Union County, Florida: Natural Disaster Risk and History
Union County, Florida has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 10.9 out of 100, higher than about 10% of US counties, with hurricanes, wildfires and lightning scoring highest of its 18 hazards and $5.0 million a year in expected losses.
OpenFEMA lists 32 federal disaster declarations that included Union County since 1992, not counting 2 for COVID-19; the latest is DR-4834-FL (Hurricane Milton, declared 11 October 2024). NOAA's Storm Prediction Center recorded 8 tornadoes touching Union County from 1950 to 2025.
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Population 16,088 Buildings worth $1.9 billion Area 252 sq mi Risk rank in Florida 67 of 67 FIPS 12125
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Hurricane | Relatively Low | 81.5 | $2.2 million | about once every 4.8 years | 44 |
| Wildfire | Relatively Low | 73.9 | $231,131 | about once every 276 years | — |
| Lightning | Relatively Low | 48.3 | $216,264 | about 82 a year | 72,047 strikes |
| Heat wave | Very Low | 36.6 | $190,596 | about 3.5 a year | 62 |
| Tornado | Relatively Low | 27.7 | $433,793 | about once every 7.9 years | 7 |
| Earthquake | Very Low | 26.7 | $51,665 | rarer than once in 1,000 years | — |
| Drought | Very Low | 18.8 | $3,016 | about 17 a year | 441 |
| Cold wave | Very Low | 12.2 | $107,540 | about 1.8 a year | 35 |
| Inland flooding | Very Low | 11.1 | $1.4 million | about once every 4.0 years | 7 |
| Strong wind | Very Low | 9.7 | $68,235 | about once a year | 40 |
| Landslide | Very Low | 2.9 | $3 | about once every 34 years | — |
| Winter weather | Very Low | 2.1 | $1,115 | about once every 9.5 years | 2 |
| Hail | Very Low | 1.5 | $1,781 | about 1.8 a year | 70 |
| Coastal flooding | No Rating | 0.0 | — | — | — |
| Avalanche | Not Applicable | — | — | — | — |
| Ice storm | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 32
Most common: Hurricane 16, Severe Storm 6, Fire 5, Tropical Storm 4.
| Decade | Declarations | Incident types |
|---|---|---|
| 1990s | 5 | Fire ×3, Severe Storm ×2 |
| 2000s | 9 | Hurricane ×4, Severe Storm ×2, Fire ×2, Freezing |
| 2010s | 6 | Hurricane ×5, Severe Storm |
| 2020s | 12 | Hurricane ×7, Tropical Storm ×4, Severe Storm |
The last 10
Widest declarations that included Union County
- Hurricane Ian (2022, DR-4673-FL): 67 Florida counties designated.
- Tropical Storm Ian (2022, EM-3584-FL): 67 Florida counties designated.
- Hurricane Dorian (2019, EM-3419-FL): 67 Florida counties designated.
Named storms in its declarations: Hurricane Milton (2024), Hurricane Helene (2024), Tropical Storm Helene (2024), Hurricane Debby (2024), Tropical Storm Debby (2024), Hurricane Idalia (2023), Tropical Storm Idalia (2023), Hurricane Nicole (2022), Hurricane Ian (2022), Tropical Storm Ian (2022), Tropical Storm Elsa (2021), Hurricane Dorian (2019), Hurricane Michael (2018), Hurricane Irma (2017), Hurricane Hermine (2016), Tropical Storm Debby (2012), Tropical Storm Fay (2008), Hurricane Katrina (2005), Hurricane Jeanne (2004), Hurricane Frances (2004), Tropical Storm Bonnie (2004).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Florida also had 31 statewide declarations with no county list.
Tornado record since 1950 8
| Tornadoes touching the county | 8 |
|---|---|
| Strongest-rated | (E)F1 ×4 |
| Peak month | August (3) |
| Deadliest | — |
| Longest path | 23 Apr 1983, F1, 10 mi path |
| Most recent | 4 Aug 2024, EF1, 0.2 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 4 | 4 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 0 | 0 | 1 | 2 | 3 | 0 | 2 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Union County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Union County (this page) | — | Very Low | 10.9 | Hurricane |
| Bradford County | 22 km | Very Low | 36.9 | Hurricane |
| Columbia County | 31 km | Relatively Low | 69.7 | Lightning |
| Baker County | 33 km | Very Low | 13.3 | Wildfire |
| Alachua County | 41 km | Relatively Moderate | 90.3 | Lightning |
| Clay County | 50 km | Relatively Moderate | 81.1 | Lightning |
Nearest by distance between county centres. Every county in Florida, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 39.5 |
|---|---|
| Community resilience | Relatively Low 32.0 |
| Community risk factor | 1.06 |
| Expected annual loss, all hazards | $5.0 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Union County's main hazards
- Right now: National Weather Service alerts for Florida · all official warnings on Global Incident Tracker.
- Hurricane: Is there a hurricane now? · Cyclone preparation
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Lightning: Weather alerts for Florida
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Union County
What natural disasters is Union County, Florida most at risk from?
Union County, Florida has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 10.9 out of 100, higher than about 10% of US counties, with hurricanes, wildfires and lightning scoring highest of its 18 hazards and $5.0 million a year in expected losses.
How many federal disaster declarations has Union County had?
OpenFEMA lists 32 federal disaster declarations that included Union County since 1992, not counting 2 for COVID-19; the latest is DR-4834-FL (Hurricane Milton, declared 11 October 2024). Another 31 Florida declarations were made statewide without a county list.
How many tornadoes have hit Union County?
NOAA's Storm Prediction Center recorded 8 tornadoes touching Union County from 1950 to 2025.
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.