Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 61, NWS New Orleans, LA

September 14, 2021Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this tornado warning at Sep 14, 2021, 10:38 PM CDT for Terrebonne Parish, Louisiana. It was in force for 37 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
Sep 14, 2021, 10:38 PM CDT (03:38 UTC)
Expired
Sep 14, 2021, 11:15 PM CDT
In force
37 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.0 in

County Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.6 hours before the alert went out and 129 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 2021-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 136 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 2021-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 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
136 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
589 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
181 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

293 
WFUS54 KLIX 150338
TORLIX
LAC109-150415-
/O.NEW.KLIX.TO.W.0061.210915T0338Z-210915T0415Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service New Orleans LA
1038 PM CDT Tue Sep 14 2021

The National Weather Service in New Orleans has issued a

* Tornado Warning for...
  North central Terrebonne Parish in southeastern Louisiana...

* Until 1115 PM CDT.
    
* At 1037 PM CDT, a severe thunderstorm capable of producing a
  tornado was located 10 miles southwest of Bayou Cane, or 11 miles
  west of Houma, moving northeast 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...
  Houma around 1110 PM CDT.
  Bayou Cane, Gray and Schriever around 1115 PM CDT.

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 2949 9097 2972 9090 2972 9088 2973 9088
      2974 9079 2970 9077 2967 9074 2967 9071
      2964 9069 2945 9085
TIME...MOT...LOC 0337Z 203DEG 15KT 2953 9088 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

KLG
2 follow-up statements
544 
WWUS54 KLIX 150403
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1103 PM CDT Tue Sep 14 2021

LAC109-150415-
/O.CON.KLIX.TO.W.0061.000000T0000Z-210915T0415Z/
Terrebonne LA-
1103 PM CDT Tue Sep 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT FOR NORTH
CENTRAL TERREBONNE PARISH...
    
At 1103 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Gray, or 8 miles northwest of Houma, moving
northeast 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...
  Gray around 1125 PM CDT.
  Schriever around 1135 PM CDT.

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 2959 9091 2972 9088 2973 9088 2974 9079
      2970 9077 2967 9074 2957 9083
TIME...MOT...LOC 0403Z 203DEG 15KT 2963 9083 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

KLG
408 
WWUS54 KLIX 150407
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1107 PM CDT Tue Sep 14 2021

LAC109-150416-
/O.EXP.KLIX.TO.W.0061.000000T0000Z-210915T0415Z/
Terrebonne LA-
1107 PM CDT Tue Sep 14 2021

...THE TORNADO WARNING FOR NORTH CENTRAL TERREBONNE PARISH WILL
EXPIRE AT 1115 PM CDT...
                
The storm which prompted the warning has weakened below severe 
limits, and no longer appears capable of producing a 
waterspout or a tornado.

Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this storm.

LAT...LON 2959 9091 2972 9088 2973 9088 2974 9079
      2970 9077 2967 9074 2957 9083
TIME...MOT...LOC 0406Z 203DEG 15KT 2964 9082 

$$

KLG

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 14, 10:20 PM CDTSpecial Weather StatementLIXTerrebonne55 min
Sep 15, 2:33 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles117 min
Sep 15, 3:12 AM CDTAreal Flood AdvisoryLIXTangipahoa2 hr
Sep 15, 3:29 AM CDTTornado WarningLIXPlaquemines, Saint Bernard31 min
Sep 15, 4:09 AM CDTTornado WarningLIXOrleans, Saint Bernard13 min
Sep 15, 4:32 AM CDTSpecial Marine WarningLIX58 min
Sep 15, 5:21 AM CDTFlash Flood WarningLIXSaint Tammany, Tangipahoa, Washington3 hr
Sep 15, 6:22 AM CDTTornado WarningLIXSaint Tammany23 min
Sep 15, 7:14 AM CDTSpecial Marine WarningLIX91 min
Sep 15, 7:45 AM CDTFlash Flood WarningLIXWashington3 hr
Sep 15, 7:55 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Sep 15, 7:55 AM CDTRiver Flood WarningLIXSaint Tammany49 hr
Sep 15, 8:18 AM CDTFlash Flood WarningLIXOrleans, Saint Tammany, Washington5 hr
Sep 15, 8:28 AM CDTSpecial Marine WarningLIX62 min
Sep 15, 8:37 AM CDTRiver Flood WarningLIXTangipahoa28 hr
Sep 15, 8:50 AM CDTSpecial Marine WarningLIX55 min
Sep 15, 8:59 AM CDTRiver Flood WarningLIXEast Baton Rouge28 hr
Sep 15, 9:02 AM CDTRiver Flood WarningLIXSaint Tammany6 days
Sep 15, 9:04 AM CDTRiver Flood WarningLIXSaint Helena4 days
Sep 15, 9:08 AM CDTRiver Flood WarningLIXSaint Tammany, Washington5 days
Sep 15, 9:08 AM CDTRiver Flood WarningLIXSaint Tammany7 days
Sep 15, 9:59 AM CDTSpecial Marine WarningLIX61 min
Sep 15, 3:39 PM CDTRiver Flood WarningLIXLivingston42 hr
Sep 15, 3:39 PM CDTRiver Flood WarningLIXWashington21 hr
Sep 15, 6:13 PM CDTAreal Flood AdvisoryLIXAscension, East Baton Rouge, Iberville, Livingston, West Baton Rouge3 hr

Nearby

Tornado Warnings in Louisiana, 2021Every tornado warning in 2021Tornadoes in 2021

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.