Alert archive / Louisiana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 18, NWS New Orleans, LA

April 4, 20198 parishes in Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Apr 4, 2019, 10:44 AM CDT for 8 parishes in Louisiana. It was in force for 46 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 4, 2019, 10:44 AM CDT (15:44 UTC)
Expired
Apr 4, 2019, 11:30 AM CDT
In force
46 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Ascension Parish, LA, Assumption Parish, LA, Iberville Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Terrebonne Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 3.7 hours before the alert went out and 112 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 2019-04-04Temperature 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°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 2019-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 220 square meters per square second.19395878Sfc1 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
941 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
220 m²/s²
0-3 km storm-relative helicity
236 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 5:11 AM CDTSpecial Weather StatementLIXSaint James64 min
Apr 4, 5:51 AM CDTSevere Thunderstorm WarningLIXIberville24 min
Apr 4, 6:49 AM CDTSpecial Marine WarningLIX41 min
Apr 4, 7:04 AM CDTSpecial Weather StatementLIXLivingston26 min
Apr 4, 7:10 AM CDTSpecial Weather StatementLIXSaint Charles35 min
Apr 4, 7:21 AM CDTSpecial Weather StatementLIXOrleans, Saint John the Baptist24 min
Apr 4, 8:46 AM CDTSpecial Marine WarningLIX44 min
Apr 4, 8:51 AM CDTSpecial Marine WarningLIX54 min
Apr 4, 9:37 AM CDTSpecial Marine WarningLIX53 min
Apr 4, 10:04 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Iberville, Saint James41 min
Apr 4, 10:46 AM CDTAreal Flood AdvisoryLIXAscension, East Baton Rouge, Iberville, Livingston, Saint James, Saint John the Baptist and 1 more3 hr
Apr 4, 11:18 AM CDTFlood WatchLIXAssumption, East Baton Rouge, Iberville, Saint Bernard, Saint James, Saint John the Baptist and 1 more10 hr
Apr 4, 11:31 AM CDTSpecial Weather StatementLIXSaint James, Saint John the Baptist44 min
Apr 4, 11:45 AM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Saint Charles, Saint John the Baptist3 hr
Apr 4, 12:08 PM CDTSpecial Weather StatementLIXSaint Charles37 min
Apr 4, 12:16 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Saint Charles29 min
Apr 4, 12:20 PM CDTAreal Flood AdvisoryLIXAssumption, Jefferson, Lafourche, Saint Charles, Saint James, Saint John the Baptist and 1 more3 hr
Apr 4, 12:42 PM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Plaquemines, Saint Bernard, Saint Charles33 min
Apr 4, 1:10 PM CDTSpecial Marine WarningLIX35 min
Apr 4, 1:14 PM CDTSpecial Weather StatementLIXJefferson46 min
Apr 4, 1:35 PM CDTSpecial Marine WarningLIX40 min
Apr 4, 1:39 PM CDTSpecial Marine WarningLIX51 min
Apr 4, 2:18 PM CDTSpecial Marine WarningLIX57 min
Apr 4, 2:33 PM CDTSpecial Marine WarningLIX57 min
Apr 4, 3:12 PM CDTSpecial Weather StatementLIXPointe Coupee, West Feliciana48 min
Apr 4, 3:19 PM CDTSpecial Marine WarningLIX26 min
Apr 4, 3:34 PM CDTSpecial Marine WarningLIX56 min
Apr 4, 3:56 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena, West Feliciana34 min
Apr 4, 5:49 PM CDTSpecial Weather StatementLIXAmite, Pike, Walthall41 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2019Every severe thunderstorm warning in 2019

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.