Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 152, NWS New Orleans, LA

December 6, 2021Saint Tammany Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Dec 6, 2021, 2:21 PM CST for Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 39 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, 2:21 PM CST (20:21 UTC)
Expired
Dec 6, 2021, 3:00 PM CST
In force
39 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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.4 hours before the alert went out and 59 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.

086 
WUUS54 KLIX 062021
SVRLIX
LAC103-117-062100-
/O.NEW.KLIX.SV.W.0152.211206T2021Z-211206T2100Z/

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

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Northwestern St. Tammany Parish in southeastern Louisiana...
  Southern Washington Parish in southeastern Louisiana...

* Until 300 PM CST.

* At 221 PM CST, a severe thunderstorm was located over Enon, or 9
  miles south 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...
  Bogalusa, Folsom, Sun, Enon and Bush. 

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 3086 8978 3083 8978 3079 8982 3076 8983
      3072 8983 3070 8985 3067 8984 3054 8990
      3060 9025 3066 9025 3071 9026 3082 9019
TIME...MOT...LOC 2021Z 279DEG 21KT 3072 9010 

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, 1:54 PM CSTSevere Thunderstorm WarningLIXSaint Helena, Tangipahoa66 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.