Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 252, NWS New Orleans, LA

September 7, 2023Lafourche Parish, Terrebonne Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Sep 7, 2023, 7:20 PM CDT for Lafourche Parish, Terrebonne Parish, Louisiana. It was in force for 25 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
Sep 7, 2023, 7:20 PM CDT (00:20 UTC)
Expired
Sep 7, 2023, 7:45 PM CDT
In force
25 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Lafourche Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.3 hours before the alert went out and 128 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 00:00Z on 2023-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 282 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 00:00Z on 2023-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -90 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
282 J/kg
Mixed-layer CIN
-218 J/kg
Mixed-layer LCL
1751 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-90 m²/s²
0-3 km storm-relative helicity
-26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 7:08 PM CDTSpecial Marine WarningLIX60 min
Sep 7, 7:50 PM CDTSpecial Weather StatementLIXIberville, West Baton Rouge40 min
Sep 8, 12:08 PM CDTSpecial Weather StatementLIXEast Feliciana, Pointe Coupee, West Feliciana52 min
Sep 8, 12:42 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena, West Feliciana48 min
Sep 8, 1:25 PM CDTSevere Thunderstorm WarningLIXIberville, Pointe Coupee, West Baton Rouge50 min
Sep 8, 1:28 PM CDTSpecial Weather StatementLIXAscension, East Baton Rouge, East Feliciana, Livingston, Saint Helena47 min
Sep 8, 1:53 PM CDTSevere Thunderstorm WarningLIXAscension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 1 more52 min
Sep 8, 2:12 PM CDTSevere Thunderstorm WarningLIXAssumption, Iberville48 min
Sep 8, 2:39 PM CDTSpecial Weather StatementLIXAssumption21 min
Sep 8, 3:00 PM CDTSpecial Weather StatementLIXAssumption, Saint James30 min
Sep 8, 3:21 PM CDTSpecial Marine WarningLIX54 min
Sep 8, 4:15 PM CDTSpecial Marine WarningLIX60 min
Sep 8, 5:17 PM CDTSpecial Marine WarningLIX58 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.