West Mifflin, PA
Local storm history & FEMA National Risk Index data
West Mifflin is rated Relatively High for overall natural hazard risk — higher risk than most US counties — based on FEMA's National Risk Index for Allegheny County, PA. The county's highest-rated hazards are inland flooding, cold wave, and strong wind.
Storm events near West Mifflin
NOAA-recorded tornado, hail, and flood events within 25 miles of West Mifflin's center, 2016–2026 — the only hazards NOAA reports with exact coordinates, so these counts are specific to West Mifflin 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 Allegheny County's FEMA National Risk Index scores, covering West Mifflin along with the rest of the county, not a West Mifflin-specific figure.
| Hazard | NRI score | Rating |
|---|---|---|
| Wildfire | 60.4 | Very Low |
| Inland Flooding | 99.2 | Very High |
| Coastal Flooding | — | Not Applicable |
| Earthquake | 87.9 | Relatively Low |
| Heat Wave | 94.3 | Relatively Moderate |
| Tornado | 91.2 | Relatively High |
| Avalanche | 28.1 | Very Low |
| Cold Wave | 98.8 | Very High |
| Drought | 0 | No Rating |
| Hail | 31.3 | Very Low |
| Hurricane | 75.9 | Relatively Low |
| Ice Storm | 96.1 | Very High |
| Landslide | 87.2 | Relatively Low |
| Lightning | 93.7 | Relatively High |
| Strong Wind | 96.3 | Relatively High |
| Tsunami | — | Not Applicable |
| Volcanic Activity | — | Not Applicable |
| Winter Weather | 93.3 | Relatively High |
Source: FEMA National Risk Index v1.20.0, December 2025. See the methodology page for definitions, or the full Allegheny County risk profile for disaster declarations, social vulnerability, and climate projection data.
Other cities in Allegheny County:
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Frequently asked questions
What natural hazards is West Mifflin, PA at risk of?
West Mifflin 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 Allegheny County, where West Mifflin is located, are inland flooding, cold wave, and strong wind.
What is West Mifflin's biggest natural hazard risk?
Inland Flooding is the highest-rated hazard for Allegheny County, where West Mifflin is located, scoring 99.2 out of 100 on FEMA's National Risk Index (rated "Very High").
Is West Mifflin a high-risk area for natural disasters?
Yes — West Mifflin carries higher risk than most US counties for overall natural hazard risk, per FEMA's National Risk Index rating of "Relatively High" for Allegheny County.
Has West Mifflin had tornadoes, hail, or flooding?
NOAA has recorded 29 tornado, 263 hail, 558 inland flooding events within 25 miles of West Mifflin since 2016.