Alert archive / Louisiana / Tornado Watches in 1998

Tornado Watch 896

November 10, 199821 parishes in Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 10, 1998, 11:15 AM CST for 21 parishes in Louisiana; 5 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Nov 10, 1998, 11:15 AM CST (17:15 UTC)
Expired: Nov 10, 1998, 4:00 PM CST
In force: 5 hr
Issued by: the Storm Prediction Center

All 26 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville 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 Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Pearl River County, MS, Stone County, MS

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Nov 10, 11:18 AM CST	Severe Thunderstorm Warning	LIX	Iberville	47 min
Nov 10, 11:24 AM CST	Severe Thunderstorm Warning	LIX	Washington	46 min
Nov 10, 11:39 AM CST	Tornado Warning	LIX	Washington	31 min
Nov 10, 12:00 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa	35 min
Nov 10, 12:14 PM CST	Tornado Warning	LIX	Washington	36 min
Nov 10, 12:42 PM CST	Tornado Warning	LIX	Pearl River	48 min
Nov 10, 1:07 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa	63 min
Nov 10, 1:37 PM CST	Severe Thunderstorm Warning	LIX	Pearl River	33 min
Nov 10, 1:59 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	46 min
Nov 10, 2:07 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	48 min
Nov 10, 3:12 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	48 min
Nov 10, 3:27 PM CST	Severe Thunderstorm Warning	LIX	Plaquemines, Saint Bernard	33 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.3 hours before the alert went out and 92 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: 967 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 540 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 344 m²/s²
0-3 km storm-relative helicity: 471 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

317 
WWUS9 KMKC 101638
SEL6  
MKC WW 101638
LAZ000-MSZ000-102200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 896
STORM PREDICTION CENTER NORMAN OK
1038 AM CST TUE NOV 10 1998

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

   SOUTHEAST LOUISIANA                          
   SOUTHERN MISSISSIPPI                        
   AND ADJACENT COASTAL WATERS

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 1115 AM UNTIL 400
PM 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 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES SOUTH SOUTHWEST OF HOUMA LOUISIANA TO 55
MILES NORTHWEST 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 890...WW 892...WW
893...WW 894...WW 895...

DISCUSSION...WITH VERY MOIST AND UNSTABLE AIRMASS
AVAILABLE...STORMS ARE INTENSIFYING ALONG AND AHEAD OF SQUALL LINE. 
SHEAR PROFILES ARE FAVORABLE FOR SUPERCELLS AND ISOLATED 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 500. 
MEAN STORM MOTION VECTOR 24035.


...HALES

292,0920 305,0910 305,0882 292,0892

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 10, 6:15 AM CST	Tornado Watch	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 31 more	5 hr
Nov 10, 10:00 AM CST	Tornado Watch	SPC	Amite, Choctaw, Clarke, Clay, Copiah, Covington and 28 more	5 hr

Nearby

Tornado Watches in Louisiana, 1998 Tornado Watches in Mississippi, 1998 Every tornado watch in 1998

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.