Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 9, NWS New Orleans, LA

January 2, 1999Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Jan 2, 1999, 8:09 AM CST for Saint Tammany Parish, Louisiana. It was in force for 16 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 2, 1999, 8:09 AM CST (14:09 UTC)
Expired: Jan 2, 1999, 8:25 AM CST
In force: 16 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Saint Tammany Parish, LA

The watch it was issued in

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

Issued	Product	Office	Lasted
Jan 2, 3:00 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.2 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-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: 549 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 331 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 021409 RRA
TORNEW
GMZ530-555-LAC103-021425-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
809 AM CST SAT JAN 2 1999

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

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

* UNTIL 825 AM CST

* AT 807 AM CST... DOPPLER RADAR INDICATED A POSSIBLE TORNADO 6
  MILES SOUTH OF SLIDELL MOVING NORTHEAST AT 45 MPH.

* THE TORNADO IS CURRENTLY EXPECTED TO
  MOVE NEAR THE RIGOLETS ESTATES
  PIRATES COVE
  AND SALT BAYOU AREAS NEAR SLIDELL

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.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 2, 4:38 AM CST	Tornado Warning	LIX	Pointe Coupee	32 min
Jan 2, 4:49 AM CST	Tornado Warning	LIX	West Feliciana	31 min
Jan 2, 5:36 AM CST	Tornado Warning	LIX	East Feliciana, Saint Helena	34 min
Jan 2, 6:26 AM CST	Tornado Warning	LIX	Tangipahoa, Washington	34 min
Jan 2, 6:56 AM CST	Severe Thunderstorm Warning	LIX	Lafourche, Saint Charles, Saint John the Baptist	34 min
Jan 2, 7:05 AM CST	Tornado Warning	LIX	Saint Charles, Saint John the Baptist	30 min
Jan 2, 7:53 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	32 min
Jan 2, 8:54 AM CST	Severe Thunderstorm Warning	LIX	Plaquemines	21 min

Nearby

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