Clarendon County, South Carolina: Natural Disaster Risk and History
Clarendon County, South Carolina has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 76.5 out of 100, higher than about 76% of US counties, with hurricanes, lightning and earthquakes scoring highest of its 18 hazards and $23 million a year in expected losses.
OpenFEMA lists 24 federal disaster declarations that included Clarendon County since 1989, not counting 2 for COVID-19; the latest is EM-3632-SC (Severe Winter Storm, declared 23 January 2026). NOAA's Storm Prediction Center recorded 38 tornadoes touching Clarendon County from 1950 to 2025.
Live weather alerts for South Carolina All official warnings Latest FEMA declarations
Population 31,118 Buildings worth $6.3 billion Area 703 sq mi Risk rank in South Carolina 25 of 46 FIPS 45027
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 High | 94.2 | $11 million | about once every 3.5 years | 75 |
| Lightning | Relatively High | 93.4 | $992,109 | about 61 a year | 95,628 strikes |
| Earthquake | Relatively Low | 88.4 | $2.7 million | about once every 248 years | — |
| Heat wave | Relatively Moderate | 83.1 | $1.2 million | about 5 a year | 77 |
| Wildfire | Relatively Low | 81.2 | $294,459 | about once every 433 years | — |
| Ice storm | Relatively Moderate | 66.6 | $118,171 | about once every 1.2 years | 56 |
| Strong wind | Relatively Moderate | 62.7 | $508,891 | about 4.9 a year | 186 |
| Tornado | Relatively Low | 60.3 | $1.1 million | about once every 2.1 years | 28 |
| Hail | Relatively Low | 58.1 | $230,138 | about 3.8 a year | 145 |
| Drought | Relatively Low | 50.8 | $99,610 | about 12 a year | 357 |
| Inland flooding | Relatively Low | 50.2 | $4.4 million | about once every 2.2 years | 13 |
| Cold wave | Relatively Low | 43.8 | $490,770 | about once every 3.2 years | 6 |
| Winter weather | Relatively Low | 36.1 | $24,737 | about 1.4 a year | 26 |
| Landslide | Very Low | 22.6 | $98 | about once every 7.2 years | — |
| Coastal flooding | No Rating | 0.0 | — | about once every 100 years | — |
| Avalanche | 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 24
Most common: Hurricane 15, Severe Ice Storm 3, Tropical Storm 2, Severe Storm 2.
| Decade | Declarations | Incident types |
|---|---|---|
| 1980s | 1 | Hurricane |
| 1990s | 2 | Hurricane ×2 |
| 2000s | 4 | Hurricane ×2, Severe Ice Storm, Severe Storm |
| 2010s | 11 | Hurricane ×7, Severe Ice Storm ×2, Flood, Severe Storm |
| 2020s | 6 | Hurricane ×3, Tropical Storm ×2, Winter Storm |
The last 10
Widest declarations that included Clarendon County
- Severe Winter Storm (2026, EM-3632-SC): 46 South Carolina counties designated.
- Hurricane Helene (2024, EM-3619-SC): 46 South Carolina counties designated.
- Hurricane Debby (2024, EM-3606-SC): 46 South Carolina counties designated.
Named storms in its declarations: Hurricane Helene (2024), Hurricane Debby (2024), Hurricane Idalia (2023), Hurricane Ian (2022), Hurricane Dorian (2019), Hurricane Florence (2018), Hurricane Irma (2017), Hurricane Matthew (2016), Hurricane Katrina (2005), Tropical Storm Frances (2004), Hurricane Floyd (1999), Hurricane Hugo (1989).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. South Carolina also had 2 statewide declarations with no county list.
Tornado record since 1950 38
| Tornadoes touching the county | 38 |
|---|---|
| Strongest-rated | (E)F2 ×5 |
| Peak month | April (7) |
| Deadliest | 22 Apr 1958, F2, 17.7 mi path, 1 killed, 1 injured |
| Longest path | 4 May 1978, F2, 41.2 mi path, 0 killed, 1 injured |
| Most recent | 30 May 2025, EF1, 10 mi path |
| Deaths / injuries on those paths | 2 / 27 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 17 | 16 | 5 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 3 | 4 | 3 | 8 | 7 | 3 | 9 |
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 Clarendon County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Clarendon County (this page) | — | Relatively Low | 76.5 | Hurricane |
| Sumter County | 32 km | Relatively Moderate | 81.7 | Hurricane |
| Williamsburg County | 46 km | Relatively Moderate | 82.1 | Hurricane |
| Calhoun County | 52 km | Very Low | 22.6 | Hurricane |
| Lee County | 55 km | Very Low | 36.0 | Hurricane |
| Berkeley County | 57 km | Relatively High | 94.8 | Hurricane |
Nearest by distance between county centres. Every county in South Carolina, ranked.
Vulnerability and resilience
| Social vulnerability | Very High 90.9 |
|---|---|
| Community resilience | Relatively Low 28.8 |
| Community risk factor | 1.61 |
| Expected annual loss, all hazards | $23 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 Clarendon County's main hazards
- Right now: National Weather Service alerts for South Carolina · all official warnings on Global Incident Tracker.
- Hurricane: Is there a hurricane now? · Cyclone preparation
- Lightning: Weather alerts for South Carolina
- Earthquake: Earthquakes today · Earthquake safety guide
- 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 Clarendon County
What natural disasters is Clarendon County, South Carolina most at risk from?
Clarendon County, South Carolina has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 76.5 out of 100, higher than about 76% of US counties, with hurricanes, lightning and earthquakes scoring highest of its 18 hazards and $23 million a year in expected losses.
How many federal disaster declarations has Clarendon County had?
OpenFEMA lists 24 federal disaster declarations that included Clarendon County since 1989, not counting 2 for COVID-19; the latest is EM-3632-SC (Severe Winter Storm, declared 23 January 2026). Another 2 South Carolina declarations were made statewide without a county list.
How many tornadoes have hit Clarendon County?
NOAA's Storm Prediction Center recorded 38 tornadoes touching Clarendon County from 1950 to 2025. The deadliest: 22 Apr 1958, F2, 17.7 mi path, 1 killed, 1 injured (deaths and injuries are for the whole path).
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.