Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 138, NWS New Orleans, LA

October 27, 20216 parishes in Louisiana; Amite County, Pike County, Wilkinson County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at Oct 27, 2021, 3:56 PM CDT for 6 parishes in Louisiana; Amite County, Pike County, Wilkinson County, Mississippi. It was in force for 49 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
Oct 27, 2021, 3:56 PM CDT (20:56 UTC)
Expired
Oct 27, 2021, 4:45 PM CDT
In force
49 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Saint Helena Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Pike County, MS, Wilkinson County, MS

The watch it was issued in

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

IssuedProductOfficeLasted
Oct 27, 1:53 PM CDTTornado WatchSPC8 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.9 hours before the alert went out and 143 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 2021-10-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2021-10-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1792 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

276 
WUUS54 KLIX 272056
SVRLIX
LAC033-037-047-063-091-121-MSC005-113-157-272145-
/O.NEW.KLIX.SV.W.0138.211027T2056Z-211027T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
356 PM CDT Wed Oct 27 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  West Baton Rouge Parish in southeastern Louisiana...
  St. Helena Parish in southeastern Louisiana...
  Northwestern Livingston Parish in southeastern Louisiana...
  East Feliciana Parish in southeastern Louisiana...
  North central Iberville Parish in southeastern Louisiana...
  East Baton Rouge Parish in southeastern Louisiana...
  Northwestern Pike County in southern Mississippi...
  Southeastern Wilkinson County in southern Mississippi...
  Amite County in southern Mississippi...

* Until 445 PM CDT.

* At 355 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles southeast of Garden City to near Gloster to
  near Jackson to near Port Allen, moving northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Baton Rouge, Zachary, Baker, Mccomb, Denham Springs, Port Allen,
  Jackson, Clinton, Liberty, Greensburg, Oak Hills Place, Addis,
  Brusly, Summit, Centreville, Slaughter, Gloster, Grosse Tete,
  Wilson and Norwood.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 141 and 163.
 Interstate 12 between mile markers 1 and 8.
 Interstate 55 in Mississippi between mile markers 14 and 24.
 Interstate 110 in Louisiana between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana...and southern Mississippi.

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

&&

LAT...LON 3135 9043 3114 9050 3072 9072 3056 9086
      3035 9111 3032 9147 3117 9108 3133 9108
      3135 9102 3133 9099 3135 9098
TIME...MOT...LOC 2055Z 238DEG 35KT 3132 9101 3119 9095 3081 9115 3047
9125

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

$$

JRK
1 follow-up statement
778 
WWUS54 KLIX 272123
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
423 PM CDT Wed Oct 27 2021

LAC047-MSC157-272132-
/O.CAN.KLIX.SV.W.0138.000000T0000Z-211027T2145Z/
Iberville LA-Wilkinson MS-
423 PM CDT Wed Oct 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL IBERVILLE PARISH
IN SOUTHEASTERN LOUISIANA AND SOUTHEASTERN WILKINSON COUNTIES IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana...and southern Mississippi.

LAT...LON 3135 9043 3110 9052 3066 9077 3035 9111
      3033 9131 3035 9133 3063 9105 3099 9090
      3115 9088 3128 9083 3135 9084
TIME...MOT...LOC 2122Z 251DEG 36KT 3139 9073 3126 9067 3086 9082 3054
9094

$$

LAC033-037-063-091-121-MSC005-113-272145-
/O.CON.KLIX.SV.W.0138.000000T0000Z-211027T2145Z/
West Baton Rouge LA-St. Helena LA-Livingston LA-East Feliciana LA-
East Baton Rouge LA-Pike MS-Amite MS-
423 PM CDT Wed Oct 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR SOUTHEASTERN WEST BATON ROUGE...ST. HELENA...NORTHWESTERN
LIVINGSTON...EASTERN EAST FELICIANA AND CENTRAL EAST BATON ROUGE
PARISHES...NORTHWESTERN PIKE AND AMITE COUNTIES...

At 422 PM CDT, severe thunderstorms were located along a line
extending from Little Springs to near Smithdale to near Darlington to
near Watson, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Baton Rouge, Mccomb, Denham Springs, Port Allen, Liberty, Greensburg,
Oak Hills Place, Addis, Brusly, Summit, Smithdale, Westminster,
Merrydale, Inniswold, Watson, Darlington, Gillsberg, Pride, Gardere
and Brownfields.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 153 and 163.
 Interstate 12 between mile markers 1 and 7.
 Interstate 55 in Mississippi between mile markers 14 and 24.
 Interstate 110 in Louisiana between mile markers 1 and 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
Louisiana...and southern Mississippi.

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

Squall lines can produce brief tornadoes and more widespread 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. These 
storms may cause serious injury and significant property damage.

&&

LAT...LON 3135 9043 3110 9052 3066 9077 3035 9111
      3033 9131 3035 9133 3063 9105 3099 9090
      3115 9088 3128 9083 3135 9084
TIME...MOT...LOC 2122Z 251DEG 36KT 3139 9073 3126 9067 3086 9082 3054
9094

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

$$

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 27, 1:47 PM CDTTornado WarningLIXEast Baton Rouge, East Feliciana43 min
Oct 27, 1:48 PM CDTTornado WarningLIXEast Feliciana, West Feliciana42 min
Oct 27, 1:51 PM CDTSpecial Marine WarningLIX41 min
Oct 27, 2:03 PM CDTTornado WarningLIXLivingston, Tangipahoa42 min
Oct 27, 2:16 PM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Feliciana59 min
Oct 27, 3:10 PM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana50 min
Oct 27, 3:17 PM CDTSpecial Marine WarningLIX28 min
Oct 27, 3:19 PM CDTTornado WarningLIXEast Feliciana, West Feliciana26 min
Oct 27, 3:22 PM CDTSpecial Marine WarningLIX53 min
Oct 27, 4:06 PM CDTSevere Thunderstorm WarningLIXAscension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 1 more39 min
Oct 27, 4:46 PM CDTSevere Thunderstorm WarningLIXAscension, Assumption, East Baton Rouge, Iberville, Lafourche, Livingston and 4 more44 min
Oct 27, 4:54 PM CDTAreal Flood AdvisoryLIXLivingston, Saint Tammany, Tangipahoa, Washington3 hr
Oct 27, 4:59 PM CDTSpecial Marine WarningLIX91 min
Oct 27, 5:19 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington26 min
Oct 27, 5:22 PM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Lafourche, Livingston, Saint Charles, Saint James and 2 more38 min
Oct 27, 5:26 PM CDTSpecial Marine WarningLIX94 min
Oct 27, 5:28 PM CDTFlash Flood WarningLIXSaint Tammany, Tangipahoa, Washington3 hr
Oct 27, 5:56 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 2 more49 min
Oct 27, 6:10 PM CDTSevere Thunderstorm WarningLIXSaint Tammany50 min
Oct 27, 6:19 PM CDTFlash Flood WarningLIXSaint Tammany, Washington2 hr
Oct 27, 6:23 PM CDTSpecial Marine WarningLIX97 min
Oct 27, 6:28 PM CDTTornado WarningLIXJefferson, Lafourche32 min
Oct 27, 6:37 PM CDTSpecial Marine WarningLIX83 min
Oct 27, 6:47 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Bernard, Saint Charles109 min
Oct 27, 6:49 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard41 min
Oct 27, 6:53 PM CDTAreal Flood AdvisoryLIXSaint Tammany3 hr
Oct 27, 2:32 PM CDTSevere Thunderstorm WarningLIXWilkinson58 min
Oct 27, 3:04 PM CDTTornado WarningLIXWilkinson26 min
Oct 27, 4:53 PM CDTSpecial Weather StatementLIXPike, Walthall37 min
Oct 27, 6:49 PM CDTSevere Thunderstorm WarningLIXHancock, Pearl River41 min
Oct 27, 6:52 PM CDTTornado WarningLIXHancock, Pearl River12 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.