FEMA rates relative tornado risk for Hamilton County as relatively high and reports historical annualized frequency of 0.37 events per year for the area.
FEMA summary
FEMA's profile for Hamilton County reports historical annualized frequency of 0.37 events per year for tornado. FEMA's relative risk rating for the area is relatively high; the annualized frequency is a separate measure.
Hazard metrics cover FEMA county-equivalent geographies rather than individual addresses or parcels. Use local or state hazard maps before making a property, insurance, retrofit, or evacuation decision.
Select a hazard to inspect FEMA's figures for Hamilton County.
Tornado
FEMA combines its area-wide loss estimate and community data in this relative rating. Event frequency appears separately below.
Relative FEMA score
98.6/100
FEMA annualizes recorded qualifying tornado occurrences across the FEMA geography and source period.
The area loss estimate combines FEMA's modeled losses to buildings, population, and agriculture across Hamilton County. It is not an estimate for a home or address.
Local context
Chattanooga’s severe-weather planning pairs tornado safety with thunderstorm and flash-flood awareness. Tornadoes can develop quickly, while heavy rain can block or complicate travel, so the safest plan is usually to shelter where you are instead of depending on a last-minute drive across the city.
The city advises residents not to rely on outdoor sirens to wake them or to be heard indoors. Hamilton Ready Alerts provide local text and email notifications, but every household still needs a predetermined lowest-floor interior room and a backup way to receive warnings during a power or internet outage.
For homeowners and movers
Preparedness actions
Living in Chattanooga? Learn how to handle water storage, sanitation, and security in a small space.
The map shows Chattanooga. All FEMA figures on this page cover Hamilton County.
The FEMA figures cover Hamilton County. Address-level conditions require local maps, building records, and property details.
FEMA rates relative tornado risk for Hamilton County as relatively high. Its historical annualized frequency is 0.37 events per year. Damage at a specific address also depends on the building, soil, elevation, and exact hazard zone.
Among 9 Tennessee cities covered by this directory, Chattanooga is #2 for relative tornado risk based on FEMA's score for Hamilton County. Homes within Chattanooga can have different soil, elevation, construction, and hazard-zone conditions.
In FEMA's data for Hamilton County, the highest relative ratings are Tornado (Relatively High), Lightning (Relatively High), and Strong Wind (Relatively High). FEMA uses estimated losses and community data along with event frequency when assigning these ratings.
The hazard numbers cover Hamilton County. For an individual home, check local fault, flood, fire, evacuation, and building records for the exact address.
FEMA gives Hamilton County an overall relative risk rating of relatively moderate. Conditions at a specific home depend on its hazard zones, building type, maintenance, insurance, and access to evacuation routes and emergency services.
Start with this step: Identify the lowest-floor interior room or nearby rated shelter you can reach quickly. Enable Wireless Emergency Alerts and keep a battery-powered NOAA Weather Radio available. Use Ready.gov Tornadoes and local emergency guidance for a complete plan.
Distances are measured between city coordinates.
| City | Distance | Tornado rating | Relative score |
|---|---|---|---|
| Huntsville, AL | 83 mi | Relatively High | 98.3 |
| Murfreesboro, TN | 85 mi | Relatively High | 95.5 |
| Roswell, GA | 87 mi | Relatively High | 97.3 |
| Sandy Springs, GA | 93 mi | Relatively High | 97.3 |
| Johns Creek, GA | 93 mi | Relatively High | 97.3 |
Limited to products tagged for tornado or general preparedness.
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Hazard metrics come from FEMA National Risk Index v1.19.0 (March 2023). City population and coordinates come from SimpleMaps US Cities Database. For current conditions, use official local maps, warnings, inspections, and professional advice.