Alert archive / Louisiana / Flash Flood Warnings in 1991

Flash Flood Warning 13, NWS Shreveport, LA

April 12, 1991Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this flash flood warning at Apr 12, 1991, 4:42 AM CDT for Caddo Parish, De Soto Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 1991, 4:42 AM CDT (09:42 UTC)
Expired
Apr 12, 1991, 7:45 AM CDT
In force
3 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Caddo Parish, LA, De Soto Parish, LA

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 00:00Z, 9.7 hours before the alert went out and 74 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, Longview/Gregg, TX at 00:00Z on 1991-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 633 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, Longview/Gregg, TX at 00:00Z on 1991-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 266 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
633 J/kg
Mixed-layer CIN
-105 J/kg
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
266 m²/s²
0-3 km storm-relative helicity
418 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSHV 120945
FFWSHV
LAC015-017-031-119-121245-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
442 AM CDT FRI APR 12 1991
 
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  745 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS..
 
IN NORTHWEST LOUISIANA
 
   ...BOSSIER PARISH...CADDO PARISH...DESOTO PARISH...WEBSTER PARISH
 
AT 440 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT
SHOWED A BAND OF STRONG THUNDERSTORMS THAT EXTENDED FROM NEAR
SPRINGHILL LOUISIANA TO NEAR MANSFIELD LOUISIANA. ANOTHER BAND
OF STRONG THUNDERSTORMS WAS NOTED FROM BENTON LOUISIANA TO
BETHANY LOUISIANA.
 
THESE STORMS WERE PRODUCING STRONG WINDS...HAIL AND FLOOD
PRODUCING RAINFALL.
 
MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR. EVEN WITH THE
GOOD MOVEMENT THE STORMS THE STORMS WERE TRACKING OVER THE
SAME GENERAL AREA.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGUNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Apr 11, 11:01 PM CDT, 5 hours 41 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120430-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1100 PM CDT THU APR 11 1991

...A SEVERE THUNDERSTORM WARNING REMAINED IN EFFECT FOR MC CURTAIN
COUNTY IN SOUTHEAST OKLAHOMA UNTIL 1115 PM...
...SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT UNTIL 300 AM FOR PARTS
OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA....

AT 1055 PM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED NORTHWEST OF A LINE
FROM MURFREESBORO ARKANSAS TO ASHDOWN ARKANSAS TO NEAR PITTSBURG TEXAS.
POSSIBLE SEVERE THUNDERSTORMS WERE NOTED FROM 5 MILES NORTH OF BROKEN
BOW OKLAHOMA TO 15 MILES NORTH OF VALLIANT OKLAHOMA. OTHER STRONG
THUNDERSTORMS WERE NORTH OF FOREMAN ARKANSAS. MOVEMENT WAS NORTHEAST
AT 25 MILES AN HOUR.

A 25 MILE WIDE AREA OF SHOWERS WAS INDICATED FROM NEAR LOGANSPORT
LOUISIANA ACROSS HALLSVILLE TEXAS TO NEAR MINEOLA TEXAS. ANOTHER AREA
OF SCATTERED SHOWERS WAS NOTED FROM NEAR REKLAW TEXAS TO NORTH OF
NACOGDOCHES TEXAS.

SCATTERED SHOWERS AND THUNDERSHOWERS WERE LOCATED IN A 30 MILE WIDE
AREA THAT EXTENDED FROM NEAR PALESTINE TEXAS TO SOUTH OF LUFKIN TEXAS.

ELSEWHERE...SCATTERED SHOWERS LINGERED OVER SOUTH CENTRAL ARKANSAS
FROM THE LOUISIANA/ARKANSAS BORDER NORTH OF HAYNESVILLE LOUISIANA TO
NEAR WARREN ARKANSAS.

THE SHOWERS AND THUNDERSTORMS OVER NORTH CENTRAL TEXAS 3WILL CONTINUE TO
DEVELOP AND INTENSIFY...AFFECTING THE WESTERN SECTIONS OF THE ARKLATEX
THROUGH THE NIGHT. LOCALLY HEAVY RAINS WILL OCCUR ALONG WITH THE THREAT
FOR HIGH WINDS AND LARGE HAIL.
Special weather statement, Apr 11, 11:37 PM CDT, 5 hours 5 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120600-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1130 PM CDT THU APR 11 1991

...THE SEVERE THUNDERSTORM WARNING ISSUED EARLIER FOR MC CURTAIN COUNTY
IN SOUTHEAST OKLAHOMA HAS EXPIRED...
...A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT UNTIL 300 AM FOR PARTS
OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA....

AT 1125 PM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED NORTHWEST OF A LINE
FROM NEAR MURFREESBORO ARKANSAS TO ASHDOWN ARKANSAS TO NEAR DANGERFIELD
TEXAS. STRONG THUNDERSTORMS WERE NOTED NEAR SMITHVILLE AND NEAR BETHEL
OKLAHOMA...ALSO NEAR DEQUEEN ARKANSAS AND NEAR MOUNT VERNON TEXAS.
MOVEMENT WAS NORTH NORTHEAST AT 25 MILES AN HOUR.

A 60 MILE WIDE AREA OF SHOWERS AND THUNDERSHOWERS WAS INDICATED FROM
NEAR LINDEN TEXAS TO NEAR CENTER TEXAS. MOVEMENT WAS NORTHEAST NEAR
25 MILES AN HOUR.

ELSEWHERE...SCATTERED SHOWERS LINGERED OVER SOUTH CENTRAL ARKANSAS
FROM NEAR EL DORADO ARKANSAS TO NEAR WARREN ARKANSAS.

THE SHOWERS AND THUNDERSTORMS OVER NORTH CENTRAL TEXAS WILL CONTINUE TO
DEVELOP AND INTENSIZFY...AFFECTING THE WESTERN SECTIONS OF THE ARKLATEX
THROUGH THE NIGHT. LOCALLY HEAVY RAINS WILL OCCUR ALONG WITH THE THREAT
FOR HIGH WINDS AND LARGE HAIL.
Special weather statement, Apr 12, 12:49 AM CDT, 3 hours 53 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1245 AM CDT FRI APR 12 1991

...A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT UNTIL 300 AM FOR PARTS
OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA....
...A FLASH FLOOD WATCH REMAINED IN EFFECT FOR SOUTHWEST ARKANSAS...

AT 1240 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED WEST OF A LINE FROM
NEAR MOUNT IDA ARKANSAS TO NORTHWEST OF HOPE ARKANSAS TO SHREVEPORT
LOUISIANA TO NEAR CENTER AND LUFKIN TEXAS. THE PRECIPITATION EXTENDED
ON WEST INTO THE DALLAS/FORT WORTH METROPLEX. WITHIN THIS LARGE AREA
THE HEAVIEST RAIN WAS OCCURRING NEAR ATLANTA TEXAS...NEAR JEFFERSON
TEXAS...SOUTH OF TYLER TEXAS AND NEAR RODESSA LOUISIANA. MOVEMENT WAS
NORTH NORTHEAST NEAR 25 MILES AN HOUR.

ALSO...SCATTERED SHOWERS WERE NOTED FROM NEAR WARREN ARKANSAS TO NEAR
MALVERN ARKANSAS.

THE SHOWERS AND THUNDERSTORMS OVER NORTH CENTRAL AND NORTHEAST TEXAS
WILL CONTINUE TO BE STRONG BUT THE THREAT FOR LARGE HAIL AND HIGH WINDS
HAS DIMINISHED SOMEWHAT. LOCALLY HEAVY RAINS HAVE NOW BECOME THE MAIN
CONCERN.
Special weather statement, Apr 12, 1:33 AM CDT, 3 hours 9 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
130 AM CDT FRI APR 12 1991

...A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT UNTIL 300 AM FOR PARTS
OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA....
...A FLASH FLOOD WATCH REMAINED IN EFFECT FOR SOUTHWEST ARKANSAS...

AT 125 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED WEST OF A LINE FROM
NEAR ARKADELPHIA ARKANSAS TO NEAR MAGNOLIA ARKANSAS TO NEAR MINDEN
LOUISIANA TO NEAR LUFKIN TEXAS. THE PRECIPITATION EXTENDED ON WEST TO
NEAR DURANT OKLAHOMA AND GREENVILLE TEXAS. WITHIN THIS LARGE AREA...
STRONG THUNDERSTORMS THAT WERE PRODUCING GUSTY WINDS AND HEAVY RAINS
WERE LOCATED NORTHEAST OF LONGVIEW TEXAS...NEAR JEFFERSON TEXAS...NEAR
LINDEN TEXAS...NEAR MAUD TEXAS...NEAR TEXARKANA ARKANSAS AND NEAR PLAIN
DEALING LOUISIANA. MOVEMENT WAS NORTHEAST AT 30 MILES AN HOUR.
.
OTHER SCATTERED SHOWERS WERE NOTED FROM NEAR WARREN ARKANSAS TO NEAR
SHERIDAN ARKANSAS.

THE SHOWERS AND THUNDERSTORMS OVER NORTH CENTRAL AND NORTHEAST TEXAS
WILL CONTINUE TO BE STRONG BUT THE THREAT FOR LARGE HAIL AND HIGH WINDS
HAS DIMINISHED SOMEWHAT. LOCALLY HEAVY RAINS HAVE NOW BECOME THE MAIN
CONCERN. AS THE SHOWERS AND THUNDERSTORMS CONTINUE TO SPREAD OVER THE
SAME GENERAL AREA RAINFALL AMOUNTS OVER NORTHEAST TEXAS AND SOUTHWEST
ARKANSAS WILL APPROACH TWO INCHES.
Special weather statement, Apr 12, 2:33 AM CDT, 2 hours 9 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120830-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
225 AM CDT FRI APR 12 1991

...A SEVERE THUNDERSTORM WATCH REMAINED IN EFFECT UNTIL 300 AM FOR PARTS
OF NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA....
...A FLASH FLOOD WATCH REMAINED IN EFFECT FOR SOUTHWEST ARKANSAS...

AT 220 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED WEST OF A LINE FROM
FORDYCE ARKANSAS TO JUNCTION CITY ARKANSAS TO NEAR ARCADIA LOUISIANA TO
STONEWALL LOUISIANA TO NEAR CENTER TEXAS. THE RAIN EXTENDED NORTHWEST
OF THIS LINE SOME 150 MILES. WITHIN THIS LARGE AREA...THUNDERSTORMS
THAT WERE PRODUCING GUSTY WINDS AND HEAVY RAINS WERE NOTED FROM 5 MILES
NORTHEAST OF TEXARKANA TO 15 MILES SOUTHWEST OF TEXARKANA TEXAS...ALSO
NEAR FOUKE ARKANSAS...SOUTHWEST OF EL DORADO ARKANSAS...NORTHWEST OF
MINDEN LOUISIANA AND FROM CADDO LAKE TO BETHANY LOUISIANA. MOVEMENT
WAS NORTHEAST NEAR 30 MILES AN HOUR.
.
ANOTHER STRONG THUNDERSTORM WAS LOCATED NEAR CLARKSVILLE TEXAS.

ALONG WITH THE GUSTY WINDS AND HEAVY RAINS...FREQUENT LIGHTNING WILL
ACCOMPANY THE STORMS.

THE SHOWERS AND THUNDERSTORMS OVER NORTHEAST TEXAS WILL CONTINUE TO
BE STRONG BUT THE THREAT FOR LARGE HAIL AND HIGH WINDS HAS DIMINISHED.
THE STORMS ALONG THE LOUISIANA/TEXAS BORDER SECTIONS AND SOUTHWEST
ARKANSAS WILL CONTINUE TO INTENSIFY. HEAVY RAINS WILL CONTINUE TO
AFFECT THE AREA. AS THE SHOWERS AND THUNDERSTORMS CONTINUE TO SPREAD
THE SAME GENERAL AREA RAINFALL AMOUNTS OVER NORTHEAST TEXAS AND SOUTH-
WEST ARKANSAS WILL APPROACH THREE INCHES.
Special weather statement, Apr 12, 3:14 AM CDT, 1 hour 28 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120930-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
310 AM CDT FRI APR 12 1991

...A FLASH FLOOD WATCH REMAINED IN EFFECT FOR SOUTHWEST ARKANSAS...

AT 305 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED NORTHWEST OF A LINE
FROM MONTICELLO ARKANSAS TO JUNCTION CITY ARKANSAS TO HOMER LOUISIANA
TO MANSFIELD LOUISIANA TO NEAR CENTER TEXAS. THE RAIN EXTENDED NORTHWEST
OF THIS LINE SOME 150 MILES. WITHIN THIS LARGE AREA...THUNDERSTORMS
THAT WERE PRODUCING GUSTY WINDS AND HEAVY RAINS WERE NOTED FROM NEAR
TEXARKANA ARKANSAS TO NEAR HUGHES SPRINGS TEXAS...ALSO NEAR VIVIAN
LOUISIANA AND FROM BENTON LOUISIANA TO TIMPSON TEXAS.
MOVEMENT WAS NORTHEAST NEAR 30 MILES AN HOUR.

ANOTHER 20 MILE WIDE AREA OF SHOWERS HAD DEVELOPED FROM NEAR SICILY
ISLAND LOUISIANA ACROSS CALHOUN TO NEAR BERNICE LOUISIANA.
.
OTHER SHOWERS AND THUNDERSTORMS WERE NOTED FROM NEAR VAN TEXAS TO NEAR
PARIS TEXAS.

ALONG WITH THE GUSTY WINDS AND HEAVY RAINS...FREQUENT LIGHTNING WILL
ACCOMPANY THE STORMS.

THE STORMS ALONG THE LOUISIANA/TEXAS BORDER SECTIONS AND SOUTHWEST
ARKANSAS WILL CONTINUE TO INTENSIFY. HEAVY RAINS WILL CONTINUE TO
AFFECT THE AREA. AS THE SHOWERS AND THUNDERSTORMS CONTINUE TO SPREAD
OVER THE SAME GENERAL AREA RAINFALL AMOUNTS OVER NORTHEAST TEXAS AND
SOUTHWEST ARKA%NSAS WILL APPROACH THREE INCHES IN SOME LOCATIONS.

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 4:32 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo58 min
Apr 12, 4:42 AM CDTFlash Flood WarningSHVBossier, Webster3 hr
Apr 12, 5:42 AM CDTSevere Thunderstorm WarningSHVBossier, Webster63 min
Apr 12, 6:43 AM CDTSevere Thunderstorm WarningSHVBienville, Claiborne, Webster62 min
Apr 12, 7:00 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo60 min
Apr 12, 7:20 AM CDTFlash Flood WarningSHVBossier, Webster115 min
Apr 12, 7:20 AM CDTFlash Flood WarningSHVCaddo115 min
Apr 12, 7:32 AM CDTTornado WarningSHVBossier, Caddo58 min
Apr 12, 7:57 AM CDTSevere Thunderstorm WarningSHVBossier, Webster63 min
Apr 12, 7:57 AM CDTSevere Thunderstorm WarningSHVCaddo63 min
Apr 12, 8:55 AM CDTFlash Flood WarningSHVBienville, Bossier, Caddo, Webster3 hr
Apr 12, 8:55 AM CDTFlash Flood WarningSHVDe Soto3 hr
Apr 12, 8:55 AM CDTFlash Flood WarningSHVClaiborne3 hr
Apr 12, 10:11 AM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Webster64 min
Apr 12, 11:05 AM CDTSevere Thunderstorm WarningSHVBossier, Caddo55 min
Apr 12, 11:50 AM CDTFlash Flood WarningSHVBienville, Bossier, Claiborne, Webster3 hr
Apr 12, 11:50 AM CDTFlash Flood WarningSHVCaddo3 hr
Apr 12, 11:50 AM CDTFlash Flood WarningSHVDe Soto3 hr
Apr 12, 12:03 PM CDTSevere Thunderstorm WarningSHVClaiborne, Webster87 min

Nearby

Flash Flood Warnings in Louisiana, 1991Every flash flood warning in 1991

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.