Alert archive / Louisiana / Tornado Warnings in 2018

Tornado Warning 5, NWS New Orleans, LA

April 7, 2018Jefferson Parish, Saint Charles Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Apr 7, 2018, 5:46 AM CDT for Jefferson Parish, Saint Charles Parish, Louisiana. It was in force for 29 min. 2 reports 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: Apr 7, 2018, 5:46 AM CDT (10:46 UTC)
Expired: Apr 7, 2018, 6:15 AM CDT
In force: 29 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Jefferson Parish, LA, Saint Charles Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 7, 5:50 AM CDT	TSTM WND DMG	2 Sw Boutte, LA	EM REPORTED DAMAGE IN PARADIS. TREE AND POWER POLE DAMAGE. CARPORT TORN OFF OF HOME. POSSIBLE TORNADO. TIME ESTIMATED BASED ON RADAR.
Apr 7, 5:50 AM CDT	TSTM WND DMG	3 Wsw Boutte, LA	STORM SURVEY INDICATED MINOR WIND DAMAGE ALONG FONDA STREET BETWEEN AUDUBON STREET AND ROBERT STREET IN PARADIS. ESTIMATED WINDS 60 TO 65 MPH.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 6, 8:53 PM CDT	Severe Thunderstorm Watch	SPC	10 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 10.8 hours before the alert went out and 78 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: 933 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 780 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 144 m²/s²
0-3 km storm-relative helicity: 257 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted.

827 
WFUS54 KLIX 071046
TORLIX
LAC051-089-071115-
/O.NEW.KLIX.TO.W.0005.180407T1046Z-180407T1115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
546 AM CDT SAT APR 7 2018

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  Central St. Charles Parish in southeastern Louisiana...
  Northwestern Jefferson Parish in southeastern Louisiana...

* Until 615 AM CDT
    
* At 546 AM CDT, a severe thunderstorm capable of producing a tornado
  was located near Paradis, or near Hahnville, moving east at 45 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...
  Bayou Gauche and Des Allemands around 550 AM CDT. 
  Boutte, Luling and Destrehan around 555 AM CDT. 
  Ama and St. Rose around 600 AM CDT. 
  Waggaman around 605 AM CDT. 
  Avondale around 610 AM 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 2987 9051 2998 9051 2994 9018 2973 9022
TIME...MOT...LOC 1046Z 282DEG 38KT 2990 9048 

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

$$

2 follow-up statements

857 
WWUS54 KLIX 071057
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
557 AM CDT SAT APR 7 2018

LAC051-089-071115-
/O.CON.KLIX.TO.W.0005.000000T0000Z-180407T1115Z/
St. Charles LA-Jefferson LA-
557 AM CDT SAT APR 7 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 AM CDT FOR CENTRAL
ST. CHARLES AND NORTHWESTERN JEFFERSON PARISHES...
    
At 556 AM CDT, a severe thunderstorm capable of producing a tornado
was located over Luling, or 8 miles southeast of Hahnville, moving
east at 45 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...
  Avondale around 610 AM 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 2987 9051 2998 9051 2994 9018 2973 9022
TIME...MOT...LOC 1056Z 284DEG 38KT 2987 9035 

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

$$

468 
WWUS54 KLIX 071112
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
612 AM CDT SAT APR 7 2018

LAC051-089-071122-
/O.EXP.KLIX.TO.W.0005.000000T0000Z-180407T1115Z/
St. Charles LA-Jefferson LA-
612 AM CDT SAT APR 7 2018

...THE TORNADO WARNING FOR CENTRAL ST. CHARLES AND NORTHWESTERN
JEFFERSON PARISHES WILL EXPIRE AT 615 AM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 700 AM CDT for
southeastern Louisiana.

LAT...LON 2987 9051 2998 9051 2994 9018 2973 9022
TIME...MOT...LOC 1112Z 292DEG 29KT 2983 9020 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 12:29 AM CDT	Special Weather Statement	LIX	East Feliciana, Saint Helena, West Feliciana	46 min
Apr 7, 1:27 AM CDT	Tornado Warning	LIX	Washington	18 min
Apr 7, 1:52 AM CDT	Special Weather Statement	LIX	Washington	38 min
Apr 7, 2:38 AM CDT	Special Weather Statement	LIX	West Baton Rouge	67 min
Apr 7, 3:28 AM CDT	Special Weather Statement	LIX	East Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana	62 min
Apr 7, 3:47 AM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, West Baton Rouge	28 min
Apr 7, 4:34 AM CDT	Special Weather Statement	LIX	East Baton Rouge, Livingston	56 min
Apr 7, 4:54 AM CDT	Special Weather Statement	LIX	Ascension	51 min
Apr 7, 5:22 AM CDT	Special Weather Statement	LIX	Saint Charles, Saint James	23 min
Apr 7, 6:04 AM CDT	Special Marine Warning	LIX		41 min
Apr 7, 6:05 AM CDT	Special Weather Statement	LIX	Orleans	25 min
Apr 7, 6:39 AM CDT	Special Weather Statement	LIX	Jefferson, Plaquemines	66 min
Apr 7, 6:46 AM CDT	Special Marine Warning	LIX		59 min
Apr 7, 7:11 AM CDT	Special Weather Statement	LIX	Plaquemines	64 min
Apr 7, 7:13 AM CDT	Special Marine Warning	LIX		62 min
Apr 7, 7:47 AM CDT	Special Marine Warning	LIX		88 min
Apr 7, 8:00 AM CDT	Special Marine Warning	LIX		60 min
Apr 7, 8:43 AM CDT	River Flood Warning	LIX	Saint Tammany, Washington	28 days
Apr 7, 8:43 AM CDT	River Flood Warning	LIX	Saint Tammany	29 days
Apr 7, 8:47 AM CDT	Special Marine Warning	LIX		58 min

Nearby

Tornado Warnings in Louisiana, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.