Alert archive / Louisiana / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 511

June 4, 199813 parishes in Louisiana; 12 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Jun 4, 1998, 11:30 PM CDT for 13 parishes in Louisiana; 12 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 4, 1998, 11:30 PM CDT (04:30 UTC)
Expired
Jun 5, 1998, 5:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 25 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Cass County, TX, Cherokee County, TX, Harrison County, TX, Houston County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX

The radar

The Shreveport radar (KSHV), 58 km from the middle of the area, began a volume at 04:32 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

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

IssuedProductOfficeCountiesLasted
Jun 4, 11:33 PM CDTSevere Thunderstorm WarningSHVGregg, Harrison62 min
Jun 4, 11:33 PM CDTSevere Thunderstorm WarningSHVCass, Marion62 min
Jun 4, 11:45 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo60 min
Jun 4, 11:57 PM CDTSevere Thunderstorm WarningSHVRusk58 min
Jun 5, 12:20 AM CDTSevere Thunderstorm WarningSHVWebster60 min
Jun 5, 12:28 AM CDTSevere Thunderstorm WarningSHVPanola47 min
Jun 5, 12:40 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo45 min
Jun 5, 12:49 AM CDTSevere Thunderstorm WarningSHVClaiborne61 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.5 hours before the alert went out and 65 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 1998-06-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2429 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 1998-06-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 2 square meters per square second.193958Sfc1 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
2429 J/kg
Mixed-layer CIN
-77 J/kg
Mixed-layer LCL
1497 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
2 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

120 
WWUS9 KMKC 050403
SEL1  
MKC WW 050403
TXZ000-LAZ000-051000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 511
STORM PREDICTION CENTER NORMAN OK
1103 PM CDT THU JUN 4 1998

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

   EASTERN TEXAS                              
   NORTHERN LOUISIANA                          

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1130 PM UNTIL
500 AM CDT.

HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 85
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES EAST OF LUFKIN TEXAS TO 65
MILES NORTHEAST OF SHREVEPORT 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 509...WW 510...

DISCUSSION...INTENSE SQUALL LINE EXPECTED TO MOVE EASTWARD WITH
RISK OF BOW ECHO DEVELOP.  LARGE HAIL LIKELY WITH STRONGER CELLS
AND DAMAGING WINDS LIKELY WITH BOWS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 75
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 580.  MEAN STORM
MOTION VECTOR 24030.


...JOHNS

311,0954 330,0942 330,0914 311,0930

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 5, 10:30 AM CDTSevere Thunderstorm WatchSPCAvoyelles, Caldwell, Catahoula, Concordia, East Carroll, Franklin and 9 more7 hr
Jun 5, 6:15 PM CDTSevere Thunderstorm WatchSPCAllen, Beauregard, Calcasieu, Grant, Jackson, Natchitoches and 4 more4 hr
Jun 4, 8:45 PM CDTSevere Thunderstorm WatchSPCAnderson, Bosque, Bowie, Camp, Cass, Collin and 28 more5 hr
Jun 4, 11:15 PM CDTSevere Thunderstorm WatchSPCCass6 hr
Jun 5, 4:00 PM CDTSevere Thunderstorm WatchSPCAnderson, Angelina, Atascosa, Austin, Bastrop, Bell and 39 more6 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 1998Severe Thunderstorm Watches in Texas, 1998Every severe thunderstorm 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; radar from the NEXRAD Level II archive.