Alert archive / Louisiana / Flash Flood Warnings in 1992

Flash Flood Warning 7, NWS New Orleans, LA

December 16, 1992Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Dec 16, 1992, 2:31 PM CST for Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Dec 16, 1992, 2:31 PM CST (20:31 UTC)
Expired
Dec 16, 1992, 5:30 PM CST
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 49 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 12:00Z on 1992-12-16Temperature 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 12:00Z on 1992-12-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
787 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
200 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 162043 COR
FFWNEW
LAC051-057-071-075-087-103-109-162330-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED FOR TYPOS
NATIONAL WEATHER SERVICE NEW ORLEANS LA
231 PM CST WED DEC 16 1992

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING
EFFECTIVE UNTIL  530 PM CST
FOR RESIDENTS IN THE FOLLOWING PARISHESS...

IN SOUTHEAST LOUISIANA

   ...JEFFERSON PARISH...SOUTHERN LAFOURCHE PARISH
   ...ORLEANS PARISH...NORTHERN PLAQUEMINES PARISH...ST.BERNARD PARISH
   ...SOUTHERN ST.TAMMANY PARISH...SOUTHERN TERREBONNE PARISH

WEATHER SERVICE RARAR SHOWED A LARGE STATIONARY AREA OF RAIN WITH
EMBEDDED SCATTERED THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM
SLIDELL ACROSS THE NEW ORLEANS METROPOLITAN AREA...SOUTHERN LAFOURCHE
AND TERREBONNE PARISHES.

BETWEEN 2 AND 3 INCHES OF RAIN HAS FALLEN OVER THIS AREA DURING THE LAST
FEW HOURS AND AN ADDITIONAL 3 INCHES OF RAIN IS POSSIBLE IN THE NEXT
FEW HOURS. STREET FLOODING IS OCCURING ON THE WEST BANK OF JEFFERSON
PARISH AND IN THE CITY OF NEW ORLEANS AT THIS TIME.

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 dLOW 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, Dec 16, 1:44 PM CST, 47 minutes before
LAZ008>010-012>014-MSZ010>014-ALZ016-162100-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
145 PM CST WED DEC 16 1992

A CLUSTER OF SHOWERS THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUED ACROSS
THE METROPOLITAN NEW ORLEANS AREA. THE HEAVY RAINFALL WILL SPREAD NORTHEAST
INTO SOUTHERN ST. TAMMANY PARISH DURING THE NEXT HOUR.

PEOPLE IN THE AREA...ESPECIALLY MOTORISTS...ARE ADVISED THAT FLOODING OF
STREETS...UNDERPASSES...AND LOW LYING AREAS WILL OCCUR WITH THESE STORMS
AND YOU SHOULD AVOID DRIVING THROUGH FLOODED AREAS.

ELSEWHERE...SCATTERED SHOWERS AND THUNDERSTORMS...SOME WITH HEAVY RAIN...
CONTINUED ACROSS MUCH OF SOUTHEAST LOUISIANA AND EXTENDED NORTHEAST INTO
SOUTHEAST MISSISSIPPI.

THE SHOWERS AND THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MILES AN HOUR.

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 16, 2:31 PM CSTFlash Flood WarningLIXJefferson, Lafourche, Terrebonne3 hr
Dec 16, 2:31 PM CSTFlash Flood WarningLIXSaint Tammany3 hr

Nearby

Flash Flood Warnings in Louisiana, 1992Every flash flood warning in 1992

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.