Alert archive / Louisiana / Flash Flood Warnings in 1993

Flash Flood Warning 21, NWS New Orleans, LA

January 21, 1993Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jan 21, 1993, 12:43 AM CST for Saint Tammany Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 21, 1993, 12:43 AM CST (06:43 UTC)
Expired
Jan 21, 1993, 3:45 AM CST
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.7 hours before the alert went out and 30 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 1993-01-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 334 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, Slidell Radar S, LA at 00:00Z on 1993-01-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 431 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
334 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
518 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
431 m²/s²
0-3 km storm-relative helicity
463 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 210647
FFWNEW
LAC103-210945-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1243 AM CST THU JAN 21 1993
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLOOD WARNING        EFFECTIVE UNTIL  345 AM CST
FOR RESIDENTS IN THE FOLLOWING PARISHES...
 
IN SOUTHEAST LOUISIANA
 
   ...ST.TAMMANY PARISH
 
AT 1230PM NATIONAL WEATHER SERVICE RADAR INDICATED AREAS OF RAIN AND A
FEW HEAVY SHOWERS OVER ST TAMMANY PARISH. THE AREA OF RAIN WAS MOVING
EASTWARD AND SHOULD CONTINUE TO DECREASE IN INTENSITY BEFORE ENDING BY
DAYBREAK. ST TAMMANY PARISH SHERIFFS OFFICE REPORTED THAT A FEW SECONARY
ROADWAYS REMAINED FLOODED EARLY THIS MORNING...MAINLY IN THE NORTH
PORTION. FLOODING IN LOW LYING AREAS WILL SLOWLY SUBSIDE DURING THE
MORNING AS THE RAIN DECREASES.
 
 
MOST DEATHS IN FLASH FLOODING 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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 20, 6:36 PM CSTFlash Flood WarningLIXSaint Martin4 hr
Jan 20, 6:36 PM CSTFlash Flood WarningLIXTangipahoa, Washington4 hr
Jan 20, 9:44 PM CSTFlash Flood WarningLIXSaint Tammany3 hr
Jan 20, 10:54 PM CSTSevere Thunderstorm WarningLIXSaint Tammany, Washington66 min
Jan 20, 11:14 PM CSTFlash Flood WarningLIXTangipahoa, Washington4 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.