Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 151, NWS New Orleans, LA

December 6, 2021Saint Helena Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Dec 6, 2021, 1:54 PM CST for Saint Helena Parish, Tangipahoa Parish, Louisiana. It was in force for 66 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
Dec 6, 2021, 1:54 PM CST (19:54 UTC)
Expired
Dec 6, 2021, 3:00 PM CST
In force
66 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Saint Helena Parish, LA, Tangipahoa Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.9 hours before the alert went out and 86 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 2021-12-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 720 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 12:00Z on 2021-12-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
720 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.4

Open this sounding in Storm Lab

The text

As transmitted.

740 
WUUS54 KLIX 061954
SVRLIX
LAC091-105-062100-
/O.NEW.KLIX.SV.W.0151.211206T1954Z-211206T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
154 PM CST Mon Dec 6 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  East central St. Helena Parish in southeastern Louisiana...
  Central Tangipahoa Parish in southeastern Louisiana...

* Until 300 PM CST.

* At 154 PM CST, a severe thunderstorm was located near Amite City,
  or near Amite, moving east at 25 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, Natalbany, Robert and
  Tickfaw.

This includes Interstate 55 in Louisiana between mile markers 34 and
48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3076 9056 3063 9031 3071 9026 3060 9024
      3055 9025 3049 9024 3054 9057 3074 9056
      3075 9064 3085 9058 3085 9053
TIME...MOT...LOC 1954Z 280DEG 21KT 3075 9058 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CAB
3 follow-up statements
807 
WWUS54 KLIX 062006
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
206 PM CST Mon Dec 6 2021

LAC091-062016-
/O.CAN.KLIX.SV.W.0151.000000T0000Z-211206T2100Z/
St. Helena LA-
206 PM CST Mon Dec 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ST. HELENA PARISH
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3076 9056 3063 9031 3071 9026 3060 9024
      3055 9025 3049 9024 3054 9057 3074 9056
      3074 9057 3085 9057 3085 9053
TIME...MOT...LOC 2006Z 280DEG 21KT 3074 9050 

$$

LAC105-062100-
/O.CON.KLIX.SV.W.0151.000000T0000Z-211206T2100Z/
Tangipahoa LA-
206 PM CST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CST
FOR CENTRAL TANGIPAHOA PARISH...

At 206 PM CST, a severe thunderstorm was located over Amite, moving
east at 25 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, Natalbany, Robert and
Tickfaw.

This includes Interstate 55 in Louisiana between mile markers 34 and
48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3076 9056 3063 9031 3071 9026 3060 9024
      3055 9025 3049 9024 3054 9057 3074 9056
      3074 9057 3085 9057 3085 9053
TIME...MOT...LOC 2006Z 280DEG 21KT 3074 9050 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CAB
528 
WWUS54 KLIX 062014
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
214 PM CST Mon Dec 6 2021

LAC105-062100-
/O.CON.KLIX.SV.W.0151.000000T0000Z-211206T2100Z/
Tangipahoa LA-
214 PM CST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CST
FOR CENTRAL TANGIPAHOA PARISH...

At 214 PM CST, a severe thunderstorm was located near Amite, moving
east at 25 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, Natalbany, Robert and
Tickfaw.

This includes Interstate 55 in Louisiana between mile markers 34 and
47.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3063 9031 3071 9026 3060 9024 3055 9025
      3049 9024 3054 9057 3070 9056 3074 9052
TIME...MOT...LOC 2014Z 280DEG 21KT 3073 9045 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CAB
427 
WWUS54 KLIX 062046
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
246 PM CST Mon Dec 6 2021

LAC105-062100-
/O.CON.KLIX.SV.W.0151.000000T0000Z-211206T2100Z/
Tangipahoa LA-
246 PM CST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CST
FOR EAST CENTRAL TANGIPAHOA PARISH...

At 246 PM CST, a severe thunderstorm was located near Folsom, or 11
miles southwest of Franklinton, moving east at 25 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Robert.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3061 9031 3071 9026 3060 9024 3055 9025
      3049 9024 3051 9037
TIME...MOT...LOC 2046Z 280DEG 21KT 3070 9024 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CAB

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 6, 11:08 AM CSTSpecial Weather StatementLIXEast Feliciana67 min
Dec 6, 12:01 PM CSTSpecial Weather StatementLIXSaint Helena74 min
Dec 6, 12:21 PM CSTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena54 min
Dec 6, 12:46 PM CSTSevere Thunderstorm WarningLIXTangipahoa, Washington59 min
Dec 6, 1:22 PM CSTTornado WarningLIXTangipahoa, Washington68 min
Dec 6, 1:29 PM CSTSevere Thunderstorm WarningLIXSaint Helena, Tangipahoa, Washington61 min
Dec 6, 1:40 PM CSTSpecial Weather StatementLIXSaint Helena65 min
Dec 6, 1:44 PM CSTSevere Thunderstorm WarningLIXLivingston, Saint Helena61 min
Dec 6, 2:21 PM CSTSevere Thunderstorm WarningLIXSaint Tammany, Washington39 min
Dec 6, 2:24 PM CSTTornado WarningLIXWashington21 min
Dec 6, 2:30 PM CSTSevere Thunderstorm WarningLIXLivingston, Saint Tammany, Tangipahoa60 min
Dec 6, 2:35 PM CSTTornado WarningLIXSaint Tammany, Washington55 min
Dec 6, 2:41 PM CSTSpecial Marine WarningLIX64 min
Dec 6, 2:51 PM CSTFlash Flood WarningLIXAscension, East Baton Rouge, West Baton Rouge116 min
Dec 6, 2:51 PM CSTTornado WarningLIXSaint Tammany39 min
Dec 6, 2:56 PM CSTTornado WarningLIXSaint Tammany49 min
Dec 6, 3:09 PM CSTSevere Thunderstorm Warning Considerable damage threatLIXSaint Tammany66 min
Dec 6, 3:20 PM CSTTornado WarningLIXSaint Tammany30 min
Dec 6, 3:26 PM CSTSpecial Marine WarningLIX64 min
Dec 6, 4:14 PM CSTSpecial Marine WarningLIX91 min
Dec 6, 5:24 PM CSTSpecial Marine WarningLIX66 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.