Alert archive / Louisiana / Tornado Warnings in 2015

Tornado Warning 55, NWS New Orleans, LA

December 23, 2015Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Dec 23, 2015, 3:20 AM CST for Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 25 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, 3:20 AM CST (09:20 UTC)
Expired: Dec 23, 2015, 3:45 AM CST
In force: 25 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Plaquemines Parish, LA, Saint Bernard Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 9.3 hours before the alert went out and 68 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: 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.

694 
WFUS54 KLIX 230920
TORLIX
LAC075-087-230945-
/O.NEW.KLIX.TO.W.0055.151223T0920Z-151223T0945Z/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL ST. BERNARD PARISH IN SOUTHEASTERN LOUISIANA...
  NORTHWESTERN PLAQUEMINES PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 345 AM CST
    
* AT 319 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR PORT SULPHUR...MOVING NORTHEAST AT 35 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 DANGEROUS STORM WILL BE NEAR...
  PORT SULPHUR AROUND 325 AM CST.
  EMPIRE AROUND 330 AM CST.

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 2949 8986 2979 8956 2974 8951 2976 8958
      2972 8957 2972 8956 2969 8960 2973 8951
      2970 8955 2972 8950 2966 8953 2968 8947
      2967 8948 2966 8945 2965 8945 2961 8973
      2947 8959 2939 8976
TIME...MOT...LOC 0919Z 231DEG 29KT 2948 8977 

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

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 22, 7:05 PM CST	Special Marine Warning	LIX		40 min
Dec 22, 7:42 PM CST	Special Marine Warning	LIX		18 min
Dec 22, 8:17 PM CST	Special Weather Statement	LIX	Terrebonne	43 min
Dec 22, 8:31 PM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	29 min
Dec 22, 9:03 PM CST	Special Weather Statement	LIX	Jefferson	42 min
Dec 22, 9:37 PM CST	Special Weather Statement	LIX	Lafourche	38 min
Dec 22, 10:55 PM CST	Special Marine Warning	LIX		65 min
Dec 22, 10:58 PM CST	Special Weather Statement	LIX	Lafourche	47 min
Dec 22, 11:57 PM CST	Special Marine Warning	LIX		93 min
Dec 23, 12:08 AM CST	Special Weather Statement	LIX	Ascension, Livingston, Saint James	52 min
Dec 23, 1:30 AM CST	Special Weather Statement	LIX	Jefferson	60 min
Dec 23, 1:35 AM CST	Special Marine Warning	LIX		55 min
Dec 23, 1:50 AM CST	Severe Thunderstorm Warning	LIX	Jefferson, Lafourche, Plaquemines	55 min
Dec 23, 2:02 AM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	43 min
Dec 23, 2:24 AM CST	Tornado Warning	LIX	Jefferson, Lafourche	51 min
Dec 23, 2:27 AM CST	Special Marine Warning	LIX		63 min
Dec 23, 3:01 AM CST	Special Marine Warning	LIX		29 min
Dec 23, 3:30 AM CST	Small Craft Advisory	LIX		18 hr
Dec 23, 3:38 AM CST	Special Marine Warning	LIX		97 min
Dec 23, 5:10 AM CST	Special Marine Warning	LIX		95 min

Nearby

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