Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 86, NWS New Orleans, LA

May 2, 2021Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 2, 2021, 6:56 AM CDT for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 49 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
May 2, 2021, 6:56 AM CDT (11:56 UTC)
Expired
May 2, 2021, 7:45 AM CDT
In force
49 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Livingston Parish, LA, Saint Helena Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 11.9 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 00:00Z on 2021-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1611 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
-3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

779 
WUUS54 KLIX 021156
SVRLIX
LAC063-091-105-021245-
/O.NEW.KLIX.SV.W.0086.210502T1156Z-210502T1245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
656 AM CDT Sun May 2 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Eastern St. Helena Parish in southeastern Louisiana...
  Northeastern Livingston Parish in southeastern Louisiana...
  Northwestern Tangipahoa Parish in southeastern Louisiana...

* Until 745 AM CDT.

* At 656 AM CDT, a severe thunderstorm was located over Montpelier,
  or 10 miles southwest of Amite, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Greensburg, Amite, Amite City, Kentwood, Independence, Roseland,
  Osyka, Montpelier and Tangipahoa.

This includes Interstate 55 in Louisiana between mile markers 40 and
66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3050 9060 3060 9072 3100 9066 3100 9035
      3089 9035
TIME...MOT...LOC 1156Z 205DEG 41KT 3067 9066 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CAB
3 follow-up statements
813 
WWUS54 KLIX 021204
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
704 AM CDT Sun May 2 2021

LAC063-091-105-021245-
/O.CON.KLIX.SV.W.0086.000000T0000Z-210502T1245Z/
St. Helena LA-Livingston LA-Tangipahoa LA-
704 AM CDT Sun May 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR EASTERN ST. HELENA...NORTHERN LIVINGSTON AND NORTHWESTERN
TANGIPAHOA PARISHES...

At 704 AM CDT, a severe thunderstorm was located near Montpelier, or
near Amite, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Amite, Amite City, Kentwood, Independence, Roseland, Osyka,
Montpelier and Tangipahoa.

This includes Interstate 55 in Louisiana between mile markers 40 and
66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3059 9054 3066 9066 3100 9064 3100 9035
      3089 9035
TIME...MOT...LOC 1204Z 209DEG 38KT 3068 9058 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CAB
087 
WWUS54 KLIX 021208
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
708 AM CDT Sun May 2 2021

LAC063-021218-
/O.CAN.KLIX.SV.W.0086.000000T0000Z-210502T1245Z/
Livingston LA-
708 AM CDT Sun May 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN LIVINGSTON PARISH IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3100 9035 3089 9035 3062 9052 3067 9062
      3100 9064
TIME...MOT...LOC 1208Z 221DEG 29KT 3067 9055 

$$

LAC091-105-021245-
/O.CON.KLIX.SV.W.0086.000000T0000Z-210502T1245Z/
St. Helena LA-Tangipahoa LA-
708 AM CDT Sun May 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR EASTERN ST. HELENA AND NORTHWESTERN TANGIPAHOA PARISHES...

At 708 AM CDT, a severe thunderstorm was located near Independence,
or near Amite, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Amite, Amite City, Kentwood, Independence, Roseland, Osyka and
Tangipahoa.

This includes Interstate 55 in Louisiana between mile markers 40 and
66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3100 9035 3089 9035 3062 9052 3067 9062
      3100 9064
TIME...MOT...LOC 1208Z 221DEG 29KT 3067 9055 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CAB
965 
WWUS54 KLIX 021220
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
720 AM CDT Sun May 2 2021

LAC091-021229-
/O.CAN.KLIX.SV.W.0086.000000T0000Z-210502T1245Z/
St. Helena LA-
720 AM CDT Sun May 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN ST. HELENA PARISH IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3100 9035 3089 9035 3070 9048 3073 9056
      3100 9056
TIME...MOT...LOC 1219Z 217DEG 30KT 3076 9048 

$$

LAC105-021245-
/O.CON.KLIX.SV.W.0086.000000T0000Z-210502T1245Z/
Tangipahoa LA-
720 AM CDT Sun May 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 AM CDT
FOR NORTHWESTERN TANGIPAHOA PARISH...

At 719 AM CDT, a severe thunderstorm was located over Roseland, or
over Amite, moving northeast at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Amite, Amite City, Kentwood, Roseland, Osyka and Tangipahoa. 

This includes Interstate 55 in Louisiana between mile markers 47 and
66.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3100 9035 3089 9035 3070 9048 3073 9056
      3100 9056
TIME...MOT...LOC 1219Z 217DEG 30KT 3076 9048 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CAB

The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 3:34 AM CDTSmall Craft AdvisoryLIX39 hr
May 2, 5:04 AM CDTAreal Flood AdvisoryLIXEast Baton Rouge, Iberville, West Baton Rouge3 hr
May 2, 5:39 AM CDTSpecial Weather StatementLIXAssumption51 min
May 2, 5:43 AM CDTSpecial Weather StatementLIXSaint James47 min
May 2, 6:33 AM CDTSpecial Weather StatementLIXLivingston, Saint John the Baptist, Tangipahoa72 min
May 2, 6:58 AM CDTSpecial Marine WarningLIX47 min
May 2, 7:40 AM CDTSpecial Marine WarningLIX65 min
May 2, 7:45 AM CDTSpecial Weather StatementLIXSaint Tammany60 min
May 2, 8:07 AM CDTSpecial Weather StatementLIXSaint Tammany23 min
May 2, 8:32 AM CDTSpecial Weather StatementLIXSaint Tammany43 min
May 2, 8:37 AM CDTSpecial Marine WarningLIX38 min
May 2, 8:43 AM CDTSevere Thunderstorm WarningLIXSaint Tammany47 min
May 2, 9:03 AM CDTSpecial Marine WarningLIX57 min
May 2, 9:17 AM CDTSpecial Weather StatementLIXLafourche28 min
May 2, 9:33 AM CDTSpecial Weather StatementLIXJefferson42 min
May 2, 9:44 AM CDTSpecial Weather StatementLIXLafourche, Saint Charles, Saint James, Saint John the Baptist31 min
May 2, 10:05 AM CDTSpecial Marine WarningLIX55 min
May 2, 10:18 AM CDTSpecial Weather StatementLIXOrleans57 min
May 2, 10:20 AM CDTSpecial Weather StatementLIXJefferson55 min
May 2, 10:51 AM CDTSpecial Marine WarningLIX54 min
May 2, 11:03 AM CDTSpecial Marine WarningLIX57 min
May 2, 11:21 AM CDTSpecial Weather StatementLIXPlaquemines54 min
May 2, 11:56 AM CDTSpecial Marine WarningLIX64 min
May 2, 1:24 PM CDTSpecial Marine WarningLIX66 min
May 2, 4:32 PM CDTSpecial Marine WarningLIX44 min
May 2, 5:31 PM CDTSpecial Marine WarningLIX89 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021Every severe thunderstorm warning 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.