On FEMA’s figures, Thunderbolt faces more hazard damage per building than 97% of U.S. towns, mostly from hurricanes
On FEMA’s National Risk Index, Thunderbolt gets a D− for hazard risk: higher expected damage per building than 97% of U.S. towns, #260 of 264 in Georgia. Most of that expected damage is hurricanes (66%), then coastal flooding (15%). Flood insurance has paid 34 claims here since 1994.
Graded on FEMA’s expected yearly building damage per dollar of building value (NRI v1.20, December 2025), weighted by where residents live; flood claims are shown, not graded. How hazard risk is graded
What stands out about Thunderbolt’s natural hazards
From FEMA’s model and FEMA’s records, below.
What Thunderbolt faces
Each hazard’s share of the building damage FEMA expects here, and how its rate compares with the rest of the country.
Hurricanes
Coastal flooding
River and rain flooding
Shares are of FEMA’s expected building damage, the measure the grade uses; ranks compare each hazard’s building-damage rate with all 85,154 U.S. census tracts. In FEMA’s terms, river and rain flooding is FEMA’s “Inland Flooding” (rivers and streams overflowing their banks, or rain overwhelming drainage). FEMA defines coastal flooding as high or rising tides and storm surge, so surge damage is counted there. Drought isn’t listed: FEMA counts its losses in crops only.
What’s behind Thunderbolt’s grade
Hurricanes are 66% of the building damage FEMA expects in Thunderbolt, and Thunderbolt’s rate of hurricanes damage is in the top 2% of U.S. census tracts. Coastal flooding adds 15%, at a rate in the top 1% of U.S. census tracts.
D− #260 of 264 in Georgia; higher expected damage per building than 97% of U.S. towns (21,298).
Thunderbolt’s residents live in 2 census tracts; FEMA’s figures are combined by where they live.
The typical Georgia town has lower expected damage than 72% of U.S. towns; within the state, Thunderbolt has more expected damage per building than 98% of Georgia towns.
In dollars, FEMA expects about $2.4M a year in losses across Thunderbolt: $2.1M to buildings, the rest to people and crops.
Does Thunderbolt flood? Sometimes: 34 flood claims since 1994
Every paid claim on a federal flood insurance policy in Thunderbolt, from FEMA’s records: 24.5 per 1,000 homes, more than 86% of the 13,809 U.S. towns with a flood insurance record.
- Hurricane Irma12 claims · $478K
- Hurricane Matthew5 claims · $162K
- Hurricane Debby1 claim · $8K
Thunderbolt is in FEMA’s Community Rating System (class 6) for its flood-proofing work.
Insurance rates: Chatham County.5 federal disasters brought FEMA money to Thunderbolt
Disasters that paid out in Thunderbolt itself (aid to households or repair grants to the Town of Thunderbolt), newest first, with that year’s flood claims.
- 2024Hurricane Helene35 households applied for aid$8K aid approved$471K to the Town of Thunderbolt for repairs
- 2024Tropical Storm Debby3 households applied for aid$300 aid approved1 flood claim paid for it, $8K
- 2017Hurricane Irma36 households applied for aid$6K aid approved$41K to the Town of Thunderbolt for repairs12 flood claims paid for it, $478K
- 2016Hurricane Matthew27 households applied for aid$7K aid approved$167K to the Town of Thunderbolt for repairs5 flood claims paid for it, $162K
- 1999Hurricane Floyd Emergency Declarations$7K to the Town of Thunderbolt for repairs4 flood claims paid that year
Chatham County has had 12 natural disasters declared by the President since 1953, most often hurricanes and tropical storms, then severe storms. Not counted: the 2005 Hurricane Katrina evacuee emergency, which covered counties that took in evacuees.
Old photos of Thunderbolt after a storm or flood belong in the town’s history. Add one, or share what you remember below.
Add to the Thunderbolt archive →Thunderbolt and its neighbors
Thunderbolt is 3rd of the 3 graded towns here, from least expected damage per building to most. Tap a town to see its hazards.
| Town | Hazard risk | Mostly (buildings) | Flood claims |
|---|---|---|---|
| Savannah | D−more damage than 96% | hurricanes | 1,854 |
| Whitemarsh Island | D−more damage than 97% | hurricanes | 29 |
| Thunderbolt | D−more damage than 97% | hurricanes | 34 |
Hazard risk = FEMA’s expected yearly building damage per dollar of building value, vs. the 21,298 U.S. towns we grade; the map is shaded by fifths of the same scale. Flood claims = paid federal flood insurance claims on record.
Get ready for what Thunderbolt faces
A short kit for the hazards that drive the building damage here, what to check before you buy, and where neighbors get alerts.
- The season runs June through November and peaks from mid-August to mid-October.
- Bring in porch furniture and anything the wind can throw.
- Fill the gas tank and charge phones before the storm arrives.
- Know your evacuation zone and the way off the coast.
- Storm surge comes fast: leave when you’re told, not when the water arrives.
- Move cars to high ground before king tides and nor’easters.
- Turn around at flooded roads: a foot of moving water can carry off a car.
- Flood insurance usually takes 30 days to start, so buy it before the forecast.
- Keep papers and medicines up high, in a grab-and-go bag.
- Look up the address on FEMA’s flood map.
- Ask the seller or landlord whether it has ever flooded, and what flood insurance costs there.
- Get a flood insurance quote early: policies usually start 30 days after you buy.
- Thunderbolt residents get 20% off flood insurance.
Know where neighbors sign up for alerts? Add it to the Handbook so everyone has it.
Questions about natural hazards in Thunderbolt
Is Thunderbolt at risk for natural disasters?
On FEMA’s National Risk Index, Thunderbolt has higher expected damage per building than 97% of U.S. towns: D− for hazard risk, #260 of 264 in Georgia. Most of the expected damage is hurricanes (66%) and coastal flooding (15%). This is FEMA’s model of an average year for today’s buildings, not a forecast.
Does Thunderbolt flood?
Flood insurance has paid 34 claims in Thunderbolt since 1994, $1.1M in all, or 24.5 per 1,000 homes, more than 86% of U.S. towns with a flood insurance record. 3 properties have flooded more than once. The most claims came from Hurricane Irma (12).
Is Thunderbolt in a flood zone?
Flood zones are drawn street by street, so the answer depends on the address: look it up on FEMA’s flood map. In Chatham County, 81% of homes in mapped flood zones carry federal flood insurance, and 20.6% of all homes do.
How much is flood insurance in Thunderbolt?
Thunderbolt is in FEMA’s Community Rating System (class 6), which takes 20% off federal flood insurance policies for its flood-proofing work. Premiums depend on the building; policies usually start 30 days after you buy, so get a quote early.
What was the biggest storm in Thunderbolt?
By FEMA money that reached Thunderbolt, Hurricane Helene (2024): 35 households applied for aid, $8K approved, and $471K to the Town of Thunderbolt for repairs. By flood claims, Hurricane Irma: 12 paid, $478K.
Is Thunderbolt at risk from hurricanes?
It is the largest share of the building damage FEMA expects here (66%), and Thunderbolt’s rate for it is in the top 2% of U.S. census tracts.
Storm stories
Memories, warnings and help from neighbors in Thunderbolt.
Sources: FEMA National Risk Index v1.20 (December 2025), census-tract table, combined by where Thunderbolt’s residents lived in the 2020 census; OpenFEMA: NFIP redacted claims, multiple-loss properties, community status book and residential penetration rates, housing assistance (owners and renters), public assistance funded projects, hazard mitigation properties and disaster declarations. Homes: Census ACS 2020–24. Preparedness tips: Ready.gov. FEMA’s model is an average of expected damage, not a forecast. How hazard risk is graded.