Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 33, NWS New Orleans, LA

May 27, 1999Plaquemines Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 27, 1999, 5:00 PM CDT for Plaquemines Parish, Louisiana. It was in force for 45 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
May 27, 1999, 5:00 PM CDT (22:00 UTC)
Expired
May 27, 1999, 5:45 PM CDT
In force
45 min
Issued by
NWS New Orleans, LA
Area
Whole counties

County Plaquemines Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 10.0 hours before the alert went out and 310 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, Jackson, MS at 12:00Z on 1999-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 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, Jackson, MS at 12:00Z on 1999-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -53 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
15 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
705 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-53 m²/s²
0-3 km storm-relative helicity
7 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KNEW 272200 RRA
TORNEW
LAC075-272245-

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

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

* TORNADO WARNING FOR
   - SOUTHERN PLAQUEMINES PARISH IN SOUTHEASTERN LOUISIANA

* UNTIL 545 PM CDT

* AT 453 PM CDT... DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS
  CAPABLE OF PRODUCING A TORNADO FROM PORT SULPHUR TO NEAR GRAND
  ISLE MOVING SOUTHEAST AT 15 MPH.

  SEVERAL REPORTS OF FUNNEL CLOUDS HAVE BEEN RECEIVED FROM THE
  POINTE A LA HACHE AREA AROUND 450 PM CDT.

* THE SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO WILL BE
  NEAR... BURAS AROUND 515 PM CDT.

IF YOU ARE CAUGXHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 3:17 PM CDTSevere Thunderstorm WarningLIXLafourche, Terrebonne48 min
May 27, 3:59 PM CDTSevere Thunderstorm WarningLIXLafourche31 min
May 27, 4:26 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche49 min
May 27, 4:36 PM CDTTornado WarningLIXJefferson, Plaquemines19 min
May 27, 4:36 PM CDTTornado WarningLIXLafourche19 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.