A typical summertime pattern was in place across the region, with intense daytime heating and abundant low-level moisture leading to the development of numerous afternoon thunderstorms. The storms were primarily outflow-driven and at times altered by sea breeze boundaries, and often producing locally strong and gusty winds.
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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.
A typical summertime pattern was in place across the region, with intense daytime heating and abundant low-level moisture leading to the development of numerous afternoon thunderstorms. The storms were primarily outflow-driven and at times altered by sea breeze boundaries, and often producing locally strong and gusty winds. One storm near Mandeville reached severe limits, knocking down trees and powerlines.
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 17, 5:39 PM CST, 31 minutes earlier.
Area Forecast Discussion National Weather Service New Orleans LA 639 PM CDT Sun Aug 17 2025 ...New AVIATION... .SHORT TERM... (This afternoon through Monday night) Issued at 1206 PM CDT Sun Aug 17 2025 The local area will remain under the influence of a gradually retreating upper high. With the eastern extent of the high still resulting in weak subsidence aloft, expect slightly below normal rain chances with a delayed onset in convection until the mid to late afternoon. Convective coverage should generally fall into the isolated to widely scattered range today and tomorrow. The delayed convective onset and lower coverage will allow afternoon temperatures to rise into the mid to upper 90s, or roughly 3-6 degrees warmer than normal for this time of year. Dewpoints are generally forecast in the mid 70s, which currently keeps maximum heat index values in the 105-108 degree range both today and tomorrow, which is just shy of advisory criteria. Could still see some localized areas reach criteria for an hour or two, but confidence is low enough to preclude issuance of an advisory at this time. && .LONG TERM... (Tuesday through Saturday) Issued at 1206 PM CDT Sun Aug 17 2025 The upper ridge will continue to exert influence on the local weather through midweek with only isolated to scattered showers and storms and above normal temperatures. By later in the week a more amplified pattern will take shape as hurricane Erin recurves over the western Atlantic in response to a trough over New England. By this point, the upper high will have retreated farther west and should be centered over the four corners area, placing the local area under a general weakness in the upper pattern. The aforementioned trough will also force a weak front toward the coast. Moisture pooling ahead of the front combined with the overall weakness aloft should result in an increase in convective coverage to end the week. Rain chances could be highest on Friday and Saturday depending on where exactly the front stalls. If the front stalls north of the local area, expect convective coverage to remain generally in the scattered category. However, if the front does make it into the local area, to near the coast, convective coverage would be more in the numerous to widespread category. && .AVIATION... (00Z TAFS) Issued at 634 PM CDT Sun Aug 17 2025 Scattered thunderstorm activity continues develop along weak outflow boundaries this evening as temperatures remain in the lower 90s and instability persists. The largest cluster of thunderstorms is currently near HDC and ASD where PROB30 wording through around 4z is in place. Gusty winds, occasional lightning strikes, and MVFR visibilities are the primary concern if a storm directly impacts one of these terminals. There are also some more widely scattered thunderstorm cells near GPT, NEW, and MSY that could further develop over the next 1 to 2 hours. Short term PROB30 groups were added to reflect this risk, but the overall threat is lower than for ASD and HDC. Once the convection dies out later this evening, prevailing VFR conditions will be the rule at all of the terminals through mid-day. However, another round of widely scattered storms could form generally after 18z as temperatures climb back into the mid to upper 90s. This convective threat for the afternoon hours is reflected by additional PROB30 wording at most of the terminals. PG && .AVIATION... (18Z TAFS) Issued at 1206 PM CDT Sun Aug 17 2025 VFR conditions will prevail through the period. With only isolated to widely scattered showers and storms in the forecast, confidence in any storms directly affecting a specific terminal are low and have opted to keep any mention of thunder out of the TAFs at this time. Any impacts will need to be handled by short term amendments. Winds will remain less than 10 knots and will range from northwest to northeast outside of any land/sea/lake breeze activity. && .MARINE... Issued at 1206 PM CDT Sun Aug 17 2025 No significant marine concerns aside from isolated to scattered showers and storms each day through midweek, becoming more numerous late in the week. Expect to see a fairly typical diurnal convective cycle with storms developing over the Gulf waters during the late night and and early morning hours, and transitioning farther inland by afternoon. Showers and thunderstorms will become more numerous late in the week as a weak frontal boundary stalls just north of the area. Winds will remain light at 10 knots or less with waves/seas 2 feet or less outside of thunderstorms. && .PRELIMINARY POINT TEMPS/POPS... MCB 73 95 73 96 / 20 30 10 20 BTR 75 97 75 97 / 20 40 10 30 ASD 73 94 73 95 / 30 30 10 30 MSY 80 96 79 96 / 30 30 10 30 GPT 75 94 75 94 / 20 20 10 20 PQL 73 94 73 94 / 10 30 10 30 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && SHORT TERM...DM LONG TERM....DM AVIATION...PG MARINE...DM
Special Weather Statement
National Weather Service New Orleans LA
511 PM CDT Sun Aug 17 2025
LAZ034>036-046>048-172245-
Iberville LA-East Feliciana LA-Pointe Coupee LA-West Baton Rouge LA-
East Baton Rouge LA-West Feliciana LA-
511 PM CDT Sun Aug 17 2025
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF WEST BATON ROUGE,
SOUTHEASTERN WEST FELICIANA, SOUTHEASTERN POINTE COUPEE, SOUTHWESTERN
EAST FELICIANA, NORTHWESTERN IBERVILLE AND WESTERN EAST BATON ROUGE
PARISHES THROUGH 545 PM CDT...
At 510 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms 8 miles west of Zachary, moving southwest at 15 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Baton Rouge, Zachary, Baker, Plaquemine, Port Allen, New Roads,
Jackson, St. Francisville, Addis, Brusly, Maringouin, Slaughter,
Rosedale, Grosse Tete, Erwinville, and Ramah.
This includes Interstate 10 in Louisiana between mile markers 130 and
154.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3089 9138 3085 9111 3026 9124 3036 9160
TIME...MOT...LOC 2210Z 026DEG 14KT 3064 9130
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
BLSpecial Weather Statement
National Weather Service New Orleans LA
546 PM CDT Sun Aug 17 2025
LAZ046-047-172315-
Iberville LA-West Baton Rouge LA-
546 PM CDT Sun Aug 17 2025
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF SOUTHWESTERN WEST
BATON ROUGE AND WESTERN IBERVILLE PARISHES THROUGH 615 PM CDT...
At 546 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ramah, or 15 miles northeast of Catahoula, moving south at 35 mph.
HAZARD...Winds in excess of 40 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...
Rosedale, Grosse Tete, and Ramah.
This includes Interstate 10 in Louisiana between mile markers 128 and
143.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3038 9163 3042 9164 3048 9160 3044 9137
3010 9143 3010 9146 3019 9147 3020 9149
3023 9148 3024 9157 3032 9163 3035 9163
3036 9164
TIME...MOT...LOC 2246Z 021DEG 30KT 3035 9151
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
BLSpecial Weather Statement
National Weather Service New Orleans LA
645 PM CDT Sun Aug 17 2025
LAZ076-079-080-180015-
Southeast St. Tammany LA-Northern St. Tammany LA-
Southwestern St. Tammany LA-
645 PM CDT Sun Aug 17 2025
...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF CENTRAL ST. TAMMANY
PARISH THROUGH 715 PM CDT...
At 644 PM CDT, Doppler radar was tracking a strong thunderstorm near
Abita Springs, or 11 miles east of Covington, moving southwest at 25
mph.
HAZARD...Winds in excess of 40 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...
Slidell, Covington, Abita Springs, Madisonville, Lacombe, and Slidell
Airport.
This includes the following Interstates...
Interstate 10 in Louisiana near mile marker 260.
Interstate 12 between mile markers 60 and 82.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3060 8997 3051 8978 3019 8979 3039 9020
TIME...MOT...LOC 2344Z 028DEG 20KT 3049 8992
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
BLThe Hammond radar (KHDC), 31 km away, was scanning. The volume nearest the first event began at 00:11 UTC.
1 thunderstorm wind. Local standard time, as filed.
Public call of limbs up to 2 inches broken along with power outages in the Woodridge neighborhood in Mandeville.
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: 1292996.