Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS New Orleans, LA

April 10, 2021Pearl River County, Mississippi; Saint Tammany Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 10, 2021, 12:41 AM CDT for Pearl River County, Mississippi; Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 11 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 10, 2021, 12:41 AM CDT (05:41 UTC)
Expired
Apr 10, 2021, 12:52 AM CDT
In force
11 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

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

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 10, 12:16 AM CDTTornado WatchSPC7 hr
Apr 9, 10:25 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 5.7 hours before the alert went out and 76 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 2021-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2977 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 00:00Z on 2021-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 243 square meters per square second.193958Sfc1 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
2977 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
599 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
243 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
3.4
Supercell composite
18.1

Open this sounding in Storm Lab

The text

As transmitted.

829 
WUUS54 KLIX 100541
SVRLIX
LAC103-117-MSC109-100645-
/O.NEW.KLIX.SV.W.0035.210410T0541Z-210410T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
1241 AM CDT Sat Apr 10 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  North central St. Tammany Parish in southeastern Louisiana...
  Southeastern Washington Parish in southeastern Louisiana...
  Northern Pearl River County in southern Mississippi...

* Until 145 AM CDT.

* At 1241 AM CDT, a severe thunderstorm was located over Sun, or near
  Bogalusa, moving northeast at 50 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...
  Bogalusa, Poplarville, Sun and Crossroads. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 AM CDT for southeastern
Louisiana...and southern Mississippi.

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

&&

LAT...LON 3084 8934 3061 8991 3069 9001 3100 8969
      3100 8955 3101 8955 3101 8951 3100 8947
      3098 8947 3098 8943 3101 8942 3101 8935
TIME...MOT...LOC 0541Z 231DEG 44KT 3069 8991 

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

KLG
1 follow-up statement
297 
WWUS54 KLIX 100552
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
1252 AM CDT Sat Apr 10 2021

LAC103-117-MSC109-100602-
/O.CAN.KLIX.SV.W.0035.000000T0000Z-210410T0645Z/
St. Tammany LA-Washington LA-Pearl River MS-
1252 AM CDT Sat Apr 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL ST. TAMMANY...
SOUTHEASTERN WASHINGTON PARISHES IN SOUTHEASTERN LOUISIANA AND
NORTHERN PEARL RIVER COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However small hail is
still possible with this thunderstorm.

A Tornado Watch remains in effect until 700 AM CDT for southeastern
Louisiana...and southern Mississippi.

LAT...LON 3084 8934 3061 8991 3069 9001 3100 8969
      3100 8955 3101 8955 3101 8951 3100 8947
      3098 8947 3098 8943 3101 8942 3101 8935
TIME...MOT...LOC 0551Z 231DEG 44KT 3078 8978 

$$

KLG

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 11:57 PM CDTSevere Thunderstorm WarningLIXAmite, Pike36 min
Apr 10, 12:12 AM CDTSevere Thunderstorm WarningLIXWalthall33 min
Apr 10, 12:14 AM CDTSpecial Weather StatementLIXWilkinson46 min
Apr 10, 12:46 AM CDTSevere Thunderstorm WarningLIXAmite, Pike, Walthall43 min
Apr 10, 1:33 AM CDTSpecial Weather StatementLIXPearl River42 min
Apr 10, 1:45 AM CDTTornado WarningLIXWilkinson45 min
Apr 10, 1:52 AM CDTSpecial Weather StatementLIXPearl River38 min
Apr 10, 2:01 AM CDTSevere Thunderstorm WarningLIXPearl River29 min
Apr 10, 2:05 AM CDTTornado WarningLIXPearl River10 min
Apr 10, 2:42 AM CDTSevere Thunderstorm WarningLIXHancock, Harrison33 min
Apr 10, 2:58 AM CDTSevere Thunderstorm WarningLIXAmite, Pike35 min
Apr 10, 3:11 AM CDTSevere Thunderstorm WarningLIXHarrison, Jackson49 min
Apr 10, 3:20 AM CDTSevere Thunderstorm WarningLIXAmite, Wilkinson33 min
Apr 10, 3:29 AM CDTSevere Thunderstorm WarningLIXHarrison, Jackson31 min
Apr 10, 3:36 AM CDTSpecial Weather StatementLIXPearl River39 min
Apr 10, 3:55 AM CDTSevere Thunderstorm WarningLIXHarrison, Jackson14 min
Apr 10, 4:06 AM CDTFlash Flood WarningLIXHancock, Pearl River3 hr
Apr 10, 5:07 AM CDTSpecial Weather StatementLIXHancock23 min
Apr 10, 5:35 AM CDTSpecial Weather StatementLIXHarrison25 min
Apr 10, 6:02 AM CDTAreal Flood AdvisoryLIXJackson3 hr
Apr 10, 9:49 AM CDTRiver Flood WarningLIXPike, Walthall56 hr
Apr 10, 9:58 AM CDTRiver Flood WarningLIXHarrison25 hr
Apr 10, 1:07 AM CDTSpecial Marine WarningLIX22 min
Apr 10, 1:40 AM CDTSpecial Marine WarningLIX20 min
Apr 10, 2:28 AM CDTSevere Thunderstorm WarningLIXPointe Coupee, West Feliciana47 min
Apr 10, 2:48 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Saint Helena, West Feliciana39 min
Apr 10, 3:25 AM CDTSpecial Weather StatementLIXSaint Helena, Tangipahoa65 min
Apr 10, 3:26 AM CDTSpecial Weather StatementLIXAscension, Assumption, Livingston, Saint James, Saint John the Baptist64 min
Apr 10, 3:38 AM CDTSpecial Marine WarningLIX67 min
Apr 10, 3:59 AM CDTSpecial Weather StatementLIXEast Baton Rouge46 min
Apr 10, 4:16 AM CDTSpecial Marine WarningLIX59 min
Apr 10, 4:23 AM CDTTornado WarningLIXSaint James, Saint John the Baptist19 min
Apr 10, 4:40 AM CDTFlash Flood WarningLIXSaint Tammany, Tangipahoa, Washington3 hr
Apr 10, 4:47 AM CDTSpecial Weather StatementLIXAscension, Assumption, Orleans, Saint Charles, Saint James, Saint John the Baptist and 1 more58 min
Apr 10, 4:58 AM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint Tammany47 min
Apr 10, 5:16 AM CDTFlash Flood WarningLIXOrleans3 hr
Apr 10, 5:23 AM CDTSpecial Marine WarningLIX67 min
Apr 10, 5:24 AM CDTFlash Flood WarningLIXSaint Bernard3 hr
Apr 10, 5:46 AM CDTSpecial Weather StatementLIXAssumption, Jefferson, Orleans, Saint Charles59 min
Apr 10, 6:07 AM CDTAreal Flood AdvisoryLIXJefferson, Lafourche, Orleans, Saint Charles, Saint John the Baptist, Terrebonne2 hr
Apr 10, 6:24 AM CDTSpecial Marine WarningLIX96 min
Apr 10, 6:29 AM CDTFlash Flood WarningLIXLafourche, Terrebonne89 min
Apr 10, 6:33 AM CDTFlash Flood WarningLIXJefferson, Plaquemines105 min
Apr 10, 6:42 AM CDTSpecial Weather StatementLIXJefferson, Lafourche, Plaquemines, Terrebonne78 min
Apr 10, 7:13 AM CDTSpecial Marine WarningLIX92 min
Apr 10, 7:53 AM CDTSpecial Marine WarningLIX97 min
Apr 10, 8:52 AM CDTRiver Flood WarningLIXSaint Tammany10 days
Apr 10, 8:52 AM CDTRiver Flood WarningLIXSaint Tammany24 hr
Apr 10, 8:55 AM CDTRiver Flood WarningLIXSaint Tammany25 hr
Apr 10, 9:49 AM CDTRiver Flood WarningLIXWashington33 hr
Apr 10, 11:15 AM CDTSpecial Weather StatementLIXTerrebonne30 min
Apr 10, 11:51 AM CDTSpecial Weather StatementLIXLafourche39 min
Apr 10, 12:28 PM CDTSpecial Weather StatementLIXJefferson32 min
Apr 10, 5:46 PM CDTRiver Flood WarningLIXSaint Helena26 hr

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.