Arnold, MO
Local storm history & FEMA National Risk Index data
Arnold is rated Relatively Moderate for overall natural hazard risk — near the middle compared to other US counties — based on FEMA's National Risk Index for Jefferson County, MO. The county's highest-rated hazards are strong wind, landslide, and tornado.
Storm events near Arnold
NOAA-recorded tornado, hail, and flood events within 25 miles of Arnold's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Arnold 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 Jefferson County's FEMA National Risk Index scores, covering Arnold along with the rest of the county, not a Arnold-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 53.1 | Very Low |
| Inland Flooding | 91.4 | Relatively Moderate |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 93.4 | Relatively Moderate |
| Heat Wave | 92.1 | Relatively Moderate |
| Tornado | 95.1 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 88.9 | Relatively Moderate |
| Drought | 22.3 | Very Low |
| Hail | 93.9 | Relatively Moderate |
| Hurricane | 23.7 | Very Low |
| Ice Storm | 69.4 | Relatively Moderate |
| Landslide | 95.9 | Relatively Moderate |
| Lightning | 91.2 | Relatively High |
| Strong Wind | 98.6 | Very High |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 84.1 | Relatively Moderate |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Jefferson County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Jefferson County:
More on Jefferson County:
Frequently asked questions
What natural hazards is Arnold, MO at risk of?
Arnold is rated Relatively Moderate for overall natural hazard risk by FEMA's National Risk Index — near the middle compared to other US counties. The highest-rated hazards for Jefferson County, where Arnold is located, are strong wind, landslide, and tornado.
What is Arnold's biggest natural hazard risk?
Strong Wind is the highest-rated hazard for Jefferson County, where Arnold is located, scoring 98.6 out of 100 on FEMA's National Risk Index (rated "Very High").
Is Arnold a high-risk area for natural disasters?
Somewhat — Arnold carries near the middle compared to other US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively Moderate" for Jefferson County.
Has Arnold had tornadoes, hail, or flooding?
NOAA has recorded 46 tornado, 323 hail, 73 inland flooding events within 25 miles of Arnold since 2016.