A stalled boundary over the area caused thunderstorm development during the early morning hours. The storms trained along the boundary over Hammond, an urbanized area.
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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 stalled boundary over the area caused thunderstorm development during the early morning hours. The storms trained along the boundary over Hammond, an urbanized area. The very moist environment led to efficient rainfall over that area, which caused isolated flash flooding. The boundary eventually surged southward, taking the rain with it while causing the flooding to stop in Hammond.
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Flash Flooding was beginning to occur in Hammond near I-12 and I-55 with water completely covering some residential roads and yards.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2023Every state in 2023This day in weather historyWarnings in Louisiana, September 2023
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 2026-10-01. Each event’s entry at NCEI: 1142843.