Alert archive / Louisiana / Flash Flood Warnings in 1995

Flash Flood Warning 38, NWS New Orleans, LA

May 10, 1995Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 10, 1995, 1:24 AM CDT for Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
May 10, 1995, 1:24 AM CDT (06:24 UTC)
Expired
May 10, 1995, 4:30 AM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.4 hours before the alert went out and 55 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 1995-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3211 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 1995-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
3211 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
896 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 100627
FFWNEW
LAC103-105-100930-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
124 AM CDT WED MAY 10 1995
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING    EFFECTIVE UNTIL  430 AM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...ST.TAMMANY PARISH...SOUTHERN TANGIPAHOA PARISH
 
AT 1:15 AM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SCATTERED SHOWERS AND THUNDERSTORMS..SOME WITH LOCALLY HEAVY
RAINFALL..CONTINUE ACROSS ST. TAMMANY AND SOUTHERN TANGIPAHOA.
THESE THUNDERSTORMS WERE MOVING EAST-NORTHEAST AT 25 MILES PER
HOUR. THIS ACTIVITY IS EXPECTED TO CONTINUE FOR AT LEAST THE
NEXT TWO TO THREE HOURS.
 
DURING THE LAST THREE HOURS DOPPLER RADAR RAINFALL ESTIMATES
AROUND THREE INCHES OVER SOUTHERN TANGIPAHOA AND THREE TO FOUR
INCHES OVER SOUTHERN ST. TAMMANY.
 
RESIDENTS CAN EXPECT AN ADDITIONAL TWO TO THREE INCHES..WITH
LOCALLY HIGHER AMOUNTS..OVER THIS AREA DURING THE NEXT THREE
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 SHFOULD BE
ABANDONED QUICKLY.  MOVE 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

Local storm report, May 10, 1:12 AM CDT, 12 minutes before
PRELIMINARY LOCAL STORM REPORTS
NATIONAL WEATHER SERVICE NEW ORLEANS LA
115 AM CDT WED MAY 10 1995

TIME(CDT)  .....CITY LOCATION...... STATE ...EVENT/REMARKS...
           ....COUNTY LOCATION......

7 PM          NEW ORLEANS            LA   4 CONFIRMED DEATHS DUE TO
5/8/95        ORLEANS                     FLOODING.  REPORTED BY
 TO                                       ORLEANS EOC
4 AM
5/9/95
Local storm report, May 10, 1:15 AM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORTS
NATIONAL WEATHER SERVICE NEW ORLEANS LA
117 AM CDT WED MAY 10 1995

TIME(CDT)  .....CITY LOCATION...... STATE ...EVENT/REMARKS...
           ....COUNTY LOCATION......

7 PM          ST CHARLES PARISH      LA   3000 HOUSES SUSTAINED SOME
5/8/95                                    DAMAGE DUE TO FLOODING WHILE
 TO                                       1400 OF THESE HOUSES SUFFERED
4 AM                                      MAJOR DAMAGE.  REPORTED BY
5/9/95                                    ST CHARLES EOC

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 7:47 PM CDTSevere Thunderstorm WarningLIXSt. Mary58 min
May 9, 8:14 PM CDTSevere Thunderstorm WarningLIXWashington61 min
May 9, 8:16 PM CDTSevere Thunderstorm WarningLIXIberia, Saint Martin59 min
May 9, 8:17 PM CDTSevere Thunderstorm WarningLIXIberville58 min
May 9, 8:40 PM CDTSevere Thunderstorm WarningLIXAscension65 min
May 9, 9:06 PM CDTSevere Thunderstorm WarningLIXLivingston54 min
May 9, 9:25 PM CDTSevere Thunderstorm WarningLIXOrleans, Saint Tammany65 min
May 9, 11:12 PM CDTTornado WarningLIXOrleans, Saint Tammany63 min
May 10, 12:12 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, West Baton Rouge63 min
May 10, 1:12 AM CDTFlash Flood WarningLIXAscension, Livingston2 hr
May 10, 2:22 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa68 min
May 10, 4:26 AM CDTFlash Flood WarningLIXSaint Tammany, Tangipahoa4 hr
May 10, 8:04 AM CDTSevere Thunderstorm WarningLIXOrleans, Saint Bernard56 min
May 10, 11:13 AM CDTSevere Thunderstorm WarningLIXPlaquemines, Saint Bernard62 min
May 10, 3:30 PM CDTTornado WarningLIXAvoyelles, Saint Landry60 min
May 10, 3:53 PM CDTSevere Thunderstorm WarningLIXIberville, Saint Martin67 min
May 10, 4:36 PM CDTSevere Thunderstorm WarningLIXSaint Landry69 min

Nearby

Flash Flood Warnings in Louisiana, 1995Every flash flood warning in 1995

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.