Alert archive / Louisiana / Flash Flood Warnings in 1993

Flash Flood Warning 2, NWS New Orleans, LA

January 11, 1993Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jan 11, 1993, 3:58 AM CST for Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Jan 11, 1993, 3:58 AM CST (09:58 UTC)
Expired
Jan 11, 1993, 9:00 AM CST
In force
5 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.0 hours before the alert went out and 61 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, Slidell Radar S, LA at 00:00Z on 1993-01-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Slidell Radar S, LA at 00:00Z on 1993-01-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 439 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
671 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
439 m²/s²
0-3 km storm-relative helicity
633 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 111000
FFWNEW
LAC075-087-111500-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
358 AM CST MON JAN 11 1993
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING        EFFECTIVE UNTIL  900 AM CST
FOR RESIDENTS IN THE FOLLOWING PARISHESS...
 
IN SOUTHEAST LOUISIANA
 
   ...NORTHERN PLAQUEMINES PARISH...WESTERN ST.BERNARD PARISH
 
AT 355 AM CST RADAR INDICATED THAT HEAVY RAINFALL HAS CONTINUED
OVER WESTERN ST. BERNARD AND NORTHERN PLAQUEMINES PARISHES IN
SOUTHEAST LOUISIANA.  CIVIL DEFENSE DIRECTOR OF ST. BERNARD
PARISH AND THE SHERIFFS OFFICE IN PLAQUEMINES PARISH REPORTED
SOME FLOODING.  WATER WAS UP TO THE CARPORTS OF SOME HOUSES.
HEAVY RAIN MAY CONTINUE OVER THIS AREA FOR THE NEXT SEVERAL
HOURS.
 
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

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, Jan 10, 10:25 PM CST, 5 hours 33 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-110600-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1025 PM CST SUN JAN 10 1993

AT 1025 PM A BAND OF THUNDERSTORMS...SOME STRONG WITH HEAVY RAINFALL
CONTINUED OVER THE EAST HALF OF LAKE PONTCHARTRAIN AND EXTENDED OVER THE
NEW ORLEANS AREA TO 25 MILES SOUTH OF NEW ORLEANS. THE HEAVIER RAINFALL WILL
PRODUCE SOME LOCALIZED STREET FLOODING IN AND AROUND THE NEW ORLEANS AREA.
MOTORIST SHOULD REMAIN ALERT FOR MINOR FLOODING OF STREETS AND UNDERPASSES.

WIDELY SCATTERED THUNDERSTORMS WERE INCLUDED IN LIGHT RAIN OVER MOST OF
SOUTHEAST NORTH OF LAKE PONTCHARTRAIN AND EXTENDED EAST INTO SOUTHEAST
MISSISSIPPI TO NEAR POPLARVILLE AND GULFPORT.

SCATTERED RAIN SHOWERS WERE OVER THE COASTAL SECTIONS OF SOUTHEAST LOUISIANA
NEAR TERREBONNE BAY AND TIMBALIER BAY.

WIDELY SCATTERED PATCHES OF LIGHT RAIN CONTINUED IN SOUTH MISSISSIPPI.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, Jan 10, 10:25 PM CST, 5 hours 33 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-110600-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY...CORRECTION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1025 PM CST SUN JAN 10 1993

AT 1025 PM A BAND OF THUNDERSTORMS...SOME STRONG WITH HEAVY RAINFALL
CONTINUED OVER THE EAST HALF OF LAKE PONTCHARTRAIN AND EXTENDED OVER THE
NEW ORLEANS AREA TO 25 MILES SOUTH OF NEW ORLEANS. THE HEAVIER RAINFALL WILL
PRODUCE SOME LOCALIZED STREET FLOODING IN AND AROUND THE NEW ORLEANS AREA.
MOTORIST SHOULD REMAIN ALERT FOR MINOR FLOODING OF STREETS AND UNDERPASSES.

WIDELY SCATTERED THUNDERSTORMS WERE INCLUDED IN LIGHT RAIN OVER MOST OF
SOUTHEAST LOUISIANA NORTH OF LAKE PONTCHARTRAIN AND EXTENDED EAST INTO
SOUTHEAST MISSISSIPPI TO NEAR POPLARVILLE AND GULFPORT.

SCATTERED RAIN SHOWERS WERE OVER THE COASTAL SECTIONS OF SOUTHEAST LOUISIANA
NEAR TERREBONNE BAY AND TIMBALIER BAY.

WIDELY SCATTERED PATCHES OF LIGHT RAIN CONTINUED IN SOUTH MISSISSIPPI.

THE THUNDERSTORMS WERE MOVING NORTHEAST AT 30 MILES AN HOUR.
Special weather statement, Jan 10, 11:25 PM CST, 4 hours 33 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-110700-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1125 PM CST SUN JAN 10 1993

AT 1125 PM A CLUSTER OF STRONG THUNDERSTORMS WITH HEAVY RAINFALL WAS OCCURRING
FROM JUST SOUTH OF SLIDELL SOUTH OVER EAST NEW ORLEANS. THE HEAVIER RAINFALL
WILL PRODUCE SOME LOCALIZED STREET FLOODING IN AND AROUND THE NEW ORLEANS AREA.
MOTORIST SHOULD REMAIN ALERT FOR MINOR FLOODING OF STREETS AND UNDERPASSES.
STONG GUSTY WINDS WILL BE EXPERIENCED IN SOME OF THE STRONGER THUNDERSORMS.

WIDELY SCATTERED THUNDERSTORMS WERE INCLUDED IN LIGHT RAIN OVER MOST OF
SOUTHEAST LOUISIANA NORTH OF LAKE PONTCHARTRAIN AND EXTENDED NORTH AND EAST
INTO MOST OF SOUTHEAST MISSISSIPPI EAST OF MCCOMB AND SOUTH OF HATTIESBURG.

ELSEWHERE OVER SOUTHEAST LOUISIANA AND SOUTH MISSISSIPPI...PATCHY LIGHT RAIN
AND LIGHT DRIZZLE...TOO LIGHT TO DETECTED BY RADAR WAS OCCURRING.

THE THUNDERSTORMS WERE MOVING NNORTHEAST AT 35 MILES AN HOUR.
Special weather statement, Jan 11, 12:44 AM CST, 3 hours 14 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-110830-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1244 AM CST MON JAN 11 1993

AT 1225 AM...A CLUSTER OF STRONG THUNDERSTORMS WITH HEAVY RAINFALL HAD JUST
PASSED TO THE EAST OF SLIDELL AND EXTENDED FROM BAY ST LOUIS MISSISSIPPI
SOUTH INTO BRETON SOUND.  OTHER WIDELY SCATTERED THUNDERSTORMS WERE IN
SOUTHEAST LOUISIANA FROM JUST SOUTH OF NEW ORLEANS TO BETWEEN HOUMA AND
GRAND ISLE.

SOME LOCALIZED STREET FLOODING HAS BEEN REPORTED IN THE CHALMETTE AREA AND
IN AND AROUND THE NEW ORLEANS AND SLIDELL AREAS.  MOTORIST SHOULD REMAIN
ALERT FOR FLOODING OF STREETS AND UNDERPASSES.  STONG GUSTY WINDS WILL BE
EXPERIENCED IN SOME OF THE STRONGER THUNDERSTORMS.

THE THUNDERSTORMS WERE OCCURRING WITHIN AREAS OF MOSTLY LIGHT RAIN THAT
COVERED MUCH OF SOUTHEAST LOUISIANA AND SOUTHEAST MISSISSIPPI.

SHOWERS AND PATCHES OF RAIN WERE DEVELOPING BETWEEN LAFAYETTE AND BATON
ROUGE.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.
Special weather statement, Jan 11, 1:46 AM CST, 2 hours 12 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-110930-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
144 AM CST MON JAN 11 1993

AT 125 AM...A CLUSTER OF STRONG THUNDERSTORMS WITH HEAVY RAINFALL CONTINUED
BETWEEN SLIDELL AND BAY ST LOUIS MISSISSIPPI AND EXTENDED SOUTH INTO LAKE
BORGNE.  OTHER WIDELY SCATTERED THUNDERSTORMS WERE 25 MILES NORTHWEST OF
GRAND ISLE AND OVER THE SOUTHERN PART OF LAKE PONTCHARTRAIN.

THE THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL THAT WILL PRODUCE STREET
FLOODING AND FLOODING OF LOW LYING AREAS.  MOTORIST SHOULD REMAIN ALERT
AND NOT DRIVE THROUGH FLOODED AREAS.  ALSO...STONG GUSTY WINDS AND DANGEROUS
LIGHTNING WILL BE EXPERIENCED IN SOME OF THE STRONGER THUNDERSTORMS.

THE THUNDERSTORMS WERE OCCURRING WITHIN AREAS OF MOSTLY LIGHT RAIN THAT
COVERED EXTREME SOUTHEAST LOUISIANA AND A LARGE PART SOUTHEAST MISSISSIPPI.

SHOWERS AND PATCHES OF RAIN CONTINUED TO DEVELOP BETWEEN THE BATON ROUGE
AREA SOUTHWEST TO VERMILION BAY.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 11, 2:40 AM CSTFlash Flood WarningLIXOrleans, Saint Tammany4 hr

Nearby

Flash Flood Warnings in Louisiana, 1993Every flash flood warning in 1993

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.