An upper level centered over Texas began driving moisture into the local area a couple days prior to this event. By the 30th, the atmospheric moisture content had reached values near the record for this time of year.
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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.
An upper level centered over Texas began driving moisture into the local area a couple days prior to this event. By the 30th, the atmospheric moisture content had reached values near the record for this time of year. Storms that developed in this environment were able to tap into this moisture to produce quite heavy rainfall and when combined with slow storm movement, produced flash flooding over New Orleans.
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 30, 3:15 AM CST, 6 hours 10 minutes earlier.
Area Forecast Discussion
National Weather Service New Orleans LA
415 AM CDT Fri Aug 30 2024
...New SHORT TERM, LONG TERM, AVIATION, MARINE...
.SHORT TERM...
(Today through Saturday)
Issued at 335 AM CDT Fri Aug 30 2024
The cycle will continue today and again Saturday. The start is
wherever we would like it to be, so we will start with each evening.
This is when things become most stable as heating has been taken
away and since heating is the main forcing here, that causes things
to decay. The marine environment is still stable by this time as
well so most activity will basically either be in decay or not
present. Basically, this is where the convective day starts over.
The marine environment then starts to become unstable as the air
cools and the nocturnals start up, then land heats up and inland
storms take over. This will be the issue each day and since the PW
values are 2+", all these storms will have the potential for very
heavy rainfall over a short time. With any training situation this
issue becomes more concerning. Eventhough we have needed the rain
for a while, it is normally feast or famine and at the moment we are
entering the feast mode.
&&
.LONG TERM...
(Saturday night through Thursday)
Issued at 335 AM CDT Fri Aug 30 2024
This diurnal dance in storm development will occur each day through
the weekend into most if not all of next week. Some days with
slightly less chances of storms while others will be more robust.
The upper level trough moving southeast will stall over the central
part of the country keeping this interaction between it and the
upper maritime ridge active. There is some indication that a
reinforcing short wave deepening this upper trough farther into the
south could occur by next week's end. We shouuld see this feature
move into the SW coast of Canada by Monday evening. If it does as
advertised, it could bring a front to or through the area by
next weekend.
&&
.AVIATION...
(12Z TAFS)
Issued at 335 AM CDT Fri Aug 30 2024
All terminals VFR to possibly some MVFR cigs by afternoon. This
could be due mainly to TSRA causing temporary restrictions with vis
and cigs. This should start during the morning hours for coastal
sites and inland sites during the daylight hours. Will time these in
12z taf pack.
&&
.MARINE...
Issued at 335 AM CDT Fri Aug 30 2024
Not much difference in winds over the north central gulf into next
week. Wind direction should remain stable from the SE and speeds
should also hold at and around 10kt. There will be plenty of sh/ts
that develop over the coming several days that will cause very
localized strong winds from different directions at times. Storms
will mainly develop in the early morning and some of these could
continue well into the daylight hours.
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 85 72 85 70 / 80 30 80 20
BTR 87 75 87 75 / 90 50 90 30
ASD 87 74 87 73 / 80 60 80 40
MSY 86 75 85 75 / 90 60 90 40
GPT 87 75 87 75 / 90 50 80 30
PQL 92 75 92 75 / 80 50 70 30
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...Flood Watch through this evening for LAZ046>048-056>060-064>070-
076>090.
GM...None.
MS...Flood Watch through this evening for MSZ083>088.
GM...None.
&&
SHORT TERM...TE
LONG TERM....TE
AVIATION...TE
MARINE...TESpecial Weather Statement
National Weather Service New Orleans LA
436 AM CDT Fri Aug 30 2024
LAZ066-301000-
Lower Terrebonne LA-
436 AM CDT Fri Aug 30 2024
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CENTRAL TERREBONNE
PARISH THROUGH 500 AM CDT
...
At 435 AM CDT, Doppler radar was tracking a cluster of strong
thunderstorms capable of producing waterspouts over marine areas
along a line extending from 19 miles south of Amelia to 11 miles west
of Cocodrie. Movement was north at 25 mph.
HAZARD...Waterspouts and winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Waterspouts can easily overturn boats and create locally
hazardous waters. Gusty winds could knock down tree limbs
and blow around unsecured objects.
Locations impacted include...
Dulac.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If on or near marine areas, get out of the water and move indoors or
inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.
&&
LAT...LON 2932 9124 2937 9126 2937 9123 2931 9120
2933 9116 2930 9116 2933 9113 2937 9120
2943 9121 2945 9126 2954 9127 2960 9119
2959 9116 2962 9110 2946 9076 2910 9066
2909 9073
TIME...MOT...LOC 0935Z 160DEG 23KT 2938 9114 2919 9085
WATERSPOUT...POSSIBLE
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
TJSPreliminary Local Storm Report
National Weather Service New Orleans LA
934 AM CDT Fri Aug 30 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0925 AM Flash Flood 3 NW New Orleans 30.01N 90.11W
08/30/2024 Orleans LA Public
Social media video of several inches of
water covering West End Blvd in New Orleans.
&&
KLGPreliminary Local Storm Report
National Weather Service New Orleans LA
945 AM CDT Fri Aug 30 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0944 AM Flash Flood 4 ENE Metairie 30.02N 90.12W
08/30/2024 Jefferson LA Public
Social media video of ankle-deep water along
Lake Avenue in Bucktown.
&&
KLGThe Hammond radar (KHDC), 63 km away, was scanning. The volume nearest the first event began at 15:23 UTC.
2 flash flood. Local standard time, as filed.
Social media video showed impassable roads across Lakeview, just west of City Park.
A social media video showed water over a foot deep along Lake Avenue in Bucktown.
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, August 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 2026-09-24. Each event’s entry at NCEI: 1213323, 1213324.