
SEL7
SPC WW 271125
ALZ000-LAZ000-MSZ000-CWZ000-271700-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 977
NWS STORM PREDICTION CENTER NORMAN OK
525 AM CST THU NOV 27 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH-CENTRAL AND SOUTHWESTERN ALABAMA
SOUTHEASTERN LOUISIANA
SOUTHEASTERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS THURSDAY MORNING FROM 525 AM UNTIL 1100 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 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 40 MILES WEST OF HOUMA LOUISIANA TO 5 MILES
EAST SOUTHEAST OF SELMA ALABAMA.
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 976. WATCH NUMBER 976 WILL NOT BE IN EFFECT AFTER 525
AM CST.
DISCUSSION...BANDS OF SEVERE TSTMS SHOULD MOVE EWD ACROSS REGION
BETWEEN GULF COAST AND WARM FRONT...IN ENVIRONMENT OF FAVORABLE
SHEAR AND NEAR SFC-BASED INSTABILITY TO SUPPORT TORNADO AND DAMAGING
WIND POTENTIAL. WARM FRONT SHOULD LIFT NEWD INTO SWRN
AL...INCREASING THREAT OVER THAT AREA.
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
303,0912 331,0865 312,0865 283,0912SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 27, 7:48 AM CST | Mesoscale Discussion | SPC | Bibb, Choctaw, Clarke, Conecuh, Dallas, Hale and 6 more | 117 min |
| Nov 27, 9:53 AM CST | Mesoscale Discussion | SPC | Bibb, Choctaw, Clarke, Conecuh, Dallas, Hale and 6 more | 2 hr |
| 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, 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, 7:49 AM CST | Mesoscale Discussion | SPC | Acadia, Calcasieu, Cameron, Iberia, Jefferson Davis, Lafayette and 2 more | 2 hr |
Nearby
Tornado Watches in Louisiana, 2003Tornado Watches in Mississippi, 2003Tornado Watches in Alabama, 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.