St. Tammany Parish, Louisiana

What hazards hit St. Tammany Parish most?

The most frequent records are severe thunderstorm wind events: 370 since 1957. The rank column places the county among Louisiana's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has St. Tammany Parish had?

NOAA records 74 tornadoes in St. Tammany Parish from 1957 to 2026, the strongest rated EF3, with 0 deaths and 55 injuries recorded in the county. That is 16th of 64 Louisiana counties and 206th of 3,080 U.S. counties by days with tornadoes per 1,000 square miles since 1950. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 75 tornadoes whose track touched St. Tammany Parish since 1950 (NOAA's county records number 74: they file a crossing tornado once per county segment, and the two databases differ on some tracks); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in Louisiana.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in St. Tammany Parish?

The most recent record with damage, injuries or deaths is the June 18, 2026 tornado ($250,000 in damage in 2025 dollars).

NWS ground survey confirmed an EF-1 tornado with maximum sustained winds of 105 mph. The tornado began near or before moving into Treasure Isle where it flipped a large boat on its side. Additional visible damage to homes and lofting of outdoor fixtures was noted as the tornado moved into Martin Drive. The tornado reached EF-1 intensity near Bluegill Drive where it removed shingles off of homes, snapped a few trees, and collapsed garage door structures and blew out a wall or two as a result in two different homes. A defined damage path was observed on LA Hwy 433 and then crossed into inaccesible marsh areas. A weak tornado debris signature was evident on KHDC and is the basis for connecting this damage to Avery Estates. The tornado continued northeast into Avery Estates where minor metal roof damage and tree damage was noted on Avery Drive and Smokey Hollow Drive. …
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1346255)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for St. Tammany Parish's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

Records by month in St. Tammany Parish. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for St. Tammany Parish

FEMA's register lists 50 declarations that include St. Tammany Parish: 31 major disasters, 19 emergencies and 0 fire management assistance declarations. Most were for hurricane (29) and flood (7).

The 40 most recent of 50 are listed; the CSV has every one.

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has St. Tammany Parish had?

NOAA's Storm Events Database holds 164 flood or flash flood records for St. Tammany Parish from 1996 to 2026, on 86 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), St. Tammany Parish ranks 10th of 2,942 U.S. counties. The 100 counties with the most claims

The National Flood Insurance Program has paid $1.8 billion on 38,420 claims filed in St. Tammany Parish; the most in one year was 18,281 in 2005. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for St. Tammany Parish

FEMA's National Risk Index rates St. Tammany Parish Relatively High overall, with an expected annual loss of $249 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with St. Tammany Parish

1. St. Tammany Parish 932
2. Jefferson Parish 768
3. Tangipahoa Parish 664
4. Orleans Parish 628
5. Hancock County, MS 455
6. Pearl River County, MS 439
7. Washington Parish 366
8. St. Bernard Parish 339
9. St. John the Baptist Parish 194

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in LouisianaEvery Louisiana tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in LouisianaThe state's severe thunderstorm wind events, by county, year and month
• The Louisiana recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in St. Tammany ParishThe hazard risk calculator: 18 hazards beside the county's record
• Download St. Tammany Parish's FEMA declarations (CSV)50 rows: every declaration that named the county, for your own analysis