Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 40, NWS New Orleans, LA

July 27, 1999East Baton Rouge Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jul 27, 1999, 5:00 PM CDT for East Baton Rouge Parish, Louisiana. It was in force for 30 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
Jul 27, 1999, 5:00 PM CDT (22:00 UTC)
Expired
Jul 27, 1999, 5:30 PM CDT
In force
30 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County East Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.0 hours before the alert went out and 138 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 1999-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1170 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 1999-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 square meters per square second.1939Sfc1 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
1170 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
927 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 272202
TORNEW
LAC033-272230-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
500 PM CDT TUE JUL 27 1999

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

* TORNADO WARNING FOR
   - EAST BATON ROUGE PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 530 PM CDT

* AT 456 PM CDT... NATIONAL WEATHER SERVICE
COOPERATIVE OPBSERVER REPORTED A TORNADO NEAR SOUTHEAST BATON
ROUGE APPROACHING HIGHLAND ROAD AND MOVING WEST AT 10 MPH.

* SOME LOCATIONS IN AND NEAR THE PATH OF THIS TORNADO ARE...
  BATON ROUGE BETWENN 5 AND 530 PM CDT

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...GETf 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.


&

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.

NWS New Orleans, LA wrote its last area forecast discussion before this tornado warning went out at Jul 27, 2:08 PM CDT, 2 hours 52 minutes earlier.

Area forecast discussion, Jul 27, 2:08 PM CDT, 2 hours 52 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS/BATON ROUGE LA
200 PM TUE JUL 27 1999

NO SIGNIFICANT CHANGE IN THE OVERALL SYNOPTIC PATTERN AS INDICATED
BY THE CURRENT MODELS.  ALL MODELS STILL HOLDING THE UPPER LEVEL
RIDGE ROUGHLY IN TACT THROUGH THE FORECAST PERIOD.  THE
MODELS...ALONG WITH HPC SFC PROG GUIDANCE...HOLD THE SFC HIGH IN
PLACE OVER THE SE THROUGH SUN AS WELL.  ONE OF THE MOST INTERESTING
FEATURES IS THE ETA AND THE NGM ALL BUT DRY THE AREA OUT BY WED PM.
ALTHOUGH WITH RELATIVELY WEAK QPF VALUES INDICATED...THE AVN STILL
WANTS TO HOLD SOME PRECIP OVER THE AREA THROUGH THU ALTHOUGH THE
LACK OF AVAILABLE ENERGY WOULD SUGGEST OTHERWISE.  AVN GUIDANCE VALUES
DICTATE THIS AS WELL.  WILL ULTIMATELY TREND TOWARD THE NGM AND ETA
HANDLING OF THE PRECIP FOR THIS PACKAGE.  BOTH MODELS BRING UPPER
LEVEL DISTURBANCES INTO THE AREA THIS AFTERNOON AND TONIGHT.  ALONG
WITH DIFF HEATING...THIS SHOULD BE THE PRIMARY FOCUS FOR ANY
CONVECTION LEADING INTO THIS EVENING.  BOTH ARE CONSISTENT AS WELL
PULLING THESE DISTURBANCES TOWARD THE WEST AND CREATING MORE OF AN
OPEN FLOW BY WED.  WILL LEAVE ISOLATED AND WIDELY SCATTERED IN THE
FORECAST FOR WED AND THU AFTERNOON TO ACCOUNT FOR ANY CONVECTION AS
A RESULT OF DAYTIME HEATING.  WILL DEVIATE LITTLE FROM THE EXTENDED
ZONES FORECAST AS ONCE AGAIN...LITTLE CHANGE IN THE SYNOPTIC FLOW
SUGGEST NOTHING SIGNIFICANT AFFECTING CONDITIONS HERE THROUGH SUN.
0
MCB 72/95/73/95 1101    BTR 75/94/76/95 1202    MSY 75/95/76/96 1202
BIX 79/93/80/94 1202

.NEW...NONE
LA...NONE
MS...NONE.

09

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 4:12 PM CDTSevere Thunderstorm WarningLIXAscension, Saint James, Saint John the Baptist38 min
Jul 27, 4:45 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, Iberville, West Baton Rouge65 min

Nearby

Tornado Warnings in Louisiana, 1999Every tornado warning in 1999Tornadoes in 1999

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.