Yuma County, Arizona: Natural Disaster Risk and History
Yuma County, Arizona has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 92.6 out of 100, higher than about 92% of US counties, with earthquakes, heat waves and inland (river and flash) flooding scoring highest of its 18 hazards and $91 million a year in expected losses.
OpenFEMA lists 4 federal disaster declarations that included Yuma County since 1983, not counting 2 for COVID-19; the latest is EM-3241-AZ (Hurricane Katrina Evacuation, declared 12 September 2005). NOAA's Storm Prediction Center recorded 12 tornadoes touching Yuma County from 1950 to 2025.
Live weather alerts for Arizona All official warnings Latest FEMA declarations
Population 203,299 Buildings worth $33 billion Area 5,575 sq mi Risk rank in Arizona 8 of 15 FIPS 04027
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Earthquake | Relatively High | 98.4 | $52 million | about once every 11 years | — |
| Heat wave | Relatively High | 96.7 | $6.4 million | about 16 a year | 106 |
| Inland flooding | Relatively Moderate | 91.0 | $32 million | about 1.3 a year | 37 |
| Drought | Relatively Moderate | 74.8 | $513,249 | about 4 a year | 1,337 |
| Strong wind | Relatively Moderate | 61.2 | $561,962 | about once every 3.1 years | 13 |
| Volcanic activity | Very Low | 59.9 | $23 | rarer than once in 1,000 years | 1 |
| Wildfire | Very Low | 59.2 | $58,462 | rarer than once in 1,000 years | — |
| Landslide | Very Low | 45.9 | $762 | about 3.7 a year | — |
| Lightning | Relatively Low | 43.4 | $136,441 | about 2 a year | 100,197 strikes |
| Hurricane | Very Low | 22.7 | $5,574 | about once every 41 years | 6 |
| Hail | Very Low | 16.8 | $42,931 | about once every 28 years | 1.4 |
| Tornado | Very Low | 14.0 | $90,637 | about once every 14 years | 5 |
| Winter weather | Very Low | 1.1 | — | rarer than once in 1,000 years | 0 |
| Cold wave | No Rating | 0.0 | — | — | 0 |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Ice storm | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 4
Most common: Flood 2, Hurricane 1, Severe Storm 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1980s | 2 | Severe Storm, Flood |
| 1990s | 1 | Flood |
| 2000s | 1 | Hurricane |
The last 4
Widest declarations that included Yuma County
- Hurricane Katrina Evacuation (2005, EM-3241-AZ): 15 Arizona counties designated.
- Severe Storms, Tornadoes & Flooding (1993, DR-977-AZ): 13 Arizona counties designated.
- Flooding (1983, DR-686-AZ): 3 Arizona counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Arizona also had 27 statewide declarations with no county list.
Tornado record since 1950 12
| Tornadoes touching the county | 12 |
|---|---|
| Strongest-rated | (E)F2 ×1 |
| Peak month | September (5) |
| Deadliest | 17 Aug 1959, F2, 0.1 mi path, 0 killed, 1 injured |
| Longest path | 10 Aug 2006, F0, 10 mi path |
| Most recent | 13 Oct 2018, EF0, 0.1 mi path |
| Deaths / injuries on those paths | 0 / 1 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 7 | 4 | 1 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 1 | 1 | 5 | 3 | 0 | 1 | 1 | 0 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Yuma County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Yuma County (this page) | — | Relatively Moderate | 92.6 | Earthquake |
| La Paz County | 107 km | Relatively Moderate | 83.5 | Inland flooding |
| Imperial County, CA | 140 km | Relatively High | 96.5 | Earthquake |
| Maricopa County | 147 km | Very High | 99.9 | Heat wave |
| Pima County | 212 km | Relatively High | 99.1 | Heat wave |
| Riverside County, CA | 222 km | Very High | 99.9 | Wildfire |
Nearest by distance between county centres. Every county in Arizona, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively High 68.5 |
|---|---|
| Community resilience | Very Low 1.2 |
| Community risk factor | 1.41 |
| Expected annual loss, all hazards | $91 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Yuma County's main hazards
- Right now: National Weather Service alerts for Arizona · all official warnings on Global Incident Tracker.
- Earthquake: Earthquakes today · Earthquake safety guide
- Heat wave: Heatstroke warning signs
- Inland flooding: Flood safety: why shallow water kills · Floods recorded
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Yuma County
What natural disasters is Yuma County, Arizona most at risk from?
Yuma County, Arizona has a Relatively Moderate natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 92.6 out of 100, higher than about 92% of US counties, with earthquakes, heat waves and inland (river and flash) flooding scoring highest of its 18 hazards and $91 million a year in expected losses.
How many federal disaster declarations has Yuma County had?
OpenFEMA lists 4 federal disaster declarations that included Yuma County since 1983, not counting 2 for COVID-19; the latest is EM-3241-AZ (Hurricane Katrina Evacuation, declared 12 September 2005). Another 27 Arizona declarations were made statewide without a county list.
How many tornadoes have hit Yuma County?
NOAA's Storm Prediction Center recorded 12 tornadoes touching Yuma County from 1950 to 2025. The deadliest: 17 Aug 1959, F2, 0.1 mi path, 0 killed, 1 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.