Alert archive / Louisiana / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 196

April 23, 200020 parishes in Louisiana; 13 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Apr 23, 2000, 2:45 PM CDT for 20 parishes in Louisiana; 13 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Apr 23, 2000, 2:45 PM CDT (19:45 UTC)
Expired: Apr 23, 2000, 8:00 PM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 33 counties

Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Pointe Coupee 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, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 23, 3:22 PM CDT	Severe Thunderstorm Warning	LCH	Saint Martin	68 min
Apr 23, 3:30 PM CDT	Severe Thunderstorm Warning	LCH	Lafayette	60 min

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.8 hours before the alert went out and 99 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1108 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 189 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.

171 
WWUS9 KMKC 231920
SEL6  
MKC WW 231920
LAZ000-MSZ000-240100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 196
STORM PREDICTION CENTER NORMAN OK
220 PM CDT SUN APR 23 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   SOUTHERN LOUISIANA                          
   SOUTHEASTERN MISSISSIPPI                        

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 245 PM UNTIL 800
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 45 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 15 MILES SOUTH SOUTHWEST OF
LAFAYETTE LOUISIANA TO 50 MILES EAST SOUTHEAST OF LAUREL
MISSISSIPPI.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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 194...WW 195...

DISCUSSION...STORMS INCREASING IN SRN LA WHERE UNSTABLE AIRMASS
PRESENT.  SHEAR PROFILES SUPPORT SEVERE STORMS WITH ISOLATED
SUPERCELLS.  PRIMARY THREAT WILL BE LARGE HAIL AS STORMS DEVELOP
EWD ACROSS SRN MS.


AVIATION...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

304,0882 292,0920 303,0920 320,0882

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 4:00 PM CDT	Tornado Watch	SPC	Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 3 more	6 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 2000 Severe Thunderstorm Watches in Mississippi, 2000 Every severe thunderstorm watch in 2000

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.