St. Tammany Parish, Louisiana severe weather history spans 715 recorded events between 1957 and 2026. The dominant hazard is thunderstorm wind, accounting for 50.5% of all recorded events. It ranks #377 nationally and #6 in Louisiana.
715
Recorded events
5
Direct deaths
89
Direct injuries
$28.5M
Property damage
The record
What the St. Tammany Parish, Louisiana severe weather history record shows
Across the archive, St. Tammany Parish, Louisiana severe weather history averages 10.4 recorded events a year. The busiest stretch on record is the 2020s, with 211 events logged in that decade alone. Roughly 73 events fall before 1990 and 642 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The deadliest hazard in the St. Tammany Parish, Louisiana record is thunderstorm wind, responsible for 4 direct deaths. The costliest is flash flood, with $10.8M in reported property damage. In total, 8 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in St. Tammany Parish
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Thunderstorm Wind | 361 | 4 | $3.2M | 70 | 1957–2026 |
| Flash Flood | 123 | 0 | $10.8M | 0 | 1998–2024 |
| Hail | 97 | 0 | $0 | 3 | 1973–2024 |
| Tornado | 70 | 0 | $9.8M | F2 | 1957–2026 |
| Lightning | 26 | 1 | $720K | 0 | 1996–2025 |
| Flood | 23 | 0 | $4.1M | 0 | 1996–2022 |
| Funnel Cloud | 8 | 0 | $0 | 0 | 1997–2008 |
| Heavy Rain | 7 | 0 | $0 | 0 | 2008–2021 |
Decade by decade
St. Tammany Parish, Louisiana severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
76 mapped tornado paths intersect this county: 75 touched down inside it and 1 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 2011-05-26 | EF3 | 0 | 4 | 6.1 mi | Touched down here |
| 2024-04-10 | EF2 | 0 | 0 | 7.9 mi | Touched down here |
| 2024-04-10 | EF2 | 0 | 0 | 11.0 mi | Touched down here |
| 2017-02-07 | EF2 | 0 | 3 | 23.1 mi | Crossed in |
| 2011-03-09 | EF2 | 0 | 0 | 1.9 mi | Touched down here |
| 2004-11-24 | EF2 | 0 | 4 | 4.0 mi | Touched down here |
| 1997-11-21 | EF2 | 0 | 43 | 9.0 mi | Touched down here |
| 1980-04-13 | EF2 | 0 | 0 | 15.1 mi | Touched down here |
| 1974-11-20 | EF2 | 0 | 0 | 7.1 mi | Touched down here |
| 1964-10-04 | EF2 | 0 | 0 | 1.0 mi | Touched down here |
Significant events
Deadliest events on record in St. Tammany Parish
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Jul 26, 1987 | Thunderstorm Wind | 1 | 3 | $0 | |
| Jun 13, 2007 | Thunderstorm Wind | COVINGTON | 1 | 1 | $60K |
| Apr 27, 2016 | Lightning | MC CLANE CITY | 1 | 0 | $0 |
| Aug 14, 1999 | Thunderstorm Wind | MADISONVILLE | 1 | 0 | $1K |
| Dec 18, 1995 | Thunderstorm Wind | Folsom | 1 | 0 | $0 |
| Nov 21, 1997 | Tornado | COVINGTON | 0 | 43 | $3.5M |
| Aug 13, 2011 | Lightning | BLOND | 0 | 15 | $0 |
| Oct 25, 1997 | Lightning | COVINGTON | 0 | 6 | $0 |
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Numerous trees and power lines along Tyler Street and nearby parallel streets between 19th Avenue and 23rd Avenue were knocked down by thunderstorm winds. Two vehicles and one residence were damaged by the falling trees. In one of the vehicles crushed by falling trees, one of the occupants was killed and another seriously injured.
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.
Six to twelve inches of rainfall, most of which fell in one day, led to major flooding along the Tchefuncte River in St. Tammany Parish. Approximately 100 homes and businesses suffered varying degrees of damage due to the flooding and numerous roads, including Hwy 21 were closed due to high water. These same areas were also impacted by the major flooding in March of this year. The end time of the event is based on when the Tchefuncte River near Covington dropped below flood stage.
Context
Risk, population and federal disasters
Relatively High
FEMA NRI risk rating
272,421
Population (ACS)
$284K
Median home value
50
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Jun 30, 2026 | Tropical Storm | TROPICAL STORM ARTHUR | DR |
| Jan 24, 2026 | Winter Storm | SEVERE WINTER STORM | EM |
| Sep 16, 2024 | Hurricane | HURRICANE FRANCINE | DR |
| Sep 10, 2024 | Hurricane | TROPICAL STORM FRANCINE | EM |
| Sep 13, 2021 | Coastal Storm | TROPICAL STORM NICHOLAS | EM |
| Aug 29, 2021 | Hurricane | HURRICANE IDA | DR |
Within the county
Most affected places
- Slidell 130
- Mandeville 115
Quick answers
Frequently asked
How many severe weather events have been recorded in St. Tammany Parish, Louisiana?
715 events are on record between 1957 and 2026, causing 5 direct deaths and $28.5M in property damage.
What is the most common severe weather hazard in St. Tammany Parish?
Thunderstorm Wind, with 361 recorded events — 50.5% of everything in the archive for this county.
How many tornadoes have crossed St. Tammany Parish?
76 mapped tornado paths intersect the county boundary; 75 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover St. Tammany Parish?
50 federal disaster declarations from FEMA include St. Tammany Parish, each tied to a specific incident period.
How risky is St. Tammany Parish compared with the rest of the country?
FEMA's National Risk Index rates St. Tammany Parish as relatively high risk, placing it in the 97 percentile of its state for expected annual loss.
Where does the St. Tammany Parish, Louisiana severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- St. Mary Parish 192
- Tangipahoa Parish 488
- St. Martin Parish 187
- Tensas Parish 313
- St. Landry Parish 407
- Terrebonne Parish 262
Cite this page
“St. Tammany Parish, Louisiana.” Severe Weather History. severeweatherhistory.com/county/louisiana/st-tammany-parish/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.