Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 93, NWS New Orleans, LA

May 4, 2021Livingston Parish, Saint John the Baptist Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 4, 2021, 10:03 PM CDT for Livingston Parish, Saint John the Baptist Parish, Tangipahoa Parish, Louisiana. It was in force for 27 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 4, 2021, 10:03 PM CDT (03:03 UTC)
Expired
May 4, 2021, 10:30 PM CDT
In force
27 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Livingston Parish, LA, Saint John the Baptist Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.1 hours before the alert went out and 74 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 2021-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3152 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 2021-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 square meters per square second.1939587897Sfc1 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
3152 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
647 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
3.1
Supercell composite
10.5

Open this sounding in Storm Lab

The text

As transmitted.

525 
WUUS54 KLIX 050303
SVRLIX
LAC063-095-105-050345-
/O.NEW.KLIX.SV.W.0093.210505T0303Z-210505T0345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1003 PM CDT Tue May 4 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northeastern St. John The Baptist Parish in southeastern
  Louisiana...
  Southeastern Livingston Parish in southeastern Louisiana...
  South central Tangipahoa Parish in southeastern Louisiana...

* Until 1045 PM CDT.

* At 1003 PM CDT, a severe thunderstorm was located near Whitehall,
  or 13 miles north of Reserve, moving east at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Killian.

This includes Interstate 55 in Louisiana between mile markers 12 and
23.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3042 9031 3030 9030 3024 9036 3024 9043
      3029 9040 3030 9043 3032 9043 3034 9049
      3030 9056 3026 9059 3023 9058 3023 9067
      3038 9068
TIME...MOT...LOC 0303Z 267DEG 23KT 3027 9062 

HAIL...1.00IN
WIND...60MPH
 
$$

23
2 follow-up statements
766 
WWUS54 KLIX 050315
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1015 PM CDT Tue May 4 2021

LAC063-095-105-050345-
/O.CON.KLIX.SV.W.0093.000000T0000Z-210505T0345Z/
St. John The Baptist LA-Livingston LA-Tangipahoa LA-
1015 PM CDT Tue May 4 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT
FOR NORTHEASTERN ST. JOHN THE BAPTIST...SOUTHEASTERN LIVINGSTON AND
SOUTH CENTRAL TANGIPAHOA PARISHES...

At 1014 PM CDT, a severe thunderstorm was located 9 miles east of
Whitehall, or 13 miles north of Reserve, moving east at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Killian.

This includes Interstate 55 in Louisiana between mile markers 12 and
23.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3042 9031 3030 9030 3024 9036 3024 9043
      3029 9040 3030 9043 3032 9043 3034 9049
      3030 9056 3039 9058
TIME...MOT...LOC 0314Z 267DEG 23KT 3027 9053 

HAIL...1.00IN
WIND...60MPH
 
$$

23
307 
WWUS54 KLIX 050330
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1030 PM CDT Tue May 4 2021

LAC063-095-105-050338-
/O.CAN.KLIX.SV.W.0093.000000T0000Z-210505T0345Z/
St. John The Baptist LA-Livingston LA-Tangipahoa LA-
1030 PM CDT Tue May 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. JOHN THE
BAPTIST...SOUTHEASTERN LIVINGSTON AND SOUTH CENTRAL TANGIPAHOA
PARISHES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3042 9031 3030 9030 3024 9036 3024 9043
      3029 9040 3030 9043 3032 9043 3034 9049
      3030 9056 3039 9058
TIME...MOT...LOC 0328Z 267DEG 23KT 3027 9042 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 4, 7:21 PM CDTSpecial Marine WarningLIX54 min
May 4, 8:03 PM CDTSpecial Weather StatementLIXTangipahoa27 min
May 4, 8:13 PM CDTSpecial Weather StatementLIXWashington17 min
May 4, 8:21 PM CDTSpecial Marine WarningLIX54 min
May 4, 9:06 PM CDTRiver Flood WarningLIXSaint Tammany69 hr
May 4, 10:06 PM CDTSpecial Marine WarningLIX24 min
May 4, 10:25 PM CDTSpecial Marine WarningLIX65 min
May 4, 10:28 PM CDTSevere Thunderstorm WarningLIXSaint John the Baptist, Tangipahoa5 min
May 5, 12:47 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard, Saint Charles, Saint James, Saint John the Baptist103 min
May 5, 1:15 AM CDTSpecial Weather StatementLIXOrleans45 min
May 5, 4:24 AM CDTAreal Flood AdvisoryLIXSaint Tammany3 hr
May 5, 6:16 AM CDTRiver Flood WarningLIXSaint Tammany25 hr
May 5, 6:45 AM CDTAreal Flood AdvisoryLIXSaint Charles, Saint James, Saint John the Baptist2 hr
May 5, 7:01 AM CDTFlash Flood WarningLIXSaint Tammany89 min
May 5, 7:20 AM CDTFlash Flood WarningLIXSaint Charles, Saint James, Saint John the Baptist115 min
May 5, 7:39 AM CDTSpecial Marine WarningLIX36 min
May 5, 7:48 AM CDTAreal Flood AdvisoryLIXOrleans, Saint Tammany117 min
May 5, 8:00 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles2 hr
May 5, 8:25 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard2 hr
May 5, 9:23 AM CDTSpecial Marine WarningLIX67 min
May 5, 10:25 AM CDTSpecial Marine WarningLIX50 min
May 5, 10:31 AM CDTSpecial Marine WarningLIX59 min
May 5, 11:11 AM CDTSpecial Marine WarningLIX49 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.