A frontal boundary that stalled across southeast Louisiana and southern Mississippi on September 2nd, slowly lifted northward through the day on September 3rd. Abundant moisture in place south of the boundary provided enough lift for showers and thunderstorms to develop.
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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 frontal boundary that stalled across southeast Louisiana and southern Mississippi on September 2nd, slowly lifted northward through the day on September 3rd. Abundant moisture in place south of the boundary provided enough lift for showers and thunderstorms to develop. The existence and slow movement of the front resulted in slow moving storms. This resulted in heavy rainfall and flash flooding over portions of Baton Rouge and 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 Sep 3, 5:30 AM CST, 4 hours 20 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service New Orleans LA 630 AM CDT Sat Sep 3 2022 ...New AVIATION... .SHORT TERM... (This evening through Sunday night) Issued at 349 AM CDT Sat Sep 3 2022 Some light patchy fog has developed across the fog favored portions of the northern CWFA this AM. This should dissipate rapidly after sunrise. Otherwise, modest nocturnal convection has developed across the open Gulf waters south of Terrebonne early this morning. This activity has developed along the moisture gradient. Aloft, the region remains between a developing upper level weakness over the lower Missouri River Basin and a weak H5 ridge over the Florida Peninsula. The winds through the column should become more unidirectional today, which should finally erode the mid and upper level dry layer that has protected most of us from shower and T'storm activity over the last few days. From the 00z RAOB locally, precipitable waters have jumped up just a bit (although still below climo) to around 1.70". Going into the afternoon, PWATs should continue to rebound closer to 2.2" or so, which when coupled with the active southwesterly flow and diurnal cycle should provide enough evidence for a higher POP day today. With the pattern some hydro concerns could arise, especially if storms cluster from SW to NE within the mean flow. Going into Sunday and into the new workweek, not much in the upper level or surface pattern changes. The active SWerly flow will continue with no real change in the dominant synoptic features in play. The primary challenge will likely be timing of weak mid level impulses within the SWerly flow. The max rain potential would likely occur if timing of the impulse(s) coincide with the diurnal cycle. However, even residual weak surface boundaries (i.e. outflow) could help generate "off hour" convection, if you will. Regardless, there are plenty of signals for higher-end CLIMO POPs through the period. As for temperatures, timing of convection will play a large role in afternoon temperature forecasts. True, the increase in rain/clouds will keep temperatures lower, but only if there isn't a late initiation. The thought is late morning to early afternoon, which would cap heating at or below 90F for most of us, but a slight delay could mean the difference in MaxTs remaining in the 80s vs 90s. (Frye-28) && .LONG TERM... (Tuesday through Friday night) Issued at 349 AM CDT Sat Sep 3 2022 Not a whole lot of change in thinking for the long term forecast. Next week each day will be pretty much a rinse and repeat of numerous showers and thunderstorms throughout the day, mainly during the normal diurnal cycle from the late morning through the early evening. Convection will be mainly focused along sea and lake breeze boundaries. PoPs are expected to be on the order of 70-80% each afternoon through the long term period. Deep tropical moisture will continuously flow in next week with persistent southerly flow at the surface and southwesterly flow aloft. This paired with PWs on the order of 2.0-2.2 and the already saturated soil, we may see some flash flooding issues next week. This would be mostly for urban areas and any areas that see training of storms or multiple rounds of storms in a short period of time. Rain rates could be on the order of 3-4 inches per hour in the stronger storms that develop. On a better note, higher chances of rain leads to lower temperatures. High temperatures look to be limited to the low to mid 80s later in the period. HL && .AVIATION... (12Z TAFS) Issued at 629 AM CDT Sat Sep 3 2022 Fog for MCB should dissipate shortly after sunrise. Otherwise, convection increases today. At this juncture, wasn't confident to indicate anything lower than VFR/MVFR, but short fused IFR TEMPOs may be required later this morning or into the afternoon hours. For now, continued VCs for thunder with showers prevailing for most locations this afternoon and kept some mention of showers (VCs) overnight for most terminals near the coast. MCB again may experience patchy fog overnight. Mainly light and variable winds outside of thunderstorms. && .MARINE... Issued at 349 AM CDT Sat Sep 3 2022 Generally favorable marine conditions are forecast through the weekend and into early next week. Light to moderate southerly or westerly winds are anticipated with seas generally at or below 3 ft over the open Gulf waters. Otherwise, the main concern would be increasing convection over the next few days. The strongest showers and T'storms may produce locally higher winds and seas as well as frequent cloud-to-water lightning and brief heavy rainfall. (Frye-28) && .PRELIMINARY POINT TEMPS/POPS... MCB 87 71 84 69 / 80 40 80 20 BTR 88 73 86 73 / 90 40 80 30 ASD 90 73 89 73 / 80 40 80 30 MSY 88 76 87 76 / 90 50 80 30 GPT 89 74 88 74 / 70 40 80 40 PQL 89 73 89 73 / 70 40 80 40 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && SHORT TERM...Frye-28 LONG TERM....HL AVIATION...Frye-28 MARINE...Frye-28
The national radar mosaic for the moment the first event began.
12 flash flood. Local standard time, as filed.
Received a report of a stalled car due to heavy rain and sitting water at the underpass of the Acadian Thruway underpass.
Heavy rainfall resulted in flooding at the intersection of Corporate Boulevard and Energy Drive with water approximately 1 foot deep.
Heavy rain resulted in street flooding near Webb Park. Water estimated to be around 1 foot deep. Time estimated by radar.
Heavy rain resulted in street flooding on Freret near the Fogelman Arena in Devlin Fieldhouse. Water estimated to be around 1 foot deep.
Heavy rain resulted in street flooding near the intersection of Magazine and Napoleon Avenue. Water estimated to be around 1 foot deep.
Heavy rain resulted in street flooding near the intersection of Willow and Calhoun. Water estimated to be around 1.5 feet deep.
Heavy rain resulted in flooding around 1.5 feet deep near Napoleon and Camp. Time estimated by radar.
Heavy rain resulted in flooding around 1 foot deep near Chippewa and Felicity streets. Time estimated by radar.
Heavy rain resulted in flooding around 1 foot deep near the intersection of Washington and Annunciation Streets. Time estimated by radar.
Heavy rain resulted in flooding around 1 foot deep along General Pershing. Time estimated by radar.
Heavy rain resulted in flooding around 1 foot deep near the intersection of Dante and Oak Streets. Time estimated by radar.
Broadcast media reported several impassable streets throughout Tulane University due to flooded streets.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2022Every state in 2022This day in weather historyWarnings in Louisiana, September 2022
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: 1057928, 1057929, 1057930, 1057931, 1057932, 1057933, 1057934, 1057935, 1057937, 1057945, 1057948, 1057949.