Alert archive / Louisiana / Tornado Watches in 1997

Tornado Watch 798

November 28, 199736 parishes in Louisiana; Hancock County, Mississippi

The Storm Prediction Center issued this tornado watch at Nov 28, 1997, 8:00 PM CST for 36 parishes in Louisiana; Hancock County, Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Nov 28, 1997, 8:00 PM CST (02:00 UTC)
Expired: Nov 29, 1997, 2:00 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 37 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard 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, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Hancock County, MS

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Nov 29, 12:56 AM CST	Flash Flood Warning	LIX	Saint Tammany	2 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.0 hours before the alert went out and 137 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: 826 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

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

361 
WWUS9 KMKC 290135
SEL8  
MKC WW 290135
LAZ000-290800-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 798
STORM PREDICTION CENTER NORMAN OK
735 PM CST FRI NOV 28 1997

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

   SOUTHERN LOUISIANA                          
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 800 PM UNTIL
200 AM CST.

TORNADOES...HAIL TO 1 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 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 30 MILES NORTH NORTHWEST OF LAKE CHARLES
LOUISIANA TO 20 MILES NORTH OF BOOTHVILLE 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 TORNADO WATCH
NUMBER 797.  WATCH NUMBER 797 WILL NOT BE IN EFFECT AFTER 800 PM
CST.

DISCUSSION...AREAS OF THUNDERSTORMS CONTINUE OVER SOUTHERN
LOUISIANA AND THE ADJACENT COASTAL WATERS. WEAK MID LEVEL LAPSE
RATES ARE LIMITING THE INSTABILITY OF THE AIR MASS. HOWEVER...
SURFACE DEWPOINTS NEAR 70F AND STRONG LOW-MID LEVEL SHEAR INDICATE
A CONTINUED THREAT FOR ISOLATED SUPERCELL TORNADOES.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. 
MEAN STORM MOTION VECTOR 24035.


...VESCIO

312,0932 303,0892 284,0892 293,0932

Nearby

Tornado Watches in Louisiana, 1997 Tornado Watches in Mississippi, 1997 Every tornado watch in 1997

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.