Alert archive / Louisiana / Flash Flood Warnings in 1997

Flash Flood Warning 13, NWS New Orleans, LA

April 27, 1997Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Apr 27, 1997, 12:29 PM CDT for Terrebonne 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
Apr 27, 1997, 12:29 PM CDT (17:29 UTC)
Expired
Apr 27, 1997, 2:30 PM CDT
In force
2 hr
Issued by
NWS New Orleans, LA
Area
Whole counties

County Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 5.5 hours before the alert went out and 150 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 1997-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 172 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 12:00Z on 1997-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 462 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
172 J/kg
Mixed-layer CIN
-153 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
462 m²/s²
0-3 km storm-relative helicity
568 m²/s²
Significant tornado parameter
0.0
Supercell composite
5.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 271733
FFWNEW
LAC109-271930-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD AND COASTAL FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1229 PM CDT SUN APR 27 1997
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
FLASH FLOOD AND COASTAL FLOOD WARNING EFFECTIVE UNTIL 230 PM CDT
FOR RESIDENTS IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST LOUISIANA
 
   ...TERREBONNE PARISH
 
AT 1215 PM CDT...TERREBONNE PARISH OFFICIALS REPORTED EXTENSIVE FLOODING
OCCURRING ACROSS THE LOWER PART OF THE PARISH DUE PARTLY TO STRONG
SOUTHERLY WINDS AND HEAVY RAINFALL. HIGHWAYS GENERALLY SOUTH OF HOUMA
DOWN TO COCODRIE WILL LIKELY BE IMPASSIBLE THIS AFTERNOON AS DRAINAGE
WILL BE INHIBITED DUE TO THE STRONG SOUTH WIND.
 
ALSO ADDITIONAL THUNDERSTORM ACTIVITY IS ANTICIPATED TO DEVELOP
THROUGHOUT THE AFTERNOON. TWO INCHES OF RAINFALL PER HOUR WILL BE COMMON
WITH ANY OF THE STORMS...THUS MAKING A HIGH POTENTIAL FOR ADDITIONAL
FLOODING TO OCCUR IN THE NORTHERN PART OF THE PARISH.
 
 
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 SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 10:57 PM CDTSevere Thunderstorm WarningLIXPointe Coupee33 min
Apr 26, 11:15 PM CDTSevere Thunderstorm WarningLIXWest Feliciana30 min
Apr 27, 12:44 AM CDTSevere Thunderstorm WarningLIXPointe Coupee46 min
Apr 27, 1:15 AM CDTSevere Thunderstorm WarningLIXWest Feliciana30 min
Apr 27, 1:33 AM CDTSevere Thunderstorm WarningLIXWest Feliciana27 min
Apr 27, 1:40 AM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana20 min
Apr 27, 1:53 AM CDTSevere Thunderstorm WarningLIXEast Feliciana, West Feliciana37 min
Apr 27, 2:33 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana42 min
Apr 27, 3:24 AM CDTFlash Flood WarningLIXEast Feliciana, Pointe Coupee, West Feliciana3 hr
Apr 27, 3:50 AM CDTFlash Flood WarningLIXEast Feliciana, Pointe Coupee, West Feliciana3 hr
Apr 27, 8:59 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Iberville, West Baton Rouge61 min
Apr 27, 9:32 AM CDTSevere Thunderstorm WarningLIXAscension, Livingston58 min
Apr 27, 9:32 AM CDTSevere Thunderstorm WarningLIXSaint Helena58 min
Apr 27, 10:38 AM CDTFlash Flood WarningLIXIberville4 hr
Apr 27, 10:38 AM CDTFlash Flood WarningLIXEast Feliciana4 hr
Apr 27, 10:46 AM CDTFlash Flood WarningLIXIberville4 hr
Apr 27, 10:46 AM CDTFlash Flood WarningLIXEast Feliciana4 hr
Apr 27, 11:09 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington66 min

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.