Loudon County, Tennessee

What hazards hit Loudon County most?

The most frequent records are severe thunderstorm wind events: 226 since 1957. 43% of its severe thunderstorm wind events since 1957 fell in June and July. The rank column places the county among Tennessee'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 Loudon County had?

NOAA records 9 tornadoes in Loudon County from 1965 to 2025, the strongest rated F3, with 1 death and 60 injuries recorded in the county. That is 35th of 95 Tennessee 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 9 tornadoes whose track touched Loudon County since 1950 (NOAA's county records number 9, the same count); along their whole tracks they killed 1 person.

Map of the strongest tornado tracks in Tennessee.

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 Loudon County?

The most recent record with damage, injuries or deaths is the May 30, 2025 tornado (3 injuries and $100,000 in damage in 2025 dollars).

An EF0 tornado touched down in southern Loudon County in the early morning hours with max winds of 85 mph. Tornado was in Loudon County for roughly 1 mile before exiting into northern Monroe County east of Holt Road. Several injuries occurred when either the tornado itself or the rear flank downdraft winds rolled a camper RV several times up and over a wooden service post. In addition to the RV on the south side of the damage swath, several trees suffered damage, there was roof damage to small structures and a barn, and the tornado left cycloidal markings in the field beyond the RV and houses. When the tornado reached the tree line at the edge of Loudon, several trees had large branches broken off.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1265406)

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 Loudon 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?

43% of its severe thunderstorm wind events since 1957 fell in June and July. The two busiest months are in violet.

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

Federal disaster declarations for Loudon County

FEMA's register lists 20 declarations that include Loudon County: 15 major disasters, 5 emergencies and 0 fire management assistance declarations. Most were for severe storm (10) and winter storm (2).

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 Loudon County had?

NOAA's Storm Events Database holds 26 flood or flash flood records for Loudon County from 1997 to 2026, on 23 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Loudon County ranks 1710th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $510,000 on 45 claims filed in Loudon County; the most in one year was 8 in 2002. 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 Loudon County

FEMA's National Risk Index rates Loudon County Relatively Low overall, with an expected annual loss of $22.2 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 Loudon County

1. Knox County 867
2. Blount County 714
3. Monroe County 548
4. McMinn County 539
5. Roane County 443
6. Loudon County 374

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 TennesseeEvery Tennessee tornado since 1950 and the counties with the most per square mile
• Severe thunderstorm wind in TennesseeThe state's severe thunderstorm wind events, by county, year and month
• The Tennessee recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Loudon CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Loudon County's FEMA declarations (CSV)20 rows: every declaration that named the county, for your own analysis