Alert archive / Louisiana / Tornado Watches in 2000

Tornado Watch 198

April 23, 20004 states

The Storm Prediction Center issued this tornado watch at Apr 23, 2000, 8:00 PM CDT for 4 states. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2000, 8:00 PM CDT (01:00 UTC)
Expired
Apr 24, 2000, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 44 counties

Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Columbia County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Carroll County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Montgomery County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS, Nacogdoches County, TX, Panola County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 93 km from the middle of the area, began a volume at 01:03 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 23, 8:00 PM CDTSevere Thunderstorm WarningSHVNacogdoches60 min
Apr 23, 8:22 PM CDTTornado WarningSHVJackson, Lincoln, Ouachita53 min
Apr 23, 8:30 PM CDTSevere Thunderstorm WarningSHVUnion35 min
Apr 23, 8:37 PM CDTTornado WarningSHVGrant, Winn53 min
Apr 23, 8:38 PM CDTTornado WarningJANAshley52 min
Apr 23, 8:41 PM CDTTornado WarningSHVUnion19 min
Apr 23, 8:50 PM CDTSevere Thunderstorm WarningSHVSabine, Shelby55 min
Apr 23, 9:00 PM CDTTornado WarningSHVUnion15 min
Apr 23, 9:03 PM CDTTornado WarningJANMorehouse42 min
Apr 23, 9:03 PM CDTSevere Thunderstorm WarningSHVNacogdoches, San Augustine57 min
Apr 23, 9:12 PM CDTSevere Thunderstorm WarningSHVLaSalle48 min
Apr 23, 9:18 PM CDTSevere Thunderstorm WarningSHVOuachita42 min
Apr 23, 9:20 PM CDTSevere Thunderstorm WarningSHVSabine40 min
Apr 23, 9:24 PM CDTSevere Thunderstorm WarningSHVNatchitoches, Winn36 min
Apr 23, 9:30 PM CDTSevere Thunderstorm WarningSHVCaldwell30 min
Apr 23, 9:43 PM CDTSevere Thunderstorm WarningJANFranklin, Richland32 min
Apr 23, 9:50 PM CDTSevere Thunderstorm WarningJANCatahoula40 min
Apr 23, 10:14 PM CDTSevere Thunderstorm WarningJANFranklin, Tensas46 min
Apr 23, 10:17 PM CDTTornado WarningJANCatahoula, Concordia43 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.0 hours before the alert went out and 86 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-pSkew-T log-p diagram, Shreveport, LA at 00:00Z on 2000-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1042 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 00:00Z on 2000-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 368 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
1042 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
1141 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
368 m²/s²
0-3 km storm-relative helicity
558 m²/s²
Significant tornado parameter
2.0
Supercell composite
11.5

Open this sounding in Storm Lab

The text

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

959 
WWUS9 KMKC 240043
SEL8  

SEL8  
MKC WW 240043
ARZ000-LAZ000-MSZ000-TXZ000-240700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 198
STORM PREDICTION CENTER NORMAN OK
743 PM CDT SUN APR 23 2000

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

   SOUTHERN ARKANSAS                           
   NORTHERN LOUISIANA                          
   WESTERN MISSISSIPPI                        
   EAST CENTRAL TEXAS                              

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 800 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 100 STATUTE MILES EAST AND WEST
OF A LINE FROM 65 MILES WEST OF ALEXANDRIA LOUISIANA TO 15 MILES
WEST NORTHWEST OF GREENVILLE 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...THIS TORNADO WATCH REPLACES TORNADO WATCH
NUMBER 197.  WATCH NUMBER 197 WILL NOT BE IN EFFECT AFTER 800 PM
CDT.  CONTINUE...WW 196 TIL SCHEDULED EXPIRATION AT 01Z.  A NEW WW
/SEVERE/ WILL BE ISSUED SHORTLY FOR CNTRL/ERN AR.   

DISCUSSION...SUPERCELLS WILL CONTINUE E/ESE IN HIGH SHEAR/MDT CAPE
ENVIRONMENT ACROSS NRN LA THIS EVENING /60+ KT WLY FLOW AT 500
MB...SURFACE-BASED CAPE TO 3500 IN E TX...DIMINISHING TO 1500 IN NE
LA /.  UPSTREAM STORMS OVER E TX/NW LA EXPECTED TO CONTINUE
ORGANIZING INTO A LINE AS LOWER TROPOSPHERIC FLOW BEHIND LINE
BECOMES MORE WNWLY AND INCREASES.  CAP SHOULD LIMIT SWD DEVELOPMENT
OF STORMS INTO SRN LA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 28030.

...CORFIDI

333,0892 312,0914 312,0950 333,0925

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 8:00 PM CDTSevere Thunderstorm WatchSPCArkansas, Cleveland, Conway, Cross, Dallas, Desha and 17 more6 hr
Apr 23, 9:30 PM CDTTornado WatchSPCAllen, Avoyelles, Beauregard, East Baton Rouge, East Feliciana, Evangeline and 8 more6 hr
Apr 24, 1:15 AM CDTSevere Thunderstorm WatchSPCAscension, Assumption, Iberia, Iberville, Jefferson, Lafayette and 13 more5 hr
Apr 23, 10:45 PM CDTSevere Thunderstorm WatchSPCAdams, Claiborne, Clarke, Copiah, Covington, Franklin and 18 more4 hr
Apr 24, 5:00 PM CDTSevere Thunderstorm WatchSPCDallam, Hansford, Hartley, Hutchinson, Moore, Ochiltree and 2 more5 hr

Nearby

Tornado Watches in Louisiana, 2000Tornado Watches in Mississippi, 2000Tornado Watches in Arkansas, 2000Every tornado 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; radar from the NEXRAD Level II archive.