Sea-breeze and lake-breeze boundaries, along with favorable instability, triggered thunderstorm development during the late morning and afternoon timeframe. These storms produced strong winds across the waters during that timeframe.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LIX wrote it up.
Sea-breeze and lake-breeze boundaries, along with favorable instability, triggered thunderstorm development during the late morning and afternoon timeframe. These storms produced strong winds across the waters during that timeframe. These storms were also slow-moving, so urban areas saw some flash flooding during the morning. With no wind shear, these storms dissipated a couple hours later.
The local office's own words before the first event, 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 the first event at May 29, 1:39 PM CST, 21 hours 11 minutes earlier.
Area Forecast Discussion National Weather Service New Orleans LA 239 PM CDT Wed May 29 2024 ...New SHORT TERM, LONG TERM, AVIATION, MARINE... .SHORT TERM... (This evening through Friday night) Issued at 207 PM CDT Wed May 29 2024 A series of fast moving and weak southern stream shortwave troughs embedded within a largely zonal flow regime aloft will slide through the Lower Mississippi Valley over the course of the short term period. As these shortwave features move through the area, the increased forcing aloft will support the development of convective activity each afternoon. The convection is expected to initially develop over east Texas and western Louisiana in the late morning and early afternoon hours and then follow the theta e axis to the east or southeast into the forecast area by the late afternoon and early evening hours each day. Given this risk, have included chance PoP values of 30 to 40 percent in the forecast generally between 21z and 03z on Thursday and Friday. Fortunately, the risk of severe storms remains low with the convection due to a lack of substantial wind shear. However, a few wet microbursts producing locally strong wind gusts could occur if drier air in the mid-levels becomes entrained into the updraft of any deeper convective cells. Overall, the convective threat will be highly diurnal with mainly dry conditions expected from late evening through early afternoon each day. Temperatures will be near to slightly above average through the period with highs in the upper 80s and lower 90s and lows ranging from the upper 60s to the mid 70s. Overall, have stuck with the NBM deterministic output for temperatures. We are very much in an early Summer regime at this point. && .LONG TERM... (Saturday through Tuesday night) Issued at 207 PM CDT Wed May 29 2024 The area will continue to have daily slight chances of showers and storms as some weak disturbances ride to our north as an upper level ridge builds up from Mexico. So overall we are entering into summertime pattern with daily diurnally driven convection. Overall not expecting any severe thunderstorms but Friday is outlooked as marginal by SPC. There is plenty of CAPE and moisture for storms to tap into , but failure modes could be weak shear and lapse rates. Temperatures will have a slow warming trend with highs in the low 90s. There will still be ample moisture being pumped into the area thanks to onshore flow, so we could see heat indices tickle around 100 F. As of right now it's not looking like the heat we had last weekend/early this week. -BL && .AVIATION... (18Z TAFS) Issued at 207 PM CDT Wed May 29 2024 The primary forecast concern through the evening hours will be the potential for convective impacts at MCB. A complex of showers and thunderstorms is currently moving through central Louisiana, and if this area of storms holds together could impact MCB between 22z and 02z. Have included prevailing SHRA and TEMPO group with thunderstorms for this time period. Elsewhere, the risk of convective development is too low to include in the forecast at this time. Going into tomorrow morning, most areas will remain VFR, but if evening rains do impact MCB, a period of IFR ceilings and visibilities could develop between 10z and 13z due to the wet soils. By 14z, all of the terminals will see VFR conditions return as the boundary layer fully mixes out. && .MARINE... Issued at 207 PM CDT Wed May 29 2024 A Summer regime will be in full effect through early next week across the coastal waters. Prevailing south and southeast winds of 10 to 15 knots and seas of 1 to 3 feet can be expected through the entire period as a broad surface high pressure systems remains centered to the east of the region. There will be a threat of some thunderstorm activity moving offshore from land each afternoon and evening, and these storms could produce gusty winds and lightning, but the impacts will be short- lived. && .PRELIMINARY POINT TEMPS/POPS... MCB 66 88 67 88 / 40 40 20 30 BTR 70 89 71 89 / 30 40 20 40 ASD 70 90 71 89 / 30 20 10 20 MSY 75 89 75 88 / 20 20 10 30 GPT 73 89 74 87 / 20 10 10 20 PQL 71 89 71 88 / 20 10 10 20 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && SHORT TERM...PG LONG TERM....BL AVIATION...PG MARINE...PG
The Hammond radar (KHDC), 73 km away, was scanning. The volume nearest the first event began at 16:46 UTC.
1 flash flood. Local standard time, as filed.
Video of several inches of standing water near the intersection of St. Joseph St and Convention Center Blvd via social media.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2024Every state in 2024This day in weather historyWarnings in Louisiana, May 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 1185994.