Alert archive / Louisiana / Tornado Warnings in 2015

Tornado Warning 53, NWS New Orleans, LA

December 23, 2015Jefferson Parish, Lafourche Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Dec 23, 2015, 2:24 AM CST for Jefferson Parish, Lafourche Parish, Louisiana. It was in force for 51 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
Dec 23, 2015, 2:24 AM CST (08:24 UTC)
Expired
Dec 23, 2015, 3:15 AM CST
In force
51 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
1.25 in

Counties Jefferson Parish, LA, Lafourche Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.4 hours before the alert went out and 108 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 00:00Z on 2015-12-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 84 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 00:00Z on 2015-12-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 211 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
84 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
211 m²/s²
0-3 km storm-relative helicity
193 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.

343 
WFUS54 KLIX 230824
TORLIX
LAC051-057-230915-
/O.NEW.KLIX.TO.W.0053.151223T0824Z-151223T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
224 AM CST WED DEC 23 2015

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN LAFOURCHE PARISH IN SOUTHEASTERN LOUISIANA...
  SOUTHEASTERN JEFFERSON PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 315 AM CST
    
* AT 223 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR LEEVILLE...OR 14 MILES SOUTHEAST OF
  GALLIANO...MOVING NORTHEAST AT 30 MPH.

  HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
  SOUTHEASTERN LAFOURCHE AND SOUTHEASTERN JEFFERSON PARISHES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL
SHELTER AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 2928 9025 2954 8998 2946 8998 2949 9000
      2945 9002 2942 8998 2941 9003 2929 8993
      2936 9007 2927 8995 2929 9001 2925 9005
      2930 9003 2932 9010 2927 9006 2924 9011
      2922 9007 2917 9014
TIME...MOT...LOC 0823Z 230DEG 27KT 2927 9015 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 22, 7:05 PM CSTSpecial Marine WarningLIX40 min
Dec 22, 7:42 PM CSTSpecial Marine WarningLIX18 min
Dec 22, 8:17 PM CSTSpecial Weather StatementLIXTerrebonne43 min
Dec 22, 8:31 PM CSTSevere Thunderstorm WarningLIXLafourche, Terrebonne29 min
Dec 22, 9:03 PM CSTSpecial Weather StatementLIXJefferson42 min
Dec 22, 9:37 PM CSTSpecial Weather StatementLIXLafourche38 min
Dec 22, 10:55 PM CSTSpecial Marine WarningLIX65 min
Dec 22, 10:58 PM CSTSpecial Weather StatementLIXLafourche47 min
Dec 22, 11:57 PM CSTSpecial Marine WarningLIX93 min
Dec 23, 12:08 AM CSTSpecial Weather StatementLIXAscension, Livingston, Saint James52 min
Dec 23, 1:30 AM CSTSpecial Weather StatementLIXJefferson60 min
Dec 23, 1:35 AM CSTSpecial Marine WarningLIX55 min
Dec 23, 1:50 AM CSTSevere Thunderstorm WarningLIXJefferson, Lafourche, Plaquemines55 min
Dec 23, 2:02 AM CSTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana43 min
Dec 23, 2:27 AM CSTSpecial Marine WarningLIX63 min
Dec 23, 3:01 AM CSTSpecial Marine WarningLIX29 min
Dec 23, 3:20 AM CSTTornado WarningLIXPlaquemines, Saint Bernard25 min
Dec 23, 3:30 AM CSTSmall Craft AdvisoryLIX18 hr
Dec 23, 3:38 AM CSTSpecial Marine WarningLIX97 min
Dec 23, 5:10 AM CSTSpecial Marine WarningLIX95 min

Nearby

Tornado Warnings in Louisiana, 2015Every tornado warning in 2015Tornadoes in 2015

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.