Sioux City, IA
Local storm history & FEMA National Risk Index data
Sioux City 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 Woodbury County, IA. The county's highest-rated hazards are tornado, hail, and drought.
Storm events near Sioux City
NOAA-recorded tornado, hail, and flood events within 25 miles of Sioux City's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to Sioux City 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 Woodbury County's FEMA National Risk Index scores, covering Sioux City along with the rest of the county, not a Sioux City-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 87.4 | Relatively Low |
| Inland Flooding | 78.2 | Relatively Moderate |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 30.8 | Very Low |
| Heat Wave | 83.2 | Relatively Moderate |
| Tornado | 96.5 | Relatively High |
| Avalanche | — | Not Applicable |
| Cold Wave | 87.1 | Relatively Moderate |
| Drought | 90.5 | Relatively Moderate |
| Hail | 95 | Relatively High |
| Hurricane | — | Not Applicable |
| Ice Storm | 85.6 | Relatively High |
| Landslide | 84 | Relatively Low |
| Lightning | 51.7 | Relatively Low |
| Strong Wind | 84.1 | Relatively High |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 85.7 | Relatively High |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Woodbury County risk profile for disaster declarations, social vulnerability, and climate projection data.
More on Woodbury County:
Frequently asked questions
What natural hazards is Sioux City, IA at risk of?
Sioux City 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 Woodbury County, where Sioux City is located, are tornado, hail, and drought.
What is Sioux City's biggest natural hazard risk?
Tornado is the highest-rated hazard for Woodbury County, where Sioux City is located, scoring 96.5 out of 100 on FEMA's National Risk Index (rated "Relatively High").
Is Sioux City a high-risk area for natural disasters?
Somewhat — Sioux City 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 Woodbury County.
Has Sioux City had tornadoes, hail, or flooding?
NOAA has recorded 9 tornado, 122 hail, 146 inland flooding events within 25 miles of Sioux City since 2016.