While the remnants of Hurricane Laura moved well north of the local area, feeder bands continued to produce bands of training thunderstorms in southeast Louisiana.
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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.
While the remnants of Hurricane Laura moved well north of the local area, feeder bands continued to produce bands of training thunderstorms in southeast Louisiana.
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 28, 2:35 PM CST, 3 hours 4 minutes earlier.
Area Forecast Discussion
National Weather Service New Orleans LA
335 PM CDT Fri Aug 28 2020
.SHORT TERM...
Lower Mississippi River Valley region is under the influence of wake
trough aligning with upper level trough axis to maintain a focus for
convection that has persisted since the early morning from southwest
Louisiana, through the Atchafalaya Basin into southern Mississippi.
These efficient rain-makers have been maintaining decent motions to
preclude any flood threat thusfar, though rain rates have been
predominantly in the 1-2"/hr range on cell motions now increased to
around 25 kt. Much of this convection will wane or narrow in extent
after sunset, dissipating by midnight over the forecast area. GFS
shows some enhancement of moisture on an axis oriented on the west
flank of the building Bermuda ridge that lurks off the coast heading
into Saturday. This moisture source will likely fuel the afternoon
gulf breeze. In all appearances, the land/gulf breeze regime should
be the main weather driver Saturday through Monday, enhanced a bit
in integrity due to the tropical fetched moisture on the periphery
of Bermuda ridge. Temperatures wil likely be tamped due to increase
moisture content, generally in the mid to upper 80s before any rain
cooling takes place. Lows overnight in the humid mid to upper 70s
range each night.
.LONG TERM...
(Tuesday through Friday) Models suggest ridge spline of Bermuda
ridge becomes established along the coast to impart larger scale
subsidence that will suppress daily convection. There should be a
stretch of relatively dry days will only isolated late afternoon
convection on what should be a less pronounced gulf breeze through
Thursday. A weak frontal zone settles into the Lower MS Valley
late Thursday into Friday that brings a focus/triggering mechanism
for storms, some of which may be strong to marginally severe next
Friday as surge of continental high pressure pushes the front
into the near coastal waters Friday evening. GFS is notorious for
showing frontal passage in the extended ranges that don't quite
have the punch upon arrival. Not jumping too hard on the front
being as strong as indicated, but should be enough to bring
increased instability/frontal forcing for the convective aspects,
maybe some subtle effects on temperatures heading into next
weekend.
&&
.AVIATION...
VFR conditions expected outside of convection, which should be
trending towards less coverage around sunset, then clearing prior to
midnight. Some localized impacts may carry over after 00Z at KASD,
KGPT, KNEW but likely to dissipate by 02-03Z. Guidance indicates 3SM
BR at KMCB, and given ambient moisture around the area, can not
discount some formation towards daybreak, as handled with TEMPO
group.
&&
.MARINE...
General S-SW winds expected to prevail on the periphery of Bermuda
ridge extension into the central gulf. There appears to be some
convective enhancement to the winds Saturday that brings SW winds to
moderate levels in the outer waters but settle out in the evening.
Thereafter, general light winds and low seas through Tuesday.
&&
.DECISION SUPPORT...
Code: Blue
Activities: Critical DSS site support
Storm recovery support
&&
.PRELIMINARY POINT TEMPS/POPS...
MCB 75 89 75 89 / 10 20 10 60
BTR 76 92 76 90 / 10 20 10 70
ASD 75 91 75 90 / 10 30 20 80
MSY 77 90 77 90 / 10 30 20 80
GPT 77 88 76 88 / 20 30 30 70
PQL 76 90 75 90 / 20 30 30 70
&&
.LIX WATCHES/WARNINGS/ADVISORIES...
LA...None.
GM...None.
MS...None.
GM...None.
&&
24/RRThe national radar mosaic for the moment the first event began.
3 flash flood. Local standard time, as filed.
Emergency manager reported homes in River Ridge taking on water.
A business in River Ridge flooded.
The emergency manager reported feet of water in Waggaman.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2020Every state in 2020This day in weather historyWarnings in Louisiana, August 2020
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: 916074, 916075, 916076.