Alert archive / Louisiana / Flash Flood Warnings in 1995

Flash Flood Warning 34, NWS New Orleans, LA

May 9, 1995Jefferson Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at May 9, 1995, 11:20 AM CDT for Jefferson Parish, Saint Charles Parish, Louisiana. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 9, 1995, 11:20 AM CDT (16:20 UTC)
Expired
May 9, 1995, 3:15 PM CDT
In force
4 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Jefferson Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.3 hours before the alert went out and 72 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 1995-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1490 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1995-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 145 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
1490 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
583 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 091624
FFWNEW
LAC051-071-089-092015-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1120 AM CDT TUE MAY 9 1995
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING    EFFECTIVE UNTIL  315 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATIONS...
 
IN SOUTHEAST LOUISIANA
 
   ...JEFFERSON PARISH...ORLEANS PARISH...ST.CHARLES PARISH
 
AT 1115 AM CDT THE NATIONAL WEATHER SERVICE DROPPLER RADAR INDICATED
SEVERAL CLUSTERS OF THUNDERSTORMS WITH VERY HEAVY RAIN EXTENDING FROM
EAST NEW ORLEANS SOUTHWEST TO NEAR PARIDIS IN ST. CHARLES PARISH. EVEN
THOUGH THE THUNDERSTORMS ARE MOVING TO THE NORTHEAST AT 30 MPH THEY
CONTINUE TO REDEVELOP OVER THE SAME GENERAL AREA.
 
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

Local storm report, May 9, 10:24 AM CDT, 56 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE BATON ROUGE LA
1025 PM CDT TUE MAY 9 1995

TIME/CDT  PARISH/LOCATION        ...REPORTS FOR MAY 8...

1120 AM   ST. LANDRY         LARGE TREE LIMBS DOWN ON POWER LINES,
TO                           SEVERAL TREES DOWN BETWEEN PLAISANCE
1200 PM                      AND OPELOUSAS.  LARGE POWER OUTAGE
                             IN OPELOUSAS...REPORTED BY ELECTRIC
                             COMPANY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:27 PM CDTSevere Thunderstorm WarningLIXLafourche, Saint Charles63 min
May 8, 7:27 PM CDTSevere Thunderstorm WarningLIXTerrebonne63 min
May 8, 10:44 PM CDTSevere Thunderstorm WarningLIXOrleans, Saint Bernard61 min
May 8, 11:22 PM CDTFlash Flood WarningLIXLafourche, Terrebonne2 hr
May 8, 11:43 PM CDTSevere Thunderstorm WarningLIXSaint Tammany62 min
May 8, 11:43 PM CDTSevere Thunderstorm WarningLIXOrleans62 min
May 8, 11:50 PM CDTFlash Flood WarningLIXJefferson, Saint Charles4 hr
May 8, 11:50 PM CDTFlash Flood WarningLIXOrleans, Plaquemines, Saint Bernard4 hr
May 9, 12:36 AM CDTSevere Thunderstorm WarningLIXSaint Tammany69 min
May 9, 3:19 AM CDTFlash Flood WarningLIXSaint Tammany4 hr
May 9, 4:29 AM CDTSevere Thunderstorm WarningLIXSaint Tammany61 min
May 9, 7:08 AM CDTFlash Flood WarningLIXSaint Tammany4 hr
May 9, 7:21 AM CDTFlash Flood WarningLIXOrleans, Plaquemines, Saint Bernard4 hr
May 9, 7:21 AM CDTFlash Flood WarningLIXJefferson, Saint Charles4 hr
May 9, 10:55 AM CDTFlash Flood WarningLIXSaint Tammany3 hr
May 9, 11:20 AM CDTFlash Flood WarningLIXOrleans4 hr

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.