Alert archive / Louisiana / Tornado Watches in 2002

Tornado Watch 728

October 25, 200212 parishes in Louisiana; 9 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Oct 25, 2002, 6:40 PM CDT for 12 parishes in Louisiana; 9 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Oct 25, 2002, 6:40 PM CDT (23:40 UTC)
Expired: Oct 26, 2002, 12:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 21 counties

Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles 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, Forrest County, MS, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Walthall 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
Oct 25, 6:49 PM CDT	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	11 days
Oct 25, 6:49 PM CDT	Tornado Warning	LIX	Saint John the Baptist	26 min
Oct 25, 7:08 PM CDT	Tornado Warning	LIX	Jefferson, Saint Charles	17 days
Oct 25, 7:17 PM CDT	Tornado Warning	LIX	Jefferson, Plaquemines	48 days
Oct 25, 7:43 PM CDT	Tornado Warning	LIX	Saint Charles	55 days
Oct 25, 8:04 PM CDT	Tornado Warning	LIX	Saint Charles	55 days
Oct 25, 8:26 PM CDT	Tornado Warning	LIX	Orleans, Plaquemines, Saint Bernard	34 min
Oct 25, 8:31 PM CDT	Tornado Warning	LIX	Saint Tammany	55 days
Oct 25, 10:37 PM CDT	Tornado Warning	LIX	Hancock	55 days

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.7 hours before the alert went out and 52 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 13 J/kg
Mixed-layer CIN: -230 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 252337
SEL8  
SPC WW 252340
LAZ000-MSZ000-CWZ000-260500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 728
STORM PREDICTION CENTER NORMAN OK
640 PM CDT FRI OCT 25 2002

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

   SOUTHEAST LOUISIANA                          
   SOUTHEAST MISSISSIPPI                        
   COASTAL WATERS                     

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 640 PM UNTIL
MIDNIGHT CDT.

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 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 35 MILES SOUTH SOUTHEAST OF HOUMA LOUISIANA TO 55
MILES NORTH OF GULFPORT 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.


DISCUSSION...VERY MOIST TROPICAL AIRMASS...COUPLED WITH FAVORABLY
SHEARED ENVIRONMENT HAS RESULTED IN DEVELOPMENT OF SMALL SUPERCELLS
ALONG/AHEAD OF WEAK INSTABILITY LINE MOVING EWD ACROSS SRN LA. 
ISOLATED TORNADOES WILL BE POSSIBLE ASSOCIATED WITH THE SUPERCELLS
NEXT SEVERAL HOURS.


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 500. 
MEAN STORM MOTION VECTOR 24025.


...HALES

311,0880 290,0892 290,0912 311,0900

Nearby

Tornado Watches in Louisiana, 2002 Tornado Watches in Mississippi, 2002 Every tornado watch in 2002

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.