Alpharetta, GA
Local storm history & FEMA National Risk Index data
Alpharetta is rated Relatively High for overall natural hazard risk — higher risk than most US counties — based on FEMA's National Risk Index for Fulton County, GA. The county's highest-rated hazards are lightning, inland flooding, and tornado.
Storm events near Alpharetta
NOAA-recorded tornado, hail, and flood events within 25 miles of Alpharetta's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Alpharetta 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 Fulton County's FEMA National Risk Index scores, covering Alpharetta along with the rest of the county, not a Alpharetta-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 52.9 | Very Low |
| Inland Flooding | 97.7 | Relatively High |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 96 | Relatively Moderate |
| Heat Wave | 92.4 | Relatively Moderate |
| Tornado | 97 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 89.8 | Relatively High |
| Drought | 0 | No Rating |
| Hail | 95.9 | Relatively High |
| Hurricane | 74.9 | Relatively Low |
| Ice Storm | 90.6 | Relatively High |
| Landslide | 91 | Relatively Moderate |
| Lightning | 98.3 | Very High |
| Strong Wind | 93.6 | Relatively High |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 72.4 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Fulton County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Fulton County:
More on Fulton County:
Frequently asked questions
What natural hazards is Alpharetta, GA at risk of?
Alpharetta 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 Fulton County, where Alpharetta is located, are lightning, inland flooding, and tornado.
What is Alpharetta's biggest natural hazard risk?
Lightning is the highest-rated hazard for Fulton County, where Alpharetta is located, scoring 98.3 out of 100 on FEMA's National Risk Index (rated "Very High").
Is Alpharetta a high-risk area for natural disasters?
Yes — Alpharetta carries higher risk than most US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively High" for Fulton County.
Has Alpharetta had tornadoes, hail, or flooding?
NOAA has recorded 14 tornado, 112 hail, 80 inland flooding events within 25 miles of Alpharetta since 2016.