Union County, Mississippi

What hazards hit Union County most?

The most frequent records are severe thunderstorm wind events: 137 since 1965. 40% of its severe thunderstorm wind events since 1965 fell in April and May. The rank column places the county among Mississippi'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 Union County had?

NOAA records 27 tornadoes in Union County from 1950 to 2025, the strongest rated F3, with 4 deaths and 31 injuries recorded in the county. That is 40th of 82 Mississippi 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 27 tornadoes whose track touched Union County since 1950 (NOAA's county records number 27, the same count); along their whole tracks they killed 9 people, 4 of them in Union County.

Map of the strongest tornado tracks in Mississippi.

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 Union County?

The most recent record with damage, injuries or deaths is the February 26, 2026 thunderstorm wind.

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

A damage figure marked "step" is a record from before 1993: NOAA then filed damage by category, and the figure is the category as entered, in the dollars of that year, not an estimate of the loss.

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 Union County'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?

40% of its severe thunderstorm wind events since 1965 fell in April and May. The two busiest months are in violet.

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

Federal disaster declarations for Union County

FEMA's register lists 19 declarations that include Union County: 15 major disasters, 4 emergencies and 0 fire management assistance declarations. Most were for severe storm (9) and hurricane (4).

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 Union County had?

NOAA's Storm Events Database holds 32 flood or flash flood records for Union County from 1999 to 2025, on 28 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Union County ranks 2105th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $504,000 on 19 claims filed in Union County; the most in one year was 5 in 2004. 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 Union County

FEMA's National Risk Index rates Union County Relatively Low overall, with an expected annual loss of $10.5 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 Union County

1. Lee County 881
2. Lafayette County 541
3. Pontotoc County 535
4. Union County 460
5. Marshall County 439
6. Prentiss County 396
7. Tippah County 381
8. Benton County 262

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 MississippiEvery Mississippi tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in MississippiThe state's severe thunderstorm wind events, by county, year and month
• The Mississippi recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Union CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Union County's FEMA declarations (CSV)19 rows: every declaration that named the county, for your own analysis