Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 56, NWS New Orleans, LA

April 15, 20236 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 15, 2023, 10:41 AM CDT for 6 parishes in Louisiana. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 15, 2023, 10:41 AM CDT (15:41 UTC)
Expired
Apr 15, 2023, 11:45 AM CDT
In force
64 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberville Parish, LA, Pointe Coupee Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.7 hours before the alert went out and 159 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 2023-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 529 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 2023-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 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
529 J/kg
Mixed-layer CIN
-323 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
214 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 15, 6:49 AM CDT, 3 hours 52 minutes earlier.

Area forecast discussion, Apr 15, 6:49 AM CDT, 3 hours 52 minutes before
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In the hours before

Special weather statement, Apr 15, 10:04 AM CDT, 37 minutes before
Special Weather Statement
National Weather Service New Orleans LA
1004 AM CDT Sat Apr 15 2023

LAZ034>036-MSZ068-069-151600-
East Feliciana LA-Pointe Coupee LA-West Feliciana LA-Wilkinson MS-
Amite MS-
1004 AM CDT Sat Apr 15 2023

...A strong thunderstorm will impact portions of West Feliciana,
northwestern Pointe Coupee and northwestern East Feliciana Parishes,
Wilkinson and western Amite Counties through 1100 AM CDT...

At 1004 AM CDT, Doppler radar was tracking a strong thunderstorm near
Simmesport, moving northeast at 35 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Jackson, St. Francisville, Liberty, Centreville, Woodville, Gloster,
Morganza, Wilson, Norwood, Wakefield, Spillman, Batchelor,
Lettsworth, Fort Adams, Dolorosa and Crosby.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3132 9112 3135 9102 3135 9083 3105 9079
      3061 9175 3071 9173 3086 9182 3087 9180
      3097 9181 3104 9172 3104 9165 3097 9166
      3104 9156 3114 9163 3124 9156 3122 9151
      3124 9148 3128 9149 3132 9146 3137 9123
TIME...MOT...LOC 1504Z 235DEG 29KT 3095 9177

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

MEFFER
Special weather statement, Apr 15, 10:27 AM CDT, 14 minutes before
Special Weather Statement
National Weather Service New Orleans LA
1027 AM CDT Sat Apr 15 2023

LAZ034>037-046>048-083-085-151615-
Iberville LA-Northern Livingston LA-St. Helena LA-East Feliciana LA-
Western Ascension LA-Pointe Coupee LA-West Baton Rouge LA-
East Baton Rouge LA-West Feliciana LA-
1027 AM CDT Sat Apr 15 2023

...A strong thunderstorm will impact portions of northwestern
Ascension, southeastern West Feliciana, West Baton Rouge,
southwestern St. Helena, southern Pointe Coupee, northwestern
Livingston, central East Feliciana, Iberville and East Baton Rouge
Parishes through 1115 AM CDT...

At 1027 AM CDT, Doppler radar was tracking a strong thunderstorm near
Lottie, or near Krotz Springs, moving northeast at 45 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Baton Rouge, Zachary, Baker, Denham Springs, Gonzales, Plaquemine,
Port Allen, New Roads, Jackson, St. Francisville, Clinton, Oak Hills
Place, St. Gabriel, Walker, Addis, Brusly, Livonia, Maringouin,
Slaughter and Fordoche.

This includes the following Interstates...
 Interstate 10 in Louisiana between mile markers 128 and 176.
 Interstate 12 between mile markers 1 and 16.
 Interstate 110 in Louisiana between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3093 9105 3076 9086 3026 9086 3011 9147
      3019 9147 3020 9149 3023 9148 3024 9157
      3026 9159 3036 9164 3038 9163 3044 9164
      3050 9173 3056 9176 3061 9176
TIME...MOT...LOC 1527Z 242DEG 41KT 3049 9166

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

MEFFER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 15, 9:39 AM CDTSpecial Marine WarningLIX96 min
Apr 15, 10:04 AM CDTSpecial Weather StatementLIXPointe Coupee, West Feliciana56 min
Apr 15, 10:27 AM CDTSpecial Weather StatementLIXEast Baton Rouge, East Feliciana, Iberville, West Baton Rouge48 min
Apr 15, 11:09 AM CDTSpecial Marine WarningLIX66 min
Apr 15, 11:10 AM CDTSpecial Weather StatementLIXLafourche, Terrebonne50 min
Apr 15, 11:16 AM CDTSevere Thunderstorm Warning Considerable damage threatLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena, Tangipahoa44 min
Apr 15, 11:29 AM CDTSpecial Marine WarningLIX61 min
Apr 15, 11:40 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Livingston27 min
Apr 15, 11:43 AM CDTSpecial Marine WarningLIX70 min
Apr 15, 11:57 AM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston2 hr
Apr 15, 12:00 PM CDTSpecial Weather StatementLIXTangipahoa, Washington30 min
Apr 15, 12:03 PM CDTSpecial Weather StatementLIXAscension, Assumption, Saint James57 min
Apr 15, 12:15 PM CDTSpecial Weather StatementLIXJefferson, Lafourche, Plaquemines60 min
Apr 15, 12:22 PM CDTSpecial Marine WarningLIX83 min
Apr 15, 12:31 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles, Saint James and 1 more119 min
Apr 15, 12:37 PM CDTSpecial Weather StatementLIXSaint Charles, Saint John the Baptist38 min
Apr 15, 12:45 PM CDTSpecial Weather StatementLIXSaint Tammany45 min
Apr 15, 12:51 PM CDTSpecial Marine WarningLIX54 min
Apr 15, 1:04 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles41 min
Apr 15, 1:07 PM CDTSevere Thunderstorm WarningLIXSaint Tammany38 min
Apr 15, 1:23 PM CDTSpecial Marine WarningLIX67 min
Apr 15, 1:38 PM CDTSevere Thunderstorm WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany37 min
Apr 15, 1:45 PM CDTSpecial Marine WarningLIX60 min
Apr 15, 2:21 PM CDTSpecial Marine WarningLIX24 min
Apr 15, 2:39 PM CDTSpecial Marine WarningLIX27 min
Apr 15, 2:40 PM CDTSmall Craft AdvisoryLIX40 hr
Apr 15, 5:36 PM CDTSpecial Weather StatementLIXJefferson39 min
Apr 15, 6:31 PM CDTSpecial Weather StatementLIXTerrebonne29 min
Apr 15, 11:01 AM CDTSpecial Weather StatementLIXAmite, Pike44 min
Apr 15, 11:36 AM CDTSevere Thunderstorm WarningLIXAmite, Pike, Walthall39 min
Apr 15, 12:13 PM CDTSpecial Weather StatementLIXWalthall32 min
Apr 15, 2:12 PM CDTSevere Thunderstorm WarningLIXHarrison, Jackson63 min
Apr 15, 6:04 PM CDTRiver Flood WarningLIXPearl River108 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023Every severe thunderstorm warning in 2023

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.