Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 77, NWS New Orleans, LA

April 23, 2021Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 23, 2021, 11:14 PM CDT for Livingston Parish, Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 31 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: Apr 23, 2021, 11:14 PM CDT (04:14 UTC)
Expired: Apr 23, 2021, 11:45 PM CDT
In force: 31 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 23, 8:30 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.2 hours before the alert went out and 100 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 263 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

483 
WUUS54 KLIX 240414
SVRLIX
LAC063-091-105-240445-
/O.NEW.KLIX.SV.W.0077.210424T0414Z-210424T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1114 PM CDT Fri Apr 23 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Southeastern St. Helena Parish in southeastern Louisiana...
  Northern Livingston Parish in southeastern Louisiana...
  West central Tangipahoa Parish in southeastern Louisiana...

* Until 1145 PM CDT.

* At 1114 PM CDT, a severe thunderstorm was located near Livingston,
  or 10 miles northeast of Denham Springs, moving northeast at 50
  mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hammond, Amite, Walker, Amite City, Livingston, Independence,
  Roseland, Albany, Montpelier, Natalbany and Tickfaw.

This includes the following Interstates...
 Interstate 12 between mile markers 15 and 38.
 Interstate 55 in Louisiana between mile markers 30 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 AM CDT for southeastern
Louisiana.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 3042 9086 3059 9094 3084 9038 3050 9036
TIME...MOT...LOC 0414Z 247DEG 44KT 3054 9081 

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

1 follow-up statement

150 
WWUS54 KLIX 240436
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1136 PM CDT Fri Apr 23 2021

LAC063-240446-
/O.CAN.KLIX.SV.W.0077.000000T0000Z-210424T0445Z/
Livingston LA-
1136 PM CDT Fri Apr 23 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.

A Tornado Watch remains in effect until 400 AM CDT for southeastern
Louisiana.

LAT...LON 3050 9036 3047 9055 3049 9057 3065 9057
      3065 9080 3084 9038
TIME...MOT...LOC 0436Z 247DEG 44KT 3065 9052 

$$

LAC091-105-240445-
/O.CON.KLIX.SV.W.0077.000000T0000Z-210424T0445Z/
St. Helena LA-Tangipahoa LA-
1136 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR SOUTHEASTERN ST. HELENA AND WEST CENTRAL TANGIPAHOA PARISHES...

At 1136 PM CDT, a severe thunderstorm was located over Independence,
or near 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...
Hammond, Amite, Amite City, Independence, Roseland, Montpelier,
Natalbany and Tickfaw.

This includes the following Interstates...
 Interstate 12 between mile markers 35 and 37.
 Interstate 55 in Louisiana between mile markers 30 and 50.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 400 AM CDT for southeastern
Louisiana.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into a
small central room in a sturdy structure.

&&

LAT...LON 3050 9036 3047 9055 3049 9057 3065 9057
      3065 9080 3084 9038
TIME...MOT...LOC 0436Z 247DEG 44KT 3065 9052 

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 9:28 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	47 min
Apr 23, 10:12 PM CDT	Special Weather Statement	LIX	East Baton Rouge, West Baton Rouge	33 min
Apr 23, 10:34 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge, Livingston, West Baton Rouge	26 min
Apr 23, 10:47 PM CDT	Tornado Warning	LIX	East Baton Rouge, Livingston, West Baton Rouge	28 min
Apr 23, 11:46 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany, Tangipahoa, Washington	44 min
Apr 24, 12:28 AM CDT	Severe Thunderstorm Warning	LIX	Washington	47 min
Apr 24, 12:56 AM CDT	Special Weather Statement	LIX	East Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana	64 min
Apr 24, 1:36 AM CDT	Special Weather Statement	LIX	Livingston	24 min
Apr 24, 1:43 AM CDT	Special Weather Statement	LIX	Washington	32 min
Apr 24, 1:50 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, East Baton Rouge, Iberville, Livingston, Saint Helena, Tangipahoa	25 min
Apr 24, 2:17 AM CDT	Special Weather Statement	LIX	Ascension, Livingston, Tangipahoa, Washington	43 min
Apr 24, 3:00 AM CDT	Special Weather Statement	LIX	Assumption, Saint James, Saint John the Baptist, Saint Tammany	60 min
Apr 24, 3:02 AM CDT	Special Marine Warning	LIX		58 min
Apr 24, 3:21 AM CDT	Special Weather Statement	LIX	Ascension, East Baton Rouge, Livingston, Saint John the Baptist, Tangipahoa	39 min
Apr 24, 3:30 AM CDT	Severe Thunderstorm Warning	LIX	Ascension, Livingston, Saint James, Saint John the Baptist, Tangipahoa	30 min
Apr 24, 3:55 AM CDT	Special Marine Warning	LIX		65 min
Apr 24, 3:59 AM CDT	Special Weather Statement	LIX	Orleans, Saint Charles	61 min
Apr 24, 4:06 AM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	24 min
Apr 24, 5:36 AM CDT	Special Weather Statement	LIX	Saint Tammany	39 min
Apr 24, 9:44 AM CDT	River Flood Warning	LIX	Tangipahoa	3 days
Apr 24, 9:46 AM CDT	River Flood Warning	LIX	Saint Tammany	48 hr
Apr 24, 11:12 AM CDT	River Flood Warning	LIX	Saint Tammany	21 days
Apr 24, 11:12 AM CDT	River Flood Warning	LIX	Washington	72 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every 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.