Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS New Orleans, LA

May 10, 20216 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 10, 2021, 8:28 AM CDT for 6 parishes in Louisiana. It was in force for 62 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
May 10, 2021, 8:28 AM CDT (13:28 UTC)
Expired
May 10, 2021, 9:30 AM CDT
In force
62 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Ascension Parish, LA, East Baton Rouge Parish, LA, Iberville Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, West Baton Rouge Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.5 hours before the alert went out and 161 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 2021-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 161 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 2021-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
161 J/kg
Mixed-layer CIN
-137 J/kg
Mixed-layer LCL
943 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

945 
WUUS54 KLIX 101328
SVRLIX
LAC005-033-047-063-077-121-101430-
/O.NEW.KLIX.SV.W.0098.210510T1328Z-210510T1430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service New Orleans LA
828 AM CDT Mon May 10 2021

The National Weather Service in New Orleans has issued a

* Severe Thunderstorm Warning for...
  Western Ascension Parish in southeastern Louisiana...
  West Baton Rouge Parish in southeastern Louisiana...
  Southeastern Pointe Coupee Parish in southeastern Louisiana...
  West central Livingston Parish in southeastern Louisiana...
  Iberville Parish in southeastern Louisiana...
  Southwestern East Baton Rouge Parish in southeastern Louisiana...

* Until 930 AM CDT.

* At 827 AM CDT, a severe thunderstorm was located near Grosse Tete,
  or 10 miles west of Plaquemine, moving east at 35 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Baton Rouge, Baker, Denham Springs, Gonzales, Donaldsonville,
  Plaquemine, Port Allen, Oak Hills Place, St. Gabriel, Walker,
  Addis, Brusly, White Castle, Livonia, Maringouin, Rosedale, Grosse
  Tete, Westminster, Geismar and Erwinville.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 128 and 180.
 Interstate 12 between mile markers 1 and 16.
 Interstate 110 in Louisiana between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3038 9163 3045 9164 3068 9146 3050 9085
      3008 9094 3006 9096 3008 9100 3007 9104
      3017 9147 3020 9149 3023 9148 3024 9157
      3032 9163 3035 9163 3036 9164
TIME...MOT...LOC 1327Z 283DEG 38KT 3034 9141 

HAIL...0.75IN
WIND...60MPH
 
$$

LN
2 follow-up statements
164 
WWUS54 KLIX 101348
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
848 AM CDT Mon May 10 2021

LAC077-101358-
/O.CAN.KLIX.SV.W.0098.000000T0000Z-210510T1430Z/
Pointe Coupee LA-
848 AM CDT Mon May 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN POINTE COUPEE
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 3044 9148 3062 9127 3050 9085 3008 9094
      3006 9096 3008 9100 3007 9104 3017 9147
      3020 9149 3023 9148 3024 9157 3032 9159
TIME...MOT...LOC 1348Z 283DEG 38KT 3029 9116 

$$

LAC005-033-047-063-121-101430-
/O.CON.KLIX.SV.W.0098.000000T0000Z-210510T1430Z/
Ascension LA-West Baton Rouge LA-Livingston LA-Iberville LA-
East Baton Rouge LA-
848 AM CDT Mon May 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM CDT
FOR WESTERN ASCENSION...WEST BATON ROUGE...WEST CENTRAL LIVINGSTON...
IBERVILLE AND SOUTHWESTERN EAST BATON ROUGE PARISHES...

At 848 AM CDT, a severe thunderstorm was located near St. Gabriel, or
near Plaquemine, moving east at 45 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Baton Rouge, Baker, Denham Springs, Gonzales, Donaldsonville,
Plaquemine, Port Allen, Oak Hills Place, St. Gabriel, Walker, Addis,
Brusly, White Castle, Rosedale, Grosse Tete, Westminster, Geismar,
Ramah, Bayou Sorrel and Shenandoah.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 135 and 180.
 Interstate 12 between mile markers 1 and 16.
 Interstate 110 in Louisiana between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3044 9148 3062 9127 3050 9085 3008 9094
      3006 9096 3008 9100 3007 9104 3017 9147
      3020 9149 3023 9148 3024 9157 3032 9159
TIME...MOT...LOC 1348Z 283DEG 38KT 3029 9116 

HAIL...0.75IN
WIND...60MPH
 
$$

LN
014 
WWUS54 KLIX 101422
SVSLIX

Severe Weather Statement
National Weather Service New Orleans LA
922 AM CDT Mon May 10 2021

LAC005-033-047-063-121-101431-
/O.EXP.KLIX.SV.W.0098.000000T0000Z-210510T1430Z/
Ascension LA-West Baton Rouge LA-Livingston LA-Iberville LA-
East Baton Rouge LA-
922 AM CDT Mon May 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN ASCENSION...WEST BATON
ROUGE...WEST CENTRAL LIVINGSTON...IBERVILLE AND SOUTHWESTERN EAST
BATON ROUGE PARISHES WILL EXPIRE AT 930 AM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 3044 9148 3062 9127 3050 9085 3008 9094
      3006 9096 3008 9100 3007 9104 3017 9147
      3020 9149 3023 9148 3024 9157 3032 9159
TIME...MOT...LOC 1421Z 283DEG 38KT 3021 9078 

$$

MSW

The office that day

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

IssuedProductOfficeCountiesLasted
May 9, 8:48 PM CDTFlash Flood WatchLIXAssumption, East Baton Rouge, East Feliciana, Iberville, Orleans, Pointe Coupee and 9 more15 hr
May 10, 1:00 AM CDTSpecial Weather StatementLIXAscension, Livingston60 min
May 10, 1:29 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville, Saint James70 min
May 10, 1:49 AM CDTSpecial Weather StatementLIXAssumption, Saint James, Saint John the Baptist56 min
May 10, 1:54 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Saint James51 min
May 10, 2:01 AM CDTSpecial Marine WarningLIX59 min
May 10, 2:43 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles2 hr
May 10, 2:52 AM CDTSpecial Marine WarningLIX53 min
May 10, 2:57 AM CDTFlash Flood WarningLIXJefferson, Orleans, Saint Charles9 hr
May 10, 3:25 AM CDTSpecial Weather StatementLIXOrleans35 min
May 10, 3:37 AM CDTSpecial Marine WarningLIX113 min
May 10, 3:41 AM CDTTornado WarningLIXOrleans, Plaquemines, Saint Bernard18 min
May 10, 4:20 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard115 min
May 10, 5:26 AM CDTSpecial Marine WarningLIX64 min
May 10, 5:29 AM CDTSpecial Marine WarningLIX2 hr
May 10, 5:38 AM CDTSpecial Weather StatementLIXWest Baton Rouge67 min
May 10, 6:04 AM CDTSpecial Weather StatementLIXEast Baton Rouge, West Baton Rouge56 min
May 10, 6:16 AM CDTSpecial Weather StatementLIXSaint Charles44 min
May 10, 6:36 AM CDTSpecial Marine WarningLIX54 min
May 10, 7:25 AM CDTSpecial Weather StatementLIXSaint John the Baptist50 min
May 10, 7:34 AM CDTSpecial Marine WarningLIX56 min
May 10, 7:51 AM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge54 min
May 10, 8:23 AM CDTSpecial Marine WarningLIX67 min
May 10, 9:16 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James and 2 more44 min
May 10, 9:38 AM CDTTornado WarningLIXAscension, Livingston, Saint James, Saint John the Baptist20 min
May 10, 9:57 AM CDTSpecial Weather StatementLIXAssumption, Orleans, Saint Charles, Saint James, Saint John the Baptist, Saint Tammany63 min
May 10, 10:29 AM CDTSpecial Marine WarningLIX61 min
May 10, 11:08 AM CDTSpecial Weather StatementLIXOrleans52 min
May 10, 11:17 AM CDTSpecial Marine WarningLIX58 min
May 10, 12:10 PM CDTSpecial Marine WarningLIX65 min
May 10, 12:14 PM CDTSpecial Marine WarningLIX91 min
May 10, 1:08 PM CDTSpecial Marine WarningLIX67 min
May 10, 1:44 PM CDTSpecial Marine WarningLIX28 min
May 10, 2:09 PM CDTSpecial Marine WarningLIX66 min
May 10, 3:09 PM CDTSpecial Marine WarningLIX96 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.