Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 39, NWS New Orleans, LA

February 10, 1998Saint Tammany Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Feb 10, 1998, 9:02 PM CST for Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 63 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Feb 10, 1998, 9:02 PM CST (03:02 UTC)
Expired
Feb 10, 1998, 10:05 PM CST
In force
63 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Saint Tammany Parish, LA, Washington Parish, LA

What was reported inside it

TimeReportWhereRemark
Feb 10, 9:45 PM CSTThunderstorm Wind 53Mandeville, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Feb 10, 4:45 PM CSTTornado WatchSPC5 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.0 hours before the alert went out and 51 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 1998-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 625 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 1998-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 399 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
625 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
399 m²/s²
0-3 km storm-relative helicity
500 m²/s²
Significant tornado parameter
1.4
Supercell composite
6.4

Open this sounding in Storm Lab

The text

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

552 
WUUS1 KNEW 110304 RRA
SVRNEW
LAC051-057-071-089-103-117-110405-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
902 PM CST TUE FEB 10 1998

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1005 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN SOUTHEASTERN LOUISIANA

   ...WASHINGTON PARISH
   ...ST TAMMANY PARISH
   ...ST CHARLES PARISH
   ...JEFFERSON PARISH
   ...ORLEANS PARISH
   ...LAFOURCHE PARISH

AT 9 PM CST RARAR SHOWED A LINE OF NUMEROUS THUNDERSTORMS EXTENDING
FROM JUST EAST OF KENTWOOD SOUTH TO LAKE MAUREPAS TO JUST WEST OF
HOUMA THEN DOWN TO THE GULF OF MEXICO MOVING EAST AT 35 MILES AN
HOUR.



A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 10, 6:00 PM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, West Baton Rouge60 min
Feb 10, 6:00 PM CSTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana60 min
Feb 10, 6:56 PM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena, West Baton Rouge64 min
Feb 10, 6:56 PM CSTSevere Thunderstorm WarningLIXWest Feliciana64 min
Feb 10, 7:38 PM CSTSevere Thunderstorm WarningLIXAscension, Assumption62 min
Feb 10, 8:00 PM CSTSevere Thunderstorm WarningLIXIberville65 min
Feb 10, 8:00 PM CSTSevere Thunderstorm WarningLIXLivingston, Saint John the Baptist, Tangipahoa65 min
Feb 10, 8:00 PM CSTSevere Thunderstorm WarningLIXSaint James65 min
Feb 10, 8:12 PM CSTSevere Thunderstorm WarningLIXLafourche, Terrebonne63 min
Feb 10, 9:02 PM CSTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Saint Charles63 min
Feb 10, 9:49 PM CSTSevere Thunderstorm WarningLIXPlaquemines, Saint Bernard66 min
Feb 10, 11:00 PM CSTSevere Thunderstorm WarningLIXPlaquemines60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1998Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.