Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS New Orleans, LA

April 24, 20215 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 24, 2021, 3:30 AM CDT for 5 parishes in Louisiana. It was in force for 30 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 24, 2021, 3:30 AM CDT (08:30 UTC)
Expired
Apr 24, 2021, 4:00 AM CDT
In force
30 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Ascension Parish, LA, Livingston Parish, LA, Saint James Parish, LA, Saint John the Baptist 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.

IssuedProductOfficeLasted
Apr 23, 8:30 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.5 hours before the alert went out and 90 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 2021-04-24Temperature 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 2021-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 156 square meters per square second.1939587897117Sfc1 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
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.

472 
WUUS54 KLIX 240830
SVRLIX
LAC005-063-093-095-105-240900-
/O.NEW.KLIX.SV.W.0082.210424T0830Z-210424T0900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
330 AM CDT Sat Apr 24 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northern St. John The Baptist Parish in southeastern Louisiana...
  Central Ascension Parish in southeastern Louisiana...
  Northeastern St. James Parish in southeastern Louisiana...
  Livingston Parish in southeastern Louisiana...
  Southern Tangipahoa Parish in southeastern Louisiana...

* Until 400 AM CDT.

* At 329 AM CDT, strong winds in the wake of a line of thunderstorms 
  were located from near Walker to near French Settlement to near 
  Sorrento, moving east at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hammond, Denham Springs, Ponchatoula, Walker, Livingston, Sorrento,
  French Settlement, Albany, Port Vincent, Springfield, Natalbany,
  Robert, Whitehall, Killian and Tickfaw.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 182 and 193.
 Interstate 12 between mile markers 12 and 48.
 Interstate 55 in Louisiana between mile markers 2 and 37.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

These storms are producing destructive winds and large damaging hail.
SEEK SHELTER NOW inside a sturdy structure and stay away from
windows!
 
To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in New Orleans.

&&

LAT...LON 3054 9097 3060 9041 3038 9024 3036 9024
      3026 9033 3022 9040 3019 9043 3011 9043
      3014 9092 3033 9085 3049 9097 3054 9098
TIME...MOT...LOC 0829Z 265DEG 53KT 3052 9092 3034 9078 3011 9087 

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

PG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 23, 9:28 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington47 min
Apr 23, 10:12 PM CDTSpecial Weather StatementLIXEast Baton Rouge, West Baton Rouge33 min
Apr 23, 10:34 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston, West Baton Rouge26 min
Apr 23, 10:47 PM CDTTornado WarningLIXEast Baton Rouge, Livingston, West Baton Rouge28 min
Apr 23, 11:14 PM CDTSevere Thunderstorm WarningLIXLivingston, Saint Helena, Tangipahoa31 min
Apr 23, 11:46 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington44 min
Apr 24, 12:28 AM CDTSevere Thunderstorm WarningLIXWashington47 min
Apr 24, 12:56 AM CDTSpecial Weather StatementLIXEast Baton Rouge, East Feliciana, Pointe Coupee, West Baton Rouge, West Feliciana64 min
Apr 24, 1:36 AM CDTSpecial Weather StatementLIXLivingston24 min
Apr 24, 1:43 AM CDTSpecial Weather StatementLIXWashington32 min
Apr 24, 1:50 AM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, Iberville, Livingston, Saint Helena, Tangipahoa25 min
Apr 24, 2:17 AM CDTSpecial Weather StatementLIXAscension, Livingston, Tangipahoa, Washington43 min
Apr 24, 3:00 AM CDTSpecial Weather StatementLIXAssumption, Saint James, Saint John the Baptist, Saint Tammany60 min
Apr 24, 3:02 AM CDTSpecial Marine WarningLIX58 min
Apr 24, 3:21 AM CDTSpecial Weather StatementLIXAscension, East Baton Rouge, Livingston, Saint John the Baptist, Tangipahoa39 min
Apr 24, 3:55 AM CDTSpecial Marine WarningLIX65 min
Apr 24, 3:59 AM CDTSpecial Weather StatementLIXOrleans, Saint Charles61 min
Apr 24, 4:06 AM CDTSevere Thunderstorm WarningLIXSaint Tammany24 min
Apr 24, 5:36 AM CDTSpecial Weather StatementLIXSaint Tammany39 min
Apr 24, 9:44 AM CDTRiver Flood WarningLIXTangipahoa3 days
Apr 24, 9:46 AM CDTRiver Flood WarningLIXSaint Tammany48 hr
Apr 24, 11:12 AM CDTRiver Flood WarningLIXSaint Tammany21 days
Apr 24, 11:12 AM CDTRiver Flood WarningLIXWashington72 hr

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.