Alert archive / Louisiana / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 151

April 2, 200018 parishes in Louisiana

The Storm Prediction Center issued this severe thunderstorm watch at Apr 2, 2000, 11:30 PM CDT for 18 parishes in Louisiana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Apr 2, 2000, 11:30 PM CDT (04:30 UTC)
Expired: Apr 3, 2000, 5:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vernon Parish, LA

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Apr 2, 11:30 PM CDT	Severe Thunderstorm Warning	LCH	Vernon	60 min
Apr 2, 11:56 PM CDT	Severe Thunderstorm Warning	LCH	Allen, Rapides	64 min
Apr 3, 12:01 AM CDT	Severe Thunderstorm Warning	LCH	Beauregard	59 min
Apr 3, 2:00 AM CDT	Severe Thunderstorm Warning	JAN	Concordia	45 min
Apr 3, 3:11 AM CDT	Severe Thunderstorm Warning	JAN	Franklin, Richland	34 min
Apr 3, 3:37 AM CDT	Tornado Warning	LCH	Beauregard, Vernon	68 min
Apr 3, 4:36 AM CDT	Severe Thunderstorm Warning	JAN	Franklin	24 min
Apr 3, 4:45 AM CDT	Severe Thunderstorm Warning	LCH	Calcasieu	60 min
Apr 3, 4:55 AM CDT	Flash Flood Warning	JAN	East Carroll, Franklin, Madison, Richland	6 hr
Apr 3, 5:00 AM CDT	Tornado Warning	LCH	Calcasieu	60 min

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.5 hours before the alert went out and 124 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: 656 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 251 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

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

012 
WWUS9 KMKC 030414
SEL1  

SEL1  
MKC WW 030414
LAZ000-031000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 151
STORM PREDICTION CENTER NORMAN OK
1114 PM CDT SUN APR 2 2000

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

   SOUTHWESTERN AND SOUTH CENTRAL LOUISIANA                       
  
EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1130 PM UNTIL
500 AM 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 60 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST OF FORT POLK
LOUISIANA TO 50 MILES EAST NORTHEAST OF ALEXANDRIA LOUISIANA.

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
TORNADO WATCH NUMBER 147.  WATCH NUMBER 147 WILL NOT BE IN EFFECT
AFTER 1130 PM CDT.  CONTINUE...WW 148...WW 149...WW 150...

DISCUSSION...LINE OF ELEVATED THUNDERSTORMS MOVING INTO WATCH AREA
WHERE CAPES ABOVE BOUNDARY LAYER IN EXCESS OF 2000 J/KG. INCREASED
FORCING AND COOLING ALOFT AHEAD OF UPPER TROUGH INDICATE PRIMARY
THREAT OF LARGE HAIL.

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.

...ROGASH

304,0913 294,0933 313,0933 323,0913

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 7:30 PM CDT	Tornado Watch	SPC	Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 4 more	7 hr
Apr 3, 2:00 AM CDT	Severe Thunderstorm Watch	SPC	Madison, Tensas, West Feliciana	6 hr
Apr 3, 4:45 AM CDT	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 11 more	5 hr
Apr 3, 7:00 AM CDT	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 13 more	5 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 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.