Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 13, NWS New Orleans, LA

March 29, 1990Lafourche Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 29, 1990, 10:17 PM CST for Lafourche Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 58 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
Mar 29, 1990, 10:17 PM CST (04:17 UTC)
Expired
Mar 29, 1990, 11:15 PM CST
In force
58 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Lafourche Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Mar 29, 10:55 PM CSTThunderstorm Wind 0St. Charles, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.3 hours before the alert went out and 82 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 1990-03-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 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 1990-03-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 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
16 J/kg
Mixed-layer CIN
-222 J/kg
Mixed-layer LCL
1008 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
158 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 300418
SVRNEW
LAC057-089-095-109-300515-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1017 PM CST THU MAR 29 1990
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1115 PM CST
FOR RESIDENTS IN THE FOLLOWING PARISHES
 
IN SOUTHEAST LOUISIANA
 
   ...LAFOURCHE PARISH...ST.CHARLES PARISH...ST.JOHN.BAPTIST PARISH
   ...EASTERN TERREBONNE PARISH
 
AND THE ADJACENT COASTAL WATERS OF SOUTHEAST LOUISIANA.
 
 
SLIDELL RADAR AT 1013 PM CST INDICATED A LINE OF POSSIBLY SEVERE
THUNDERSTORMS ABOUT 10 MILES WIDE EXTENDING FROM THIBODAUX SOUTH TO
HOUMA TO ABOUT 15 MILES WEST OF COCODRIE. THIS LINE OF THUNDERSTORMS
IS MOVING EAST ABOUT 35 MPH WHILE IN INDIVIDUAL THUNDERSTORMS ARE
MOVING EASTNORTHEAST ABOUT 40 MPH. SOME WIND DAMAGE HAS BEEN REPORTED
IN SOME OF THE PARISHES WEST OF THIS LINE EARLY TONIGHT.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 29, 8:06 PM CSTSevere Thunderstorm WarningLIXIberia, Saint Martin, St. Mary69 min
Mar 29, 8:24 PM CSTSevere Thunderstorm WarningLIXSaint Landry51 min
Mar 29, 8:58 PM CSTSevere Thunderstorm WarningLIXIberville, Pointe Coupee62 min
Mar 29, 9:17 PM CSTSevere Thunderstorm WarningLIXAssumption, Lafourche, Saint James, Terrebonne58 min
Mar 29, 9:25 PM CSTSevere Thunderstorm WarningLIXWest Baton Rouge, West Feliciana65 min
Mar 29, 9:43 PM CSTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, East Feliciana62 min
Mar 29, 10:11 PM CSTSevere Thunderstorm WarningLIXLivingston, Saint Helena64 min
Mar 29, 10:17 PM CSTSevere Thunderstorm WarningLIXTerrebonne58 min
Mar 29, 10:34 PM CSTTornado WarningLIXLafourche26 min
Mar 29, 10:44 PM CSTTornado WarningLIXJefferson, Saint Charles61 min
Mar 29, 10:56 PM CSTTornado WarningLIXOrleans64 min
Mar 29, 11:24 PM CSTTornado WarningLIXSaint Tammany66 min
Mar 30, 12:22 AM CSTTornado WarningLIXSaint Tammany48 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1990Every severe thunderstorm warning in 1990

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.