Persistent low-level moisture and weak convergence along a frontal boundary that had been stalled over the local area for days once again supported the development of scattered showers and thunderstorms. Model soundings indicated a dry slot aloft along the northern periphery of much more moisture to the south.
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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.
Persistent low-level moisture and weak convergence along a frontal boundary that had been stalled over the local area for days once again supported the development of scattered showers and thunderstorms. Model soundings indicated a dry slot aloft along the northern periphery of much more moisture to the south. It was here that a storm was able to capitalize on that setup and produce a severe downburst of winds.
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 Aug 6, 1:11 PM CST, 1 hour 14 minutes earlier.
Area Forecast Discussion National Weather Service New Orleans LA 211 PM CDT Wed Aug 6 2025 ...New SHORT TERM, LONG TERM, MARINE... .SHORT TERM... (This evening through Thursday night) Issued at 1245 PM CDT Wed Aug 6 2025 We are in a fairly stagnant upper level weather pattern with high pressure over the Four Corners, a very weak trough extending from the Great Lakes into the northcentral Gulf, and the Bermuda high extending into the eastern Gulf. All of this is combining to produce a weak, relatively stationary front along the the coast, drifting north and south through our area. Over the next 36 to 48 hours these features, plus some sea/lake breeze boundaries are providing a focus for afternoon thunderstorms. Note that some of these storms could produce enough rain to cause some localized flash flooding. The rain will balance with partly cloudy skies to give us fairly normal high temperatures this afternoon and tomorrow in the low 90s. Winds will tend toward calm and variable, except in the area of thunderstorms where they will be gusty and vary in direction. && .LONG TERM... (Friday through Tuesday night) Issued at 1245 PM CDT Wed Aug 6 2025 Beyond the short term, the upper level pattern will stay about the same as it is now, except the trough and frontal boundary will wash out into the weekend, but a weakness between the two high pressure domes will remain in place and still provide a driver for thunderstorm growth. The daytime highs, though, will remain about the same as we are currently seeing. && .AVIATION... (18Z TAFS) Issued at 1124 AM CDT Wed Aug 6 2025 Current conditions are VFR. Afternoon convection is beginning along coastal areas, particularly HUM, and is expected to continue filling across the area. TS activity may temporarily degrade conditions at a given terminal and cause variable/gusty winds and has been handled with PROB30 coding. && .MARINE... Issued at 1245 PM CDT Wed Aug 6 2025 Main concern for marine operations will once again be the threat of thunderstorms, with the higher probabilities being in the offshore waters during the overnight hours. If there's going to be a day/night with the least activity it will probably be Friday. Outside of convective impacts, wind/wave conditions will remain benign across the coastal waters. A few strong storms will be possible each day/night, and would result in gusty winds, waterspouts, and locally higher waves/seas. The threat for waterspouts will be highest during the morning hours, especially when they can anchor near boundary intersections such as frontal boundaries, lake and sea breeze boundaries. && .PRELIMINARY POINT TEMPS/POPS... MCB 71 91 71 92 / 20 30 0 30 BTR 73 92 74 93 / 20 50 10 40 ASD 72 91 71 91 / 20 50 20 50 MSY 78 92 78 92 / 20 50 20 60 GPT 74 91 73 90 / 20 50 20 50 PQL 73 91 72 91 / 30 50 30 50 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && SHORT TERM...DS LONG TERM....RW AVIATION...DS MARINE...DS/KG
The Hammond radar (KHDC), 28 km away, was scanning. The volume nearest the first event began at 20:22 UTC.
1 thunderstorm wind. Local standard time, as filed.
Public reported trees down near Sams Club and Rooms 2 Go in Covington.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2025Every state in 2025This day in weather historyWarnings in Louisiana, August 2025
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 2026-09-24. Each event’s entry at NCEI: 1292991.