Marietta, GA
Local storm history & FEMA National Risk Index data
Marietta is rated Relatively High for overall natural hazard risk — higher risk than most US counties — based on FEMA's National Risk Index for Cobb County, GA. The county's highest-rated hazards are tornado, hail, and lightning.
Storm events near Marietta
NOAA-recorded tornado, hail, and flood events within 25 miles of Marietta's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Marietta itself, not the whole county.
County-wide hazard risk
Every other hazard FEMA and NOAA track — including drought — is only scored at the county level. These are Cobb County's FEMA National Risk Index scores, covering Marietta along with the rest of the county, not a Marietta-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 51.7 | Very Low |
| Inland Flooding | 96.1 | Relatively High |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 92.3 | Relatively Moderate |
| Heat Wave | 89 | Relatively Moderate |
| Tornado | 98.3 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 96.8 | Relatively High |
| Drought | 0 | No Rating |
| Hail | 97.3 | Relatively High |
| Hurricane | 68.1 | Relatively Low |
| Ice Storm | 93.5 | Relatively High |
| Landslide | 76.7 | Relatively Low |
| Lightning | 97.2 | Very High |
| Strong Wind | 83.6 | Relatively Moderate |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 75.4 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Cobb County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Cobb County:
More on Cobb County:
Frequently asked questions
What natural hazards is Marietta, GA at risk of?
Marietta is rated Relatively High for overall natural hazard risk by FEMA's National Risk Index — higher risk than most US counties. The highest-rated hazards for Cobb County, where Marietta is located, are tornado, hail, and lightning.
What is Marietta's biggest natural hazard risk?
Tornado is the highest-rated hazard for Cobb County, where Marietta is located, scoring 98.3 out of 100 on FEMA's National Risk Index (rated "Relatively High").
Is Marietta a high-risk area for natural disasters?
Yes — Marietta carries higher risk than most US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively High" for Cobb County.
Has Marietta had tornadoes, hail, or flooding?
NOAA has recorded 24 tornado, 121 hail, 117 inland flooding events within 25 miles of Marietta since 2016.