Alert archive / Louisiana / Tornado Warnings in 2003

Tornado Warning 7, NWS New Orleans, LA

April 7, 20034 parishes in Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 7, 2003, 1:23 PM CDT for 4 parishes in Louisiana. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 7, 2003, 1:23 PM CDT (18:23 UTC)
Expired
Apr 7, 2003, 2:00 PM CDT
In force
37 min
Issued by
NWS New Orleans, LA
Area
Counties, with a storm outline in the text

Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA, Saint James Parish, LA

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 7, 10:05 AM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.4 hours before the alert went out and 133 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 2003-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1394 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 2003-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 square meters per square second.19395878Sfc1 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
1394 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
592 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
212 m²/s²
Significant tornado parameter
1.2
Supercell composite
8.4

Open this sounding in Storm Lab

The text

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

041 
WFUS54 KLIX 071823
TORNEW
LAC005-007-047-093-071900-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
122 PM CDT MON APR 7 2003

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  ASCENSION PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF...GONZALES...DONALDSONVILLE
  ASSUMPTION PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITY OF NAPOLEONVILLE
  IBERVILLE PARISH IN SOUTHEAST LOUISIANA
  ST. JAMES PARISH IN SOUTHEAST LOUISIANA

* UNTIL 200 PM CDT

* AT 117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES SOUTH OF WHITE
  CASTLE...OR ABOUT 10 MILES WEST OF DONALDSONVILLE...MOVING EAST 
AT   35 MPH. LARGE HAIL TO THE SIZE OF GOLFBALLS CAN ALSO EXPECTED.

* THE TORNADO IS EXPECTED TO BE NEAR...
   DONALDSONVILLE AT 130 PM CDT
   GEISMER AT 135 PM CDT
   PRAIRIEVILLE AT 140 PM CDT
   GONZALES...CONVENT AT 145 PM CDT
   SORRENTO AT 150 PM CDT

SEEK SHELTER ON THE LOWEST FLOOR OF A BUILDING IN AN INTERIOR HALLWAY
OR ROOM SUCH AS A CLOSET OR BATHROOM.

IF IN MOBILE HOMES OR VECHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3026 9135 2985 9109 3002 9071 3031 9090

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 7, 9:23 AM CDTSevere Thunderstorm WarningLIXWashington37 min
Apr 7, 9:56 AM CDTSevere Thunderstorm WarningLIXWashington49 min
Apr 7, 12:31 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston44 min
Apr 7, 12:56 PM CDTSevere Thunderstorm WarningLIXAssumption, Iberville49 min
Apr 7, 1:10 PM CDTSevere Thunderstorm WarningLIXLivingston50 min
Apr 7, 1:34 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa41 min
Apr 7, 1:44 PM CDTTornado WarningLIXSaint Tammany, Tangipahoa31 min
Apr 7, 1:57 PM CDTTornado WarningLIXAscension, Livingston33 min
Apr 7, 2:00 PM CDTSpecial Marine WarningLIX2 hr
Apr 7, 2:12 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington48 min
Apr 7, 2:54 PM CDTSpecial Marine WarningLIX66 min
Apr 7, 2:57 PM CDTSevere Thunderstorm WarningLIXSaint Tammany33 min
Apr 7, 3:05 PM CDTSevere Thunderstorm WarningLIXAssumption, Lafourche, Terrebonne55 min
Apr 7, 3:30 PM CDTTornado WarningLIXAssumption30 min
Apr 7, 3:55 PM CDTSevere Thunderstorm WarningLIXLafourche, Saint James, Saint John the Baptist65 min
Apr 7, 4:09 PM CDTSpecial Marine WarningLIX96 min
Apr 7, 4:35 PM CDTSevere Thunderstorm WarningLIXSaint Charles40 min
Apr 7, 4:48 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard57 min
Apr 7, 4:52 PM CDTSevere Thunderstorm WarningLIXAssumption, Iberville38 min
Apr 7, 5:40 PM CDTSpecial Marine WarningLIX65 min
Apr 7, 6:40 PM CDTSpecial Marine WarningLIX65 min
Apr 7, 6:40 PM CDTSpecial Marine WarningLIX65 min

Nearby

Tornado Warnings in Louisiana, 2003Every tornado warning in 2003Tornadoes in 2003

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.