Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 153, NWS New Orleans, LA

December 6, 2021Livingston Parish, Saint Tammany Parish, Tangipahoa Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Dec 6, 2021, 2:30 PM CST for Livingston Parish, Saint Tammany Parish, Tangipahoa Parish, Louisiana. It was in force for 60 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 6, 2021, 2:30 PM CST (20:30 UTC)
Expired: Dec 6, 2021, 3:30 PM CST
In force: 60 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Livingston Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA

What was reported inside it

Time	Report	Where	Remark
Dec 6, 2:56 PM CST	TORNADO	3 Se Covington, LA	A TORNADO TOUCHED DOWN NEAR HWY 190 AND HOLLYCREST BLVD IN COVINGTON WHERE DAMAGE WAS FIRST NOTED IN THE HOLLYCREST PLAZA SHOPPING MALL. A PORTION OF THE NORTH-FACING EXTERIOR WALL OF THE BUILDING COMPLEX COLLAPSED. THERE WAS ALSO MINOR ROOF DAMAGE AND THE FEN
Dec 6, 3:02 PM CST	TSTM WND DMG	3 S Abita Springs, LA	SEVERAL SMALL PINE TREES UPROOTED AND LARGE BRANCHES SNAPPED ON LAMBERT CT AND ROWELL ST. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.5 hours before the alert went out and 46 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

113 
WUUS54 KLIX 062030
SVRLIX
LAC063-103-105-062130-
/O.NEW.KLIX.SV.W.0153.211206T2030Z-211206T2130Z/

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

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Southwestern St. Tammany Parish in southeastern Louisiana...
  Southeastern Livingston Parish in southeastern Louisiana...
  Southern Tangipahoa Parish in southeastern Louisiana...

* Until 330 PM CST.

* At 230 PM CST, a severe thunderstorm was located near Ponchatoula,
  or near Hammond, moving east at 50 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Hammond, Covington, Ponchatoula, Abita Springs, Madisonville,
  Springfield, Robert, Lacombe and Killian.

This includes the following Interstates...
 Interstate 12 between mile markers 39 and 72.
 Interstate 55 in Louisiana between mile markers 18 and 28.

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 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3038 9023 3030 9030 3037 9056
      3062 9037
TIME...MOT...LOC 2030Z 271DEG 44KT 3047 9040 

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

$$

CAB

3 follow-up statements

990 
WWUS54 KLIX 062047
SVSLIX

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

LAC063-062056-
/O.CAN.KLIX.SV.W.0153.000000T0000Z-211206T2130Z/
Livingston LA-
247 PM CST Mon Dec 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LIVINGSTON 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 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3038 9023 3030 9030 3034 9044
      3060 9026
TIME...MOT...LOC 2046Z 271DEG 44KT 3047 9016 

$$

LAC103-105-062130-
/O.CON.KLIX.SV.W.0153.000000T0000Z-211206T2130Z/
St. Tammany LA-Tangipahoa LA-
247 PM CST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CST
FOR SOUTHWESTERN ST. TAMMANY AND SOUTHEASTERN TANGIPAHOA PARISHES...

At 246 PM CST, a severe thunderstorm was located near Covington,
moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Covington, Abita Springs, Madisonville and Lacombe. 

This includes the following Interstates...
 Interstate 12 between mile markers 47 and 72.
 Interstate 55 in Louisiana between mile markers 18 and 20.

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 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3038 9023 3030 9030 3034 9044
      3060 9026
TIME...MOT...LOC 2046Z 271DEG 44KT 3047 9016 

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

$$

CAB

911 
WWUS54 KLIX 062101
SVSLIX

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

LAC105-062111-
/O.CAN.KLIX.SV.W.0153.000000T0000Z-211206T2130Z/
Tangipahoa LA-
301 PM CST Mon Dec 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TANGIPAHOA 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 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3039 9021 3056 9011
TIME...MOT...LOC 2101Z 274DEG 38KT 3044 9002 

$$

LAC103-062130-
/O.CON.KLIX.SV.W.0153.000000T0000Z-211206T2130Z/
St. Tammany LA-
301 PM CST Mon Dec 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM CST
FOR SOUTHWESTERN ST. TAMMANY PARISH...

At 301 PM CST, a severe thunderstorm was located over Abita Springs,
or near Covington, moving east at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Covington, Abita Springs, Madisonville and Lacombe. 

This includes Interstate 12 between mile markers 58 and 72.
 
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 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3039 9021 3056 9011
TIME...MOT...LOC 2101Z 274DEG 38KT 3044 9002 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

CAB

588 
WWUS54 KLIX 062130
SVSLIX

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

LAC103-062139-
/O.EXP.KLIX.SV.W.0153.000000T0000Z-211206T2130Z/
St. Tammany LA-
330 PM CST Mon Dec 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ST. TAMMANY
PARISH WILL EXPIRE AT 330 PM CST...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning will be allowed to expire.

LAT...LON 3054 8988 3026 8998 3030 8999 3035 9006
      3039 9019 3039 9021 3056 9011
TIME...MOT...LOC 2129Z 271DEG 44KT 3043 8963 

$$

CAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 6, 11:08 AM CST	Special Weather Statement	LIX	East Feliciana	67 min
Dec 6, 12:01 PM CST	Special Weather Statement	LIX	Saint Helena	74 min
Dec 6, 12:21 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, Saint Helena	54 min
Dec 6, 12:46 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa, Washington	59 min
Dec 6, 1:22 PM CST	Tornado Warning	LIX	Tangipahoa, Washington	68 min
Dec 6, 1:29 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa, Washington	61 min
Dec 6, 1:40 PM CST	Special Weather Statement	LIX	Saint Helena	65 min
Dec 6, 1:44 PM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena	61 min
Dec 6, 1:54 PM CST	Severe Thunderstorm Warning	LIX	Saint Helena, Tangipahoa	66 min
Dec 6, 2:21 PM CST	Severe Thunderstorm Warning	LIX	Saint Tammany, Washington	39 min
Dec 6, 2:24 PM CST	Tornado Warning	LIX	Washington	21 min
Dec 6, 2:35 PM CST	Tornado Warning	LIX	Saint Tammany, Washington	55 min
Dec 6, 2:41 PM CST	Special Marine Warning	LIX		64 min
Dec 6, 2:51 PM CST	Flash Flood Warning	LIX	Ascension, East Baton Rouge, West Baton Rouge	116 min
Dec 6, 2:51 PM CST	Tornado Warning	LIX	Saint Tammany	39 min
Dec 6, 2:56 PM CST	Tornado Warning	LIX	Saint Tammany	49 min
Dec 6, 3:09 PM CST	Severe Thunderstorm Warning Considerable damage threat	LIX	Saint Tammany	66 min
Dec 6, 3:20 PM CST	Tornado Warning	LIX	Saint Tammany	30 min
Dec 6, 3:26 PM CST	Special Marine Warning	LIX		64 min
Dec 6, 4:14 PM CST	Special Marine Warning	LIX		91 min
Dec 6, 5:24 PM CST	Special Marine Warning	LIX		66 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.