Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 39, NWS New Orleans, LA

May 9, 2012Jefferson Parish, Lafourche Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 9, 2012, 3:19 PM CDT for Jefferson Parish, Lafourche Parish, Louisiana. It was in force for 13 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
May 9, 2012, 3:19 PM CDT (20:19 UTC)
Expired
May 9, 2012, 3:32 PM CDT
In force
13 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon

Counties Jefferson Parish, LA, Lafourche Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.3 hours before the alert went out and 114 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 2012-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1089 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 2012-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 square meters per square second.1939587897Sfc1 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
1089 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
911 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

191 
WFUS54 KLIX 092019
TORLIX
LAC051-057-092045-
/O.NEW.KLIX.TO.W.0039.120509T2019Z-120509T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
319 PM CDT WED MAY 9 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHEASTERN JEFFERSON PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 345 PM CDT

* AT 312 PM CDT...NOAA NOS EMPLOYEE ON GRAND ISLE REPORTED A FUNNEL 
CLOUD OVER CENTRAL GRAND ISLE...MOVING SOUTHEAST AT 15 MPH.

* THE TORNADO WILL OTHERWISE IMPACT MAINLY RURAL AREAS OF THE
  INDICATED PARISHES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS FUNNEL CLOUD WILL LIKELY EXTEND TO THE GROUND OVER GRAND ISLE 
AND CONTINUE TO MOVE OFFSHORE AS A WATERSPOUT SOUTH OF THE ISLAND. 
TAKE COVER IMMEDIATELY IF YOU ARE ON GRAND ISLE. 

&&

LAT...LON 2920 9012 2925 9009 2922 9006 2925 8999
      2927 8999 2929 9001 2925 9005 2925 9008
      2926 9008 2931 9003 2929 8999 2935 9000
      2932 8996 2928 8995 2930 8993 2929 8992
      2917 9007
TIME...MOT...LOC 2017Z 299DEG 31KT 2921 8996

$$


24/RR
1 follow-up statement
556 
WWUS54 KLIX 092032
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
332 PM CDT WED MAY 9 2012

LAC051-057-092040-
/O.CAN.KLIX.TO.W.0039.000000T0000Z-120509T2045Z/
LAFOURCHE LA-JEFFERSON LA-
332 PM CDT WED MAY 9 2012

...THE TORNADO WARNING FOR EXTREME SOUTHEASTERN JEFFERSON AND
SOUTHEASTERN LAFOURCHE PARISHES IS CANCELLED...

THE STORMS PRODUCING THE FUNNEL CLOUD HAS MOVED INTO THE COASTAL 
WATERS SOUTH OF GRAND ISLE. A SPECIAL MARINE WARNING REMAINS IN 
EFFECT FOR LIKELY WATERSPOUTS IN THE COASTAL WATERS BELOW GRAND ISLE 
UNTIL 400 PM CDT.

LAT...LON 2920 9012 2925 9009 2922 9006 2925 8999
      2927 8999 2929 9001 2925 9005 2925 9008
      2926 9008 2931 9003 2929 8999 2935 9000
      2932 8996 2928 8995 2930 8993 2929 8992
      2917 9007
TIME...MOT...LOC 2030Z 299DEG 31KT 2915 8985

$$


24/RR

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 11:45 AM CDTSpecial Marine WarningLIX30 min
May 9, 12:02 PM CDTSpecial Marine WarningLIX28 min
May 9, 12:04 PM CDTSpecial Marine WarningLIX56 min
May 9, 12:06 PM CDTSpecial Marine WarningLIX54 min
May 9, 12:23 PM CDTSpecial Marine WarningLIX67 min
May 9, 12:27 PM CDTSpecial Marine WarningLIX33 min
May 9, 12:30 PM CDTSpecial Marine WarningLIX60 min
May 9, 12:49 PM CDTSpecial Marine WarningLIX56 min
May 9, 12:52 PM CDTSpecial Marine WarningLIX53 min
May 9, 12:55 PM CDTSpecial Marine WarningLIX21 min
May 9, 1:38 PM CDTSpecial Marine WarningLIX67 min
May 9, 2:29 PM CDTTornado WarningLIXJefferson, Lafourche31 min
May 9, 2:31 PM CDTSpecial Marine WarningLIX29 min
May 9, 3:09 PM CDTSpecial Marine WarningLIX51 min
May 9, 4:00 PM CDTSpecial Marine WarningLIX30 min
May 9, 5:45 PM CDTSpecial Marine WarningLIX45 min

Nearby

Tornado Warnings in Louisiana, 2012Every tornado warning in 2012Tornadoes in 2012

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.