123
Recorded events
0
Direct deaths
0
Direct injuries
$10.8M
Property damage
Flash Flood in St. Tammany Parish, Louisiana: 123 recorded events between 1998 and 2024. The strongest on record measured 0. That places the county #114 nationally and #4 statewide for this hazard.
Decade by decade
Flash Flood in St. Tammany Parish, Louisiana: events per decade
Reporting practice changed over time — early decades are undercounted, not calmer.
The busiest decade for flash flood in St. Tammany Parish is the 2020s, when 78 of the county's 123 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.
Within the St. Tammany Parish archive, flash flood makes up 17.2% of all recorded severe weather across 8 hazard types. Nationally the county sits at #114 for this hazard and #4 within Louisiana, putting it in the 96.4 percentile of all U.S. counties.
Seasonality
Events by month
Jul is the peak month for flash flood in St. Tammany Parish with 21 recorded events, while Feb is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.
Most recent
Latest recorded events
| Date | Location | Magnitude | Damage |
|---|---|---|---|
| Dec 10, 2024 | NORTH SLIDELL | 0 | $0 |
| Dec 10, 2024 | PEARL RIVER | 0 | $0 |
| Dec 10, 2024 | ALTON | 0 | $0 |
| Dec 10, 2024 | ALTON | 0 | $0 |
| Dec 10, 2024 | ALTON | 0 | $0 |
| Dec 10, 2024 | NORTH SLIDELL | 0 | $0 |
| Dec 10, 2024 | NORTH SLIDELL | 0 | $0 |
| Dec 10, 2024 | NORTH SLIDELL | 0 | $20K |
| Dec 10, 2024 | SLIDELL | 0 | $0 |
| Dec 10, 2024 | NORTH SLIDELL | 0 | $0 |
Other hazards here
More from St. Tammany Parish
- Thunderstorm Wind 361
- Hail 97
- Tornado 70
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Widespread heavy rainfall of 6 to 12 inches across northwest St Tammany Parish during the overnight and morning hours resulted in widespread flash flooding. Numerous roads were flooded during the night in the affected areas. High water rescues were conducted at a number of locations from flooded houses or houses isolated by flood waters. Approximately 90 people were were rescued from Camp Abbey Retreat Center on Friday – March 11. Heavy rainfall eventually caused the Baogue Falaya River, Tchefuncte River and Pearl River to reach major or historic flood levels in the few days following the heavy rainfall. A total of 625 structures within the parish were flooded from flash flooding or riverine flooding with 425 classified as major flood damage or destroyed.
Heavy rain of 5-7��� also fell across the parish with locally higher amounts. Much of this rain fell over the course of just a few hours, resulting in significant flash flooding, especially from Covington through Slidell. Numerous roads became impassable and several homes were flooded. In total, approximately 20 homes were flooded either from the heavy rain or storm surge.
Thunderstorms producing heavy rain resulted in widespread street flooding in western areas of St. Tammany Parish, including Covington, Mandeville and Abita Springs. The heavy rain flooded about 10 homes and four cars just west of Mandeville and flooded about 6 homes and 3 businesses in Covington.
Quick answers
Frequently asked
How many flash flood events are on record in St. Tammany Parish, Louisiana?
123 flash flood events are recorded in St. Tammany Parish between 1998 and 2024, causing 0 direct deaths.
What is the strongest flash flood recorded in St. Tammany Parish?
The strongest flash flood on record in St. Tammany Parish measured 0.
Where does the flash flood data for St. Tammany Parish come from?
All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.
Cite this page
“Flash Flood in St. Tammany Parish, Louisiana.” Severe Weather History. severeweatherhistory.com/county/louisiana/st-tammany-parish/flash-flood/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.