Alert archive / Louisiana / Flash Flood Warnings in 1997

Flash Flood Warning 27, NWS New Orleans, LA

November 29, 1997Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Nov 29, 1997, 12:56 AM CST for Saint Tammany Parish, Louisiana. It was in force for 2 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
Nov 29, 1997, 12:56 AM CST (06:56 UTC)
Expired
Nov 29, 1997, 3:00 AM CST
In force
2 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, 6.9 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 00:00Z on 1997-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 72 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 1997-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
72 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 290657
FFWNEW
LAC103-290900-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1256 AM CST SAT NOV 29 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  300 AM CST
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...SOUTHEASTERN ST. TAMMANY PARISH
 
AT 1250 AM CST...RADAR INDICATED THUNDERSTORMS PRODUCING VERY HEAVY
RAINFALL ACROSS THE SLIDELL AND PEARL RIVER AREAS. THESE STORMS WERE
MOVING TO THE NORTHEAST AT 35 MPH...HOWEVER NEW STORMS CONTINUED TO
DEVELOP OVER LAKE PONTCHARTRAIN.
 
EXTENSIVE STREET FLOODING WAS REPORTED ON GAUSE ROAD AND CAMELIA DRIVE
IN SLIDELL. THESE AREAS ARE PRONE TO FLOODING BUT THE FLOODING MAY
SPREAD TO OTHER AREAS NOT NORMALLY AFFECTED. FALLEN LEAVES AND DEBRIS
WILL HINDER DRAINAGE ALONG WITH HEAVY RAINFALL RATES OF 2 INCHES PER
HOUR THROUGH 2 AM. SOME RESIDENCES AND BUSINESSES MAY BECOME THREATENED
FROM RISING WATER...PARTICULARLY ALONG GAUSE ROAD AND OLD TOWN SECTIONS
OF SLIDELL.
 
RAINFALL AMOUNTS AROUND THE SLIDELL AND PEARL RIVER AREAS COULD TOTAL
BETWEEN 3 AND 5 INCHES BEFORE ENDING LATER THIS MORNING.
 
BE ESPECIALLY CAUTIOUS AT zNIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&

Nearby

Flash Flood Warnings in Louisiana, 1997Every flash flood warning in 1997

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.