Alert archive / Louisiana / Flash Flood Warnings in 1998

Flash Flood Warning 40, NWS New Orleans, LA

September 13, 1998Lafourche Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Sep 13, 1998, 10:19 AM CDT for Lafourche 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Sep 13, 1998, 10:19 AM CDT (15:19 UTC)
Expired: Sep 13, 1998, 1:00 PM CDT
In force: 3 hr
Issued by: NWS New Orleans, LA
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Lafourche Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.3 hours before the alert went out and 102 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 221 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 734 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 58 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 
TTAA00 KNEW 131536 COR
FFWNEW
LAC057-131800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED EXPIRATION TIME IN HEADER
NATIONAL WEATHER SERVICE NEW ORLEANS-BATON ROUGE LA
1019 AM CDT SUN SEP 13 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

   * FLASH FLOOD WARNING FOR...
     LAFOURCHE PARISH IN LOUISIANA

   * UNTIL 1 PM CDT

   * AT 959 AM CDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
     RAIN OVER MOST OF LAFOURCHE PARISH WITH MORE RAINFALL MOVING    
     INTO THE PARISH FROM THE GULF OF MEXICO.

REPORTS FROM LAW ENFORCEMENT IN THE AREA INDICATE SOME ROADS ARE 
BECOMING IMPASSABLE. THE SITUATION IS ALSO BEING AGGRAVATED BY HIGH WATER
ALONG THE COAST COMBINED WITH LEVEE EROSION.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATI,ONAL WEATHER SERVICE FORECAST OFFICE.

LAT...LON 2989 9079 2976 9063 2919 9020 2924 9004
          2989 9052

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 13, 4:00 AM CDT	Flash Flood Warning	LIX	Jefferson, Orleans	2 hr
Sep 13, 4:40 AM CDT	Flash Flood Warning	LIX	Plaquemines	80 min

Nearby

Flash Flood Warnings in Louisiana, 1998 Every flash flood warning in 1998

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.