Alert archive / Louisiana / Flash Flood Warnings in 2002

Flash Flood Warning 22, NWS New Orleans, LA

September 26, 2002Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Sep 26, 2002, 11:52 AM CDT for Saint Tammany Parish, Louisiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 26, 2002, 11:52 AM CDT (16:52 UTC)
Expired
Sep 26, 2002, 3:00 PM CDT
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 12:00Z, 4.9 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 12:00Z on 2002-09-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2002-09-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
42 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 
WGUS54 KLIX 261652
FFWNEW
LAC103-262000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1149 AM CDT THU SEP 26 2002

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF...SLIDELL...EDEN ISLE

* UNTIL 300 PM CDT

* AT 1145 AM CDT...AMATEUR RADIO WEATHER SPOTTERS REPORTED A SURGE 
  OF FLOOD WATERS FROM LAKE PONTCHARTRAIN INTO SOUTHERN PORTIONS 
  OF SLIDELL AND EDEN ISLE.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS...STREETS AND UNDERPASSES.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROAD.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED. MOVE TO HIGHER
GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.
1 follow-up statement
000 
WGUS74 KLIX 261739
FFSNEW
LAC103-262000-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1230 PM CDT THU SEP 26 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 PM CDT FOR
SAINT TAMMANY PARISH...

STRONG WESTERLY WINDS ON THE BACK SIDE OF TROPICAL ISIDORE HAVE
PUSHED TIDAL WATERS OF LAKE PONTCHARTRAIN ONTO THE EASTERN SHORES
OF SAINT TAMMANY PARISH. THE LEVEE JUST SOUTH OF SPARTAN TRACE
AND THE OTHER SIDE OF PONTCHARTRAIN DRIVE IN SLIDELL HAS BEEN
BREACHED AND TIDAL WATERS ARE RISING QUICKLY. STREETS IN THE PALM
LAKE COMMUNITY ARE IMPASSABLE. IN ADDITION...SEVERAL HOMES IN PALM
LAKE WERE INUNDATED WITH 2 FEET OF WATER WEDNESDAY NIGHT.

WESTERLY WINDS ARE EXPECTED TO CONTINUE THROUGH 2 PM BEFORE BECOMING
NORTHWEST.

MOTORISTS SHOULD NOT DRIVE INTO AREAS WHERE WATER IS COVERING THE
ROADWAY. THE ROAD MAY BE WASHED OUT OR THE DEPTH OF THE WATER WILL BE
UNKNOWN. IT ONLY TAKES A FEW INCHES OF MOVING WATER TO OVERTAKE A
VEHICLE.

STAY TUNED TO NOAA WEATHER RADIO...LOCAL TV OR RADIO FOR THE LATEST
STATEMENTS AND FLOOD WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 25, 8:59 PM CDTFlash Flood WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles6 hr
Sep 25, 11:41 PM CDTTornado WarningLIXJefferson, Lafourche109 min
Sep 25, 11:41 PM CDTTornado WarningLIXLafourche34 min
Sep 26, 12:20 AM CDTTornado WarningLIXTerrebonne40 min
Sep 26, 12:20 AM CDTTornado WarningLIXLafourche40 min
Sep 26, 1:06 AM CDTTornado WarningLIXLafourche24 min
Sep 26, 1:06 AM CDTTornado WarningLIXTerrebonne24 min
Sep 26, 1:35 AM CDTTornado WarningLIXTerrebonne7 days
Sep 26, 2:21 AM CDTTornado WarningLIXTerrebonne39 min
Sep 26, 3:22 AM CDTFlash Flood WarningLIXAssumption, Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard and 4 more4 hr
Sep 26, 7:41 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard3 hr
Sep 26, 8:24 AM CDTFlash Flood WarningLIXSaint Tammany3 hr
Sep 26, 10:56 AM CDTFlash Flood WarningLIXJefferson, Plaquemines, Saint Bernard2 hr
Sep 26, 1:30 PM CDTFlash Flood WarningLIXJefferson3 hr
Sep 26, 2:26 PM CDTFlash Flood WarningLIXSaint John the Baptist, Tangipahoa4 hr
Sep 26, 3:08 PM CDTFlash Flood WarningLIXSaint Tammany4 hr
Sep 26, 6:01 PM CDTFlash Flood WarningLIXLivingston, Saint John the Baptist, Saint Tammany, Tangipahoa6 hr

Nearby

Flash Flood Warnings in Louisiana, 2002Every flash flood warning in 2002

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.