Alert archive / Louisiana / Tornado Warnings in 1990

Tornado Warning 17, NWS New Orleans, LA

August 30, 1990Iberia Parish, Saint Martin Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Aug 30, 1990, 8:28 PM CDT for Iberia Parish, Saint Martin Parish, Louisiana. It was in force for 62 min.

The area

The counties it named.

The facts

Issued: Aug 30, 1990, 8:28 PM CDT (01:28 UTC)
Expired: Aug 30, 1990, 9:30 PM CDT
In force: 62 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Iberia Parish, LA, Saint Martin Parish, LA

The radar

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

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.5 hours before the alert went out and 146 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: 4254 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 1289 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 86 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 14.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 310129
TORNEW
LAC045-099-310230-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
828 PM CDT THU AUG 30 1990
 
THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  930 PM CDT
FOR RESIDENTS IN THE FOLLOWING PARISHES
 
IN SOUTHEAST LOUISIANA
 
   ...IBERIA PARISH...ST.MARTIN PARISH
 
AND THE ADJACENT COASTAL WATERS OF SOUTHEAST LOUISIANA.
 
AT 825 PM NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM OVER ST. MARTIN PARISH AND EXTREME NORTHWEST IBERIA
PARISH. A FUNNEL CLOUD HAS BEEN REPORTED WITH THIS THUNDERSTORM JUST
SOUTHWEST OF LAFAYETTE AT 815 PM CDT. THE THUNDERSTORM WAS MOVING
SOUTH SOUTHEAST AT 20 MPH.
 
 
 
IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE IS A
BASEMENT.  GET UNDER A WORKBENCH OR PIECE OF STURDY FURNITURE.
IF NO BASEMENT IS AVAILABLE...SEEK SHELTER IN AN INTERIOR ROOM
SUCH AS A CLOSET ON THE LOWEST FLOOR.  USE BLANKETSD...PILLOWS...
OR CUSHIONS TO COVER YOUR BODY.  AVOID WINDOWS.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 30, 3:44 PM CDT, 4 hours 44 minutes before

LAZ008>010-012>014-MSZ010>014-ALZ016-302200-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE NEW ORLEANS LA
340 PM CDT THU AUG 30 1990

...SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM CDT FOR ALL OF
SOUTHEAST LOUISIANA...

SCATTERED THUNDERSTORMS CONTINUED TO DEVELOP ACROSS SOUTHEAST LOUISIANA
AND SOUTH MISSISSIPPI FROM BETWEEN HAMMOND AND MCCOMB EAST BETWEEN
POPLARVILLE AND LAUREL AND CONTINUED EAST INTO SOUTHWEST ALABAM#A.

THE STRONGEST THUNDERSTORMS WERE LOCATED BETWEEN BOGALUSA LOUISIANA AND
HATTIESBURG MISSISSIPPI AND EXTENDED EAST TO THE MOBILE AREA.

MOVEMENT WAS SOUTHEAST AT 20 MILES AN HOUR.

Local storm report, Aug 30, 8:18 PM CDT, 10 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
815 PM CDT THU AUG 30 1990

SEVERE WEATHER REPORTS FOR AUG 30 OVER SE LOUISIANA

530PM CDT   ST. TAMMANY PARISH    HALF INCH HAIL REPORTED IN SLIDELL
                                  BY CITY POLICE AND AT NWSFO

525PM CDT   ST TAMMANY PARISH     TREES DOWNED BY WIND GUSTS IN
                                  MANDEVILLE...POLICE DEPT.

555PM CDT                         15 S MANDEVILLE WIND GUSTS TO 62 KTS
                                  ...71 MPH ON CAUSEWAY BRIDGE...NWS.

610PM CDT                         15 S MANDEVILLE WIND GUSTS TO 50 KTS
                                  63 MPH ON CAUSEWAY BRIDGE...NWS.

630-730PM  TANGIPAHOA PARISH      REPORTS OF TREES DOWN IN S PORTION
                                  OF PARISH..SHERIFFS OFFICE

645PM CDT  ORLEANS PARISH     LAKEFRONT ARPT...NEW...WIND GUST 45 KT
                              52 MPH

658PM CDT  ORLEANS PARISH6     N.O. INTERNATIONAL AIRPORT...MSY...WIND
                              GUST 45 KT...52 MPH.

700-730 PM  ST. CHARLES PARISH   POWER LINES DOWN IN SEVERAL
                                 COMMUNITIES...EOC.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 7:28 PM CDT	Severe Thunderstorm Warning	LIX	Livingston	62 min
Aug 30, 9:19 PM CDT	Severe Thunderstorm Warning	LIX	Ascension, Iberville	56 min
Aug 30, 9:29 PM CDT	Severe Thunderstorm Warning	LIX	Assumption	61 min
Aug 30, 9:47 PM CDT	Severe Thunderstorm Warning	LIX	St. Mary	58 min

Nearby

Tornado Warnings in Louisiana, 1990 Every tornado warning in 1990 Tornadoes 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; the sounding from the Mesonet's radiosonde archive.