Alert archive / Louisiana / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 13

January 11, 19986 counties in Arkansas; 20 parishes in Louisiana

The Storm Prediction Center issued this severe thunderstorm watch at Jan 11, 1998, 5:45 PM CST for 6 counties in Arkansas; 20 parishes in Louisiana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jan 11, 1998, 5:45 PM CST (23:45 UTC)
Expired: Jan 12, 1998, 12:00 AM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 26 counties

Ashley County, AR, Chicot County, AR, Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA

The radar

The Shreveport radar (KSHV), 94 km from the middle of the area, began a volume at 23:49 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

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

Issued	Product	Office	Counties	Lasted
Jan 11, 5:53 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo	52 min
Jan 11, 6:19 PM CST	Severe Thunderstorm Warning	SHV	Columbia	56 min
Jan 11, 6:58 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo	47 min
Jan 11, 7:42 PM CST	Severe Thunderstorm Warning	SHV	Bossier	48 min
Jan 11, 7:55 PM CST	Severe Thunderstorm Warning	SHV	Webster	35 min
Jan 11, 8:12 PM CST	Severe Thunderstorm Warning	SHV	Caddo, De Soto	48 min
Jan 11, 8:30 PM CST	Severe Thunderstorm Warning	SHV	Bienville	60 min
Jan 11, 8:51 PM CST	Severe Thunderstorm Warning	SHV	Lincoln	69 min
Jan 11, 9:33 PM CST	Severe Thunderstorm Warning	SHV	Bienville	27 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.8 hours before the alert went out and 85 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: 8 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 752 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 207 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

076 
WWUS9 KMKC 112310
SEL3  
MKC WW 112310
LAZ000-ARZ000-120600-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 13
STORM PREDICTION CENTER NORMAN OK
510 PM CST SUN JAN 11 1998

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

   NORTHERN LOUISIANA                          
   SOUTHERN ARKANSAS                           

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 545 PM UNTIL
MIDNIGHT CST.

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 20 MILES NORTHWEST OF SHREVEPORT
LOUISIANA TO 50 MILES EAST 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 11...WW 12...

DISCUSSION...INTENSE THUNDERSTORMS NERN TX WILL CONTINUE EWD
VICINITY E/W FRONTAL BOUNDARY.  AIRMASS IS BECOMING INCREASINGLY
MOIST AND UNSTABLE.  APPROACH OF S/WV TROF N TEXAS WILL ENHANCE
UPWARD MOTION TO CONTINUE SEVERE THUNDERSTORM THREAT AS STORMS MOVE
EWD DURING EVENING.


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 450.  MEAN STORM
MOTION VECTOR 24035.


...HALES

332,0940 331,0911 314,0911 315,0940

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 11, 1:15 PM CST	Severe Thunderstorm Watch	SPC	Caddo	6 hr

Nearby

Severe Thunderstorm Watches in Louisiana, 1998 Severe Thunderstorm Watches in Arkansas, 1998 Every 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.