Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 16, NWS New Orleans, LA

January 29, 1999Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jan 29, 1999, 4:51 PM CST for Saint Tammany Parish, Louisiana. It was in force for 34 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
Jan 29, 1999, 4:51 PM CST (22:51 UTC)
Expired
Jan 29, 1999, 5:25 PM CST
In force
34 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Saint Tammany Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 10.9 hours before the alert went out and 30 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 1999-01-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 664 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 1999-01-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
664 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
486 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.2
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 292249 RRA
TORNEW
LAC103-292325-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
451 PM CST FRI JAN 29 1999

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

* TORNADO WARNING FOR
   - NORTHERN ST TAMMANY PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 525 PM CST

* AT 449 PM CST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  WITH A POSSIBLE TORNADO 8 MILES NORTH OF COVINGTON OR 4 MILES
  SOUTHEAST OF FOLSOM MOVING NORTHEAST AT 35 MPH.

* THE TORNADO IS CURRENTLY EXPECTED TO REMAIN OVER RURAL AREAS
AROUND FOLSOM.

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.

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, Jan 29, 11:00 AM CST, 5 hours 51 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-292330-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1100 AM CST FRI JAN 29 1999

WIDESPREAD SHOWERS AND A FEW THUNDERSTORMS ARE EXPECTED ACROSS
SOUTHEAST LOUISIANA AND EXTREME SOUTH MISSISSIPPI THIS AFTERNOON AND
TONIGHT. THE MAIN THREAT WILL BE HEAVY RAIN. HOWEVER...SEVERE
THUNDERSTORMS ARE NOT EXPECTED THIS AFTERNOON OR TONIGHT.

GULF MOISTURE WILL REMAIN ENTRENCHED AND THE ATMOSPHERE IS MODERATELY
UNSTABLE OVER THE AREA. THE UPPER LEVEL LOW AND SURFACE LOW WILL
REMAIN OVER TEXAS THROUGH TONIGHT. STRONG UPPER LEVEL WINDS...WHICH
HELP PRODUCE AND PROLONG STRONG AND SEVERE THUNDERSTORMS...WILL
REMAIN OVER TEXAS THROUGH TONIGHT. A SLIGHT CHANCE OF SEVERE
WEATHER MAY OCCUR SATURDAY AS THESE WEATHER FEATURES MOVE CLOSER.

ACTIVATION OF STORM SPOTTERS...EMERGENCY MANAGEMENT PERSONNEL...AND
HAM RADIO OPERATORS WILL NOT BE REQUIRED THROUGH TONIGHT. HOWEVER...
RAINFALL REPORTS CAN BE RELAYED TO THE NATIONAL WEATHER SERVICE.

18

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 29, 2:05 PM CSTSevere Thunderstorm WarningLIXEast Baton Rouge, West Baton Rouge45 min
Jan 29, 2:54 PM CSTTornado WarningLIXEast Baton Rouge, Livingston36 min
Jan 29, 5:16 PM CSTTornado WarningLIXWashington64 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.