Alert archive / Louisiana / Tornado Warnings in 2015

Tornado Warning 52, NWS New Orleans, LA

November 18, 2015Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Nov 18, 2015, 2:13 AM CST for Orleans Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana. It was in force for 62 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
Nov 18, 2015, 2:13 AM CST (08:13 UTC)
Expired
Nov 18, 2015, 3:15 AM CST
In force
62 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

Counties Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA

The watch it was issued in

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

IssuedProductOfficeLasted
Nov 17, 7:45 PM CSTTornado WatchSPC7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.2 hours before the alert went out and 31 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 2015-11-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 684 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 2015-11-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 388 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
684 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
535 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
388 m²/s²
0-3 km storm-relative helicity
479 m²/s²
Significant tornado parameter
1.7
Supercell composite
7.0

Open this sounding in Storm Lab

The text

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

421 
WFUS54 KLIX 180813
TORLIX
LAC071-075-087-180915-
/O.NEW.KLIX.TO.W.0052.151118T0813Z-151118T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
213 AM CST WED NOV 18 2015

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN ORLEANS PARISH IN SOUTHEASTERN LOUISIANA...
  WEST CENTRAL ST. BERNARD PARISH IN SOUTHEASTERN LOUISIANA...
  NORTHWESTERN PLAQUEMINES PARISH IN SOUTHEASTERN LOUISIANA...

* UNTIL 315 AM CST
    
* AT 211 AM CST...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR POYDRAS...OR 10 MILES SOUTHEAST OF BELLE
  CHASSE...MOVING NORTH AT 35 MPH.

  HAZARD...TORNADO. 

  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...
  POYDRAS AROUND 225 AM CST.
  VIOLET AND MERAUX AROUND 230 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.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 2970 8995 3011 8991 3015 8987 3015 8985
      3011 8985 3010 8982 3015 8975 3015 8971
      3005 8973 3002 8972 3004 8982 3000 8986
      2996 8984 2993 8982 2996 8972 2993 8975
      2990 8973 2969 8974
TIME...MOT...LOC 0811Z 184DEG 30KT 2978 8984 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

AA
2 follow-up statements
388 
WWUS54 KLIX 180848
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
248 AM CST WED NOV 18 2015

LAC071-075-087-180915-
/O.CON.KLIX.TO.W.0052.000000T0000Z-151118T0915Z/
ORLEANS LA-ST. BERNARD LA-PLAQUEMINES LA-
248 AM CST WED NOV 18 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 AM CST FOR EASTERN
ORLEANS...WEST CENTRAL ST. BERNARD AND NORTHWESTERN PLAQUEMINES
PARISHES...
    
AT 247 AM CST...A STORM CAPABLE OF PRODUCING A TORNADO WAS LOCATED
NEAR POYDRAS...OR 9 MILES SOUTHEAST OF BELLE CHASSE... MOVING NORTH
AT 30 MPH.

HAZARD...TORNADO. 

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...
  POYDRAS AROUND 300 AM CST.
  VIOLET AND MERAUX AROUND 310 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.

TORNADOES ARE EXTREMELY DIFFICULT TO SEE AND CONFIRM AT NIGHT. DO NOT
WAIT TO SEE OR HEAR THE TORNADO. TAKE COVER NOW.

&&

LAT...LON 3011 8991 3015 8987 3015 8985 3011 8985
      3010 8982 3015 8975 3015 8971 3005 8973
      3002 8972 3004 8982 3000 8986 2996 8984
      2993 8982 2996 8972 2993 8975 2990 8973
      2975 8974 2975 8995
TIME...MOT...LOC 0847Z 187DEG 24KT 2977 8986 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

AA
705 
WWUS54 KLIX 180916
SVSLIX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
316 AM CST WED NOV 18 2015

LAC071-075-087-180925-
/O.EXP.KLIX.TO.W.0052.000000T0000Z-151118T0915Z/
ORLEANS LA-ST. BERNARD LA-PLAQUEMINES LA-
316 AM CST WED NOV 18 2015

...THE TORNADO WARNING FOR EASTERN ORLEANS...WEST CENTRAL ST. BERNARD
AND NORTHWESTERN PLAQUEMINES PARISHES HAS EXPIRED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA.
THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 AM CST FOR SOUTHEASTERN
LOUISIANA.

LAT...LON 3011 8991 3015 8987 3015 8985 3011 8985
      3010 8982 3015 8975 3015 8971 3005 8973
      3002 8972 3004 8982 3000 8986 2996 8984
      2993 8982 2996 8972 2993 8975 2990 8973
      2975 8974 2975 8995
TIME...MOT...LOC 0914Z 184DEG 30KT 2977 8986 

$$

AA

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 17, 6:02 PM CSTCoastal Flood AdvisoryLIXSaint Bernard, Saint John the Baptist15 hr
Nov 17, 8:44 PM CSTSpecial Weather StatementLIXPointe Coupee31 min
Nov 17, 11:13 PM CSTTornado WarningLIXSaint Helena, Tangipahoa31 min
Nov 17, 11:24 PM CSTSpecial Weather StatementLIXLivingston51 min
Nov 18, 1:34 AM CSTTornado WarningLIXWashington26 min
Nov 18, 2:11 AM CSTSpecial Marine WarningLIX34 min
Nov 18, 2:24 AM CSTSpecial Marine WarningLIX36 min
Nov 18, 2:43 AM CSTSpecial Marine WarningLIX32 min
Nov 18, 3:14 AM CSTSpecial Marine WarningLIX2 hr
Nov 18, 4:05 AM CSTSpecial Marine WarningLIX25 min
Nov 18, 5:02 AM CSTSpecial Marine WarningLIX118 min
Nov 18, 7:04 AM CSTSpecial Marine WarningLIX86 min
Nov 18, 9:58 AM CSTRiver Flood WarningLIXSaint Tammany, Washington9 days
Nov 18, 9:58 AM CSTRiver Flood WarningLIXSaint Tammany9 days
Nov 18, 10:14 AM CSTRiver Flood WarningLIXEast Baton Rouge44 hr
Nov 18, 10:14 AM CSTRiver Flood WarningLIXEast Baton Rouge, Livingston65 hr
Nov 18, 10:20 AM CSTRiver Flood WarningLIXTangipahoa4 days

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.