Connecticut tornado risk
Capitol Planning Region has the highest tornado risk in Connecticut, scoring 90.5 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Capitol Planning Region | 90.5 | Relatively High | 0 |
| 2 | South Central Connecticut Planning Region | 78 | Relatively Moderate | 0 |
| 3 | Naugatuck Valley Planning Region | 73.1 | Relatively Moderate | 0 |
| 4 | Western Connecticut Planning Region | 69.2 | Relatively Moderate | 0 |
| 5 | Southeastern Connecticut Planning Region | 53.1 | Relatively Low | 0 |
| 6 | Lower Connecticut River Valley Planning Region | 43.3 | Relatively Low | 0 |
| 7 | Northwest Hills Planning Region | 42.9 | Relatively Low | 0 |
| 8 | Greater Bridgeport Planning Region | 41.7 | Relatively Low | 0 |
| 9 | Northeastern Connecticut Planning Region | 28.3 | Relatively Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Tornado risk nationally:
Other hazard risks in Connecticut:
Frequently asked questions
What is the highest tornado risk county in Connecticut?
Capitol Planning Region, CT has the highest tornado risk in Connecticut, with a FEMA National Risk Index score of 90.5 out of 100 (rated "Relatively High").
What causes tornado risk in Connecticut?
Tornado risk concentrates in the central and southern plains ("Tornado Alley") and the Southeast ("Dixie Alley"), where atmospheric conditions favor supercell thunderstorm development. The highest scores often belong to counties with significant mobile home and manufactured housing stock, which carries disproportionate tornado mortality risk.