Alert archive / Louisiana / Flash Flood Warnings in 1991

Flash Flood Warning 18, NWS Shreveport, LA

April 12, 19914 parishes in Louisiana; Lafayette County, Miller County, Arkansas

NWS Shreveport, LA issued this flash flood warning at Apr 12, 1991, 8:55 AM CDT for 4 parishes in Louisiana; Lafayette County, Miller County, Arkansas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 1991, 8:55 AM CDT (13:55 UTC)
Expired
Apr 12, 1991, 12:00 PM CDT
In force
3 hr
Issued by
NWS Shreveport, LA
Area
Whole counties

Counties Lafayette County, AR, Miller County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA

The nearest sounding before it

Longview/Gregg, TX (KGGG), launched 12:00Z, 1.9 hours before the alert went out and 110 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 12:00Z on 1991-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1212 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 12:00Z on 1991-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 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
1212 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
562 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
364 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 12, 3:14 AM CDT, 5 hours 41 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-120930-

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.
Special weather statement, Apr 12, 5:02 AM CDT, 3 hours 53 minutes before
OKZ040-021-034-TXZ022-023-027-028-032-033-ARZ009-010-011-016-LAZ001-
002-003-004-005-006-121100-

SPECIAL WEATHER AND FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
455 AM CDT FRI APR 12 1991

...A SEVERE THUNDERSTORM WARNING REMAINED IN EFFECT FOR CADDO AND
BOSSIER PARISHES UNTIL 530 AM...A FLASH FLOOD WARNING REMAINED IN
EFFECT FOR EASTERN BOWIE AND NORTHWESTERN MILLER COUNTIES UNTIL
645 AM AND FOR CADDO...BOSSIER...DE SOTO AND WEBSTER PARISHES UNTIL
745 AM...

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

AT 450 AM CDT THE NATIONAL WEATHER SERVICE RADAR IN SHREVEPORT SHOWED
SCATTERED SHOWERS AND THUNDERSTORMS THAT EXTENDED NORTHWEST OF A LINE
FROM JUNCTION CITY ARKANSAS TO HOMER LOUISIANA TO MANY LOUISIANA. THE
RAIN EXTENDED NORTHWEST OF THIS LINE SOME 125 MILES. WITHIN THIS LARGE
AREA...POSSIBLE SEVERE THUNDERSTORMS WERE LOCATED OVER NORTH SHREVEPORT
AND SOUTH OF BENTON LOUISIANA. OTHER STRONG THUNDERSTORMS WERE NOTED
FROM NEAR MANSFIELD LOUISIANA TO NEAR SPRINGHILL LOUISIANA ALSO FROM
NEAR CANFIELD ARKANSAS TO NEAR BETHANY LOUISIANA. OTHER THUNDERSTORMS
THAT WERE PRODUCING GUSTY WINDS AND HEAVY RAINS WERE NOTED FROM LAKE O
THE PINES IN NORTHEAST TEXAS ACROSS TEXARKANA TO NEAR CAMDEN ARKANSAS.

MOVEMENT WAS NORTHEAST NEAR 30 MILES AN HOUR.

ANOTHER BAND OF SHOWERS AND THUNDERSTORMS...ABOUT 25 MILES WIDE...
EXTENDED FROM NEAR ST JOSEPH LOUISIANA ACROSS BASTROP LOUISIANA TO
FORDYCE ARKANSAS.

DURING THE PAST HALF HOUR...WIND GUSTS TO 63 MILE AN HOUR OCCURRED IN
SHREVEPORT LOUISIANA ALONG WITH 1/2 HAIL.

THE STORMS ALONG THE LOUISIANA/TEXAS BORDER SECTIONS AND SOUTHWEST
ARKANSAS CONTINUED TO INTENSIFY. HEAVY RAINS WILL COgNTINUE TO AFFECT
THE AREA. AS THE SHOWERS AND THUNDERSTORMS CONTINUE TO SPREAD OVER
THE SAME GENERAL AREA RAINFALL AMOUNTS OVER NORTHEAST TEXAS AND
SOUTHWEST ARKANSAS AS WELL AS NORTHWEST LOUISIANA 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 WarningSHVCaddo, De Soto3 hr
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 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
Apr 12, 6:55 AM CDTFlash Flood WarningSHVBowie2 hr
Apr 12, 8:55 AM CDTFlash Flood WarningSHVHarrison3 hr
Apr 12, 11:50 AM CDTFlash Flood WarningSHVHarrison, Marion, Panola3 hr

Nearby

Flash Flood Warnings in Louisiana, 1991Flash Flood Warnings in Arkansas, 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.