Alert archive / Louisiana / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 162

April 7, 20004 counties in Arkansas; 18 parishes in Louisiana; 17 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2000, 8:30 PM CDT for 4 counties in Arkansas; 18 parishes in Louisiana; 17 counties in Texas. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Apr 7, 2000, 8:30 PM CDT (01:30 UTC)
Expired: Apr 8, 2000, 12:00 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 39 counties

Ashley County, AR, Bradley County, AR, Drew County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Anderson County, TX, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Grimes County, TX, Harrison County, TX, Houston County, TX, Leon County, TX, Madison County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Trinity County, TX, Walker County, TX

The radar

The Shreveport radar (KSHV), 43 km from the middle of the area, began a volume at 01:29 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

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

Issued	Product	Office	Counties	Lasted
Apr 7, 8:41 PM CDT	Severe Thunderstorm Warning	FWD	Anderson	64 min
Apr 7, 8:43 PM CDT	Tornado Warning	SHV	Cherokee, Nacogdoches, Rusk	62 min
Apr 7, 8:48 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	42 min
Apr 7, 8:51 PM CDT	Severe Thunderstorm Warning	LZK	Bradley, Calhoun, Cleveland, Drew, Lincoln	49 min
Apr 7, 8:51 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	54 min
Apr 7, 9:06 PM CDT	Severe Thunderstorm Warning	HGX	Houston	54 min
Apr 7, 9:18 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	42 min
Apr 7, 9:34 PM CDT	Severe Thunderstorm Warning	FWD	Leon	41 min
Apr 7, 9:37 PM CDT	Severe Thunderstorm Warning	JAN	Ashley	38 min
Apr 7, 9:45 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches	60 min
Apr 7, 9:52 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	38 min
Apr 7, 9:52 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Madison	68 min
Apr 7, 10:14 PM CDT	Severe Thunderstorm Warning	JAN	Ashley, Chicot	46 min
Apr 7, 10:22 PM CDT	Severe Thunderstorm Warning	HGX	Trinity	68 min
Apr 7, 10:24 PM CDT	Severe Thunderstorm Warning	SHV	Angelina	51 min
Apr 7, 10:32 PM CDT	Severe Thunderstorm Warning	HGX	Walker	43 min
Apr 7, 10:44 PM CDT	Severe Thunderstorm Warning	HGX	Polk, Trinity	46 min
Apr 7, 10:55 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	50 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.5 hours before the alert went out and 51 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: 1646 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1454 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.8

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 080118
MKC WW 080118
ARZ000-LAZ000-TXZ000-080500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 162
STORM PREDICTION CENTER NORMAN OK
818 PM CDT FRI APR 7 2000

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

   SOUTHEAST ARKANSAS                           
   NORTHERN LOUISIANA                          
   EASTERN TEXAS                              

EFFECTIVE THIS FRIDAY NIGHT FROM 830 PM UNTIL MIDNIGHT 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 55 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 75 MILES WEST OF LUFKIN TEXAS TO 60
MILES NORTHEAST OF MONROE 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...  CONTINUE...WW 161...

DISCUSSION...SEVERAL BANDS OF SEVERE STORMS ARE SPREADING SEWD
ALONG COLD FRONT MOVING ACROSS AR AND NERN TX.  00Z SHV SOUNDING
SHOWED STRONG INSTABILITY WITH MUCAPE AROUND 3000 J/KG.  WINDS
ALOFT ARE EXPECTED TO INCREASE ACROSS THE AREA AS SRN PART OF
STRONG UPPER SHORT WAVE TROUGH DEEPENS ACROSS THE CENTRAL/SRN
PLAINS.


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 27035.


...WEISS

;322,0911 302,0960 320,0960 335,0911;

Nearby

Severe Thunderstorm Watches in Louisiana, 2000 Severe Thunderstorm Watches in Texas, 2000 Severe Thunderstorm Watches in Arkansas, 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; radar from the NEXRAD Level II archive.