Alert archive / Louisiana / Tornado Warnings in 1998

Tornado Warning 18, NWS New Orleans, LA

September 10, 1998Lafourche Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Sep 10, 1998, 6:27 PM CDT for Lafourche Parish, Saint Charles Parish, Louisiana. It was in force for 33 min. 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 10, 1998, 6:27 PM CDT (23:27 UTC)
Expired
Sep 10, 1998, 7:00 PM CDT
In force
33 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Lafourche Parish, LA, Saint Charles Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.5 hours before the alert went out and 89 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 1998-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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 1998-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 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
4 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
859 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
360 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 102327 RRA
TORNEW
LAC057-089-102355-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
627 PM CDT THU SEP 10 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A...

* TORNADO WARNING FOR
   - ST CHARLES PARISH IN SOUTHEASTERN LOUISIANA
   - EXTREME NORTHERN LAFOURCHE PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 700 PM CDT

* AT 622 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  PRODUCING A POSSIBLE TORNADO IN EXTREME NORTHERN LAFOURCHE PARISH
  ABOUT 8 MILES EAST OF RACELAND. THIS STORM PRODUCED DAMAGE TO A
  HOUSE NEAR CUTTOFF AT 620 PM ACCORDING TO THE LAFOURCE PARISH
  SHERIFFS OFFICE.

* THE STORM PRODUCING THE POSSIBLE TORNADO IS EXPECTED TO BE PASS
  NEAR DES ALLEMOND AND HAHNVILLE.

IF YOU ARE IN THESE AREAS...SEEK SHELTER IN A SMALL INTERIOR ROOM
AWAY FROM WINDOWS

IF YOU ARE IN THE PATH OF A TORNADO...GET UNDER A WORKBENCH OR PIECE
OF STURDY FURNITURE. SEEK SHELTER IN AN INTERIOR ROOM SUCH AS A
CLOSET ON THE LOWEST FLOOR.  USE BLANKETS...PILLOWS...OR CUSHIONS TO
COVER YOUR BODY.  AVOID WINDOWS.

&

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 10, 2:43 PM CDTSevere Thunderstorm WarningLIXSaint John the Baptist27 min

Nearby

Tornado Warnings in Louisiana, 1998Every tornado warning in 1998Tornadoes 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.