Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS New Orleans, LA

March 23, 2021Saint Tammany Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Mar 23, 2021, 11:39 AM CDT for Saint Tammany Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Mississippi. It was in force for 51 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
Mar 23, 2021, 11:39 AM CDT (16:39 UTC)
Expired
Mar 23, 2021, 12:30 PM CDT
In force
51 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Saint Tammany Parish, LA, Washington Parish, LA, Hancock County, MS, Pearl River County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.7 hours before the alert went out and 40 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 12:00Z on 2021-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2021-03-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
13 J/kg
Mixed-layer CIN
-246 J/kg
Mixed-layer LCL
759 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

888 
WUUS54 KLIX 231639
SVRLIX
LAC103-117-MSC045-109-231730-
/O.NEW.KLIX.SV.W.0013.210323T1639Z-210323T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1139 AM CDT Tue Mar 23 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northeastern St. Tammany Parish in southeastern Louisiana...
  Southeastern Washington Parish in southeastern Louisiana...
  West central Hancock County in southern Mississippi...
  Southwestern Pearl River County in southern Mississippi...

* Until 1230 PM CDT.

* At 1139 AM CDT, a severe thunderstorm was located over Sun, or 10
  miles southwest of Bogalusa, moving east at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Picayune, Sun and Bush. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3058 9005 3075 8998 3063 8955 3038 8966
TIME...MOT...LOC 1639Z 290DEG 29KT 3064 8994 

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

MSW
2 follow-up statements
063 
WWUS54 KLIX 231653
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1153 AM CDT Tue Mar 23 2021

LAC103-117-MSC045-109-231730-
/O.CON.KLIX.SV.W.0013.000000T0000Z-210323T1730Z/
St. Tammany LA-Washington LA-Hancock MS-Pearl River MS-
1153 AM CDT Tue Mar 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR NORTHEASTERN ST. TAMMANY AND SOUTHEASTERN WASHINGTON PARISHES...
WEST CENTRAL HANCOCK AND SOUTHWESTERN PEARL RIVER COUNTIES...

At 1152 AM CDT, a severe thunderstorm was located near Bush, or 9
miles northwest of Picayune, moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Picayune, Sun and Bush. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Thunderstorm lines can produce brief tornadoes and concentrated 
wind damage. Although a tornado is not immediately likely, it is 
best to move to an interior room on the lowest floor of a building. 
This storm may cause serious injury and significant property damage.

&&

LAT...LON 3052 8994 3062 8994 3069 8992 3071 8983
      3063 8955 3038 8966
TIME...MOT...LOC 1652Z 290DEG 29KT 3060 8982 

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

Klein
036 
WWUS54 KLIX 231712
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1212 PM CDT Tue Mar 23 2021

LAC103-117-231721-
/O.CAN.KLIX.SV.W.0013.000000T0000Z-210323T1730Z/
St. Tammany LA-Washington LA-
1212 PM CDT Tue Mar 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ST. TAMMANY AND
SOUTHEASTERN WASHINGTON PARISHES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warning area. Therefore, the warning has been cancelled.

LAT...LON 3063 8955 3051 8960 3044 8963 3047 8970
      3050 8974 3061 8968 3063 8957
TIME...MOT...LOC 1711Z 290DEG 29KT 3055 8965 

$$

MSC045-109-231730-
/O.CON.KLIX.SV.W.0013.000000T0000Z-210323T1730Z/
Hancock MS-Pearl River MS-
1212 PM CDT Tue Mar 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 PM CDT
FOR NORTHWESTERN HANCOCK AND SOUTH CENTRAL PEARL RIVER COUNTIES...

At 1211 PM CDT, a severe thunderstorm was located over Picayune,
moving east at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Picayune.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3063 8955 3051 8960 3044 8963 3047 8970
      3050 8974 3061 8968 3063 8957
TIME...MOT...LOC 1711Z 290DEG 29KT 3055 8965 

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

Klein

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 23, 3:57 AM CDTWind AdvisoryLIXSaint Bernard, Saint John the Baptist11 hr
Mar 23, 6:24 AM CDTSpecial Weather StatementLIXPointe Coupee, West Feliciana66 min
Mar 23, 6:40 AM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana35 min
Mar 23, 7:09 AM CDTSevere Thunderstorm WarningLIXEast Feliciana, Pointe Coupee, West Feliciana51 min
Mar 23, 7:47 AM CDTSevere Thunderstorm WarningLIXEast Feliciana, West Feliciana43 min
Mar 23, 8:00 AM CDTSpecial Weather StatementLIXPointe Coupee30 min
Mar 23, 8:33 AM CDTSpecial Weather StatementLIXWest Feliciana27 min
Mar 23, 9:00 AM CDTSpecial Weather StatementLIXEast Feliciana30 min
Mar 23, 9:11 AM CDTSpecial Weather StatementLIXPointe Coupee34 min
Mar 23, 9:29 AM CDTSpecial Weather StatementLIXSaint Helena31 min
Mar 23, 9:42 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge34 min
Mar 23, 10:41 AM CDTRiver Flood WarningLIXSaint Tammany65 days
Mar 23, 10:41 AM CDTRiver Flood WarningLIXSaint Tammany7 days
Mar 23, 10:51 AM CDTRiver Flood WarningLIXSaint Helena62 hr
Mar 23, 10:54 AM CDTRiver Flood WarningLIXTangipahoa6 days
Mar 23, 10:57 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Mar 23, 11:01 AM CDTRiver Flood WarningLIXSaint Tammany4 days
Mar 23, 11:22 AM CDTSpecial Weather StatementLIXAssumption23 min
Mar 23, 11:25 AM CDTSpecial Weather StatementLIXSaint Tammany35 min
Mar 23, 11:46 AM CDTRiver Flood WarningLIXEast Baton Rouge, West Baton Rouge35 days
Mar 23, 11:49 AM CDTSevere Thunderstorm WarningLIXSaint Tammany41 min
Mar 23, 12:06 PM CDTSpecial Marine WarningLIX54 min
Mar 23, 12:47 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard3 hr
Mar 23, 12:55 PM CDTAreal Flood AdvisoryLIXSaint Tammany3 hr
Mar 23, 1:08 PM CDTFlash Flood WarningLIXJefferson, Orleans2 hr
Mar 23, 1:18 PM CDTFlash Flood WarningLIXSaint Bernard2 hr
Mar 23, 1:20 PM CDTSpecial Marine WarningLIX85 min
Mar 23, 1:48 PM CDTAreal Flood AdvisoryLIXJefferson, Saint Charles3 hr
Mar 23, 2:38 PM CDTSpecial Marine WarningLIX97 min
Mar 23, 3:25 PM CDTAreal Flood AdvisoryLIXLafourche3 hr
Mar 23, 3:27 PM CDTAreal Flood AdvisoryLIXLafourche, Terrebonne3 hr
Mar 23, 3:38 PM CDTAreal Flood AdvisoryLIXLafourche, Terrebonne3 hr
Mar 23, 4:05 PM CDTFlash Flood WarningLIXLafourche, Terrebonne9 hr
Mar 23, 4:09 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard3 hr
Mar 23, 8:30 AM CDTSpecial Weather StatementLIXAmite30 min
Mar 23, 9:57 AM CDTSpecial Weather StatementLIXPike33 min
Mar 23, 10:13 AM CDTRiver Flood WarningLIXHarrison70 hr
Mar 23, 10:13 AM CDTRiver Flood WarningLIXHarrison4 days
Mar 23, 10:31 AM CDTSpecial Weather StatementLIXWalthall29 min
Mar 23, 10:41 AM CDTRiver Flood WarningLIXPearl River4 days
Mar 23, 10:41 AM CDTRiver Flood WarningLIXPike, Walthall62 hr
Mar 23, 11:39 AM CDTRiver Flood WarningLIXJackson21 days
Mar 23, 12:11 PM CDTSevere Thunderstorm WarningLIXHancock, Harrison, Pearl River38 min
Mar 23, 12:20 PM CDTSpecial Weather StatementLIXHancock25 min
Mar 23, 12:41 PM CDTSpecial Weather StatementLIXHarrison34 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021Severe Thunderstorm Warnings in Mississippi, 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.