Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 22, NWS New Orleans, LA

March 9, 1999Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Mar 9, 1999, 12:28 AM CST for Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 32 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: Mar 9, 1999, 12:28 AM CST (06:28 UTC)
Expired: Mar 9, 1999, 1:00 AM CST
In force: 32 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Saint Helena Parish, LA, Tangipahoa 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
Mar 8, 10:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 6.5 hours before the alert went out and 98 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: 230 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 476 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 224 m²/s²
0-3 km storm-relative helicity: 298 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 090628 RRA
TORNEW
LAC091-105-090700-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1228 AM CST TUE MAR 9 1999

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

* TORNADO WARNING FOR
   - ST HELENA PARISH IN SOUTHEASTERN LOUISIANA
   - NORTHERN TANGIPAHOA PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 100 AM CST

* AT 1225 AM CST... DOPPLER RADAR INDICATED A DEVELOPING TORNADO 5
  MILES EAST OF GREENSBURG MOVING EAST AT 45 MPH.

* THE TORNADO WILL AFFECT THE COMMUNITIES OF FLUKER AND TANGIPAHOA
  BY 1245 AM CST.

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
Mar 8, 10:56 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee	34 min
Mar 8, 11:17 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	33 min
Mar 9, 12:57 AM CST	Tornado Warning	LIX	Saint Helena	48 min
Mar 9, 1:06 AM CST	Tornado Warning	LIX	Tangipahoa	34 min
Mar 9, 1:43 AM CST	Severe Thunderstorm Warning	LIX	Saint Tammany	32 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.