Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 75, NWS New Orleans, LA

May 30, 2017Jefferson Parish, Lafourche Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at May 30, 2017, 2:23 PM CDT for Jefferson Parish, Lafourche Parish, Louisiana. It was in force for 17 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 30, 2017, 2:23 PM CDT (19:23 UTC)
Expired
May 30, 2017, 2:40 PM CDT
In force
17 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Jefferson Parish, LA, Lafourche Parish, LA

What was reported inside it

TimeReportWhereRemark
May 30, 2:36 PM CDTTORNADO5 E Galliano, LAIMAGE SHARED THROUGH SOCIAL MEDIA OF A TORNADO EAST OF GALLIANO

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.4 hours before the alert went out and 98 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 2017-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 296 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 2017-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 184 square meters per square second.193958Sfc1 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
296 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
184 m²/s²
0-3 km storm-relative helicity
334 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

931 
WFUS54 KLIX 301923
TORLIX
LAC051-057-302000-
/O.NEW.KLIX.TO.W.0075.170530T1923Z-170530T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
223 PM CDT TUE MAY 30 2017

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  East central Lafourche Parish in southeastern Louisiana...
  Central Jefferson Parish in southeastern Louisiana...

* Until 300 PM CDT
    
* At 223 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Galliano, moving north at 15 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...
  Cut Off around 255 PM CDT. 
  Larose around 300 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to 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 2939 9012 2937 9033 2964 9040 2966 9009
TIME...MOT...LOC 1923Z 175DEG 12KT 2946 9023 

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

$$
1 follow-up statement
064 
WWUS54 KLIX 301940
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
240 PM CDT TUE MAY 30 2017

LAC051-057-301950-
/O.CAN.KLIX.TO.W.0075.000000T0000Z-170530T2000Z/
Lafourche LA-Jefferson LA-
240 PM CDT TUE MAY 30 2017

...THE TORNADO WARNING FOR EAST CENTRAL LAFOURCHE AND CENTRAL
JEFFERSON PARISHES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning has been cancelled.  However, heavy rain is 
still possible with this thunderstorm.

LAT...LON 2939 9012 2937 9033 2964 9040 2966 9009
TIME...MOT...LOC 1939Z 175DEG 12KT 2952 9024 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 29, 7:38 PM CDTSpecial Weather StatementLIXJefferson67 min
May 30, 3:04 AM CDTSpecial Weather StatementLIXJefferson41 min
May 30, 3:39 AM CDTSpecial Marine WarningLIX51 min
May 30, 4:55 AM CDTSpecial Weather StatementLIXPlaquemines35 min
May 30, 8:12 AM CDTSpecial Weather StatementLIXAscension, Livingston33 min
May 30, 8:39 AM CDTSpecial Marine WarningLIX66 min
May 30, 9:28 AM CDTSpecial Weather StatementLIXSaint John the Baptist62 min
May 30, 9:33 AM CDTSpecial Marine WarningLIX57 min
May 30, 10:20 AM CDTSpecial Weather StatementLIXTerrebonne25 min
May 30, 11:52 AM CDTSpecial Weather StatementLIXTerrebonne53 min
May 30, 12:51 PM CDTSpecial Weather StatementLIXLafourche54 min
May 30, 12:53 PM CDTTornado WarningLIXLafourche, Terrebonne24 min
May 30, 1:02 PM CDTAreal Flood AdvisoryLIXAssumption, Lafourche, Saint Charles, Terrebonne3 hr
May 30, 1:28 PM CDTSpecial Weather StatementLIXLafourche32 min
May 30, 1:36 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche24 min
May 30, 2:16 PM CDTSpecial Weather StatementLIXJefferson29 min
May 30, 2:18 PM CDTSpecial Marine WarningLIX27 min
May 30, 3:05 PM CDTSpecial Marine WarningLIX85 min
May 30, 3:15 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche30 min
May 30, 3:19 PM CDTSpecial Marine WarningLIX26 min
May 30, 3:26 PM CDTTornado WarningLIXJefferson, Lafourche34 min
May 30, 4:01 PM CDTTornado WarningLIXPlaquemines44 min
May 30, 4:03 PM CDTTornado WarningLIXLafourche27 min
May 30, 4:09 PM CDTSpecial Marine WarningLIX51 min
May 30, 4:27 PM CDTTornado WarningLIXLafourche48 min
May 30, 4:42 PM CDTSevere Thunderstorm WarningLIXPlaquemines63 min
May 30, 4:50 PM CDTSpecial Marine WarningLIX85 min
May 30, 5:26 PM CDTSpecial Marine WarningLIX94 min
May 30, 5:39 PM CDTSpecial Marine WarningLIX36 min
May 30, 5:40 PM CDTTornado WarningLIXJefferson23 min
May 30, 6:01 PM CDTSpecial Weather StatementLIXPlaquemines59 min

Nearby

Tornado Warnings in Louisiana, 2017Every tornado warning in 2017Tornadoes in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.