Lyon County, Nevada: Natural Disaster Risk and History
Lyon County, Nevada has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 71.4 out of 100, higher than about 71% of US counties, with wildfires, earthquakes and winter storms scoring highest of its 18 hazards and $33 million a year in expected losses.
OpenFEMA lists 12 federal disaster declarations that included Lyon County since 1965, not counting 2 for COVID-19; the latest is DR-4708-NV (Severe Winter Storms, Flooding, Landslides, and Mudslides, declared 27 April 2023). NOAA's Storm Prediction Center recorded 5 tornadoes touching Lyon County from 1950 to 2025.
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Population 59,117 Buildings worth $12 billion Area 2,047 sq mi Risk rank in Nevada 7 of 17 FIPS 32019
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Wildfire | Relatively Moderate | 96.8 | $7.4 million | about once every 188 years | — |
| Earthquake | Relatively Moderate | 93.8 | $12 million | about once every 22 years | — |
| Winter weather | Relatively High | 90.9 | $475,860 | about 6.5 a year | 124 |
| Drought | Relatively Moderate | 69.9 | $570,317 | about 99 a year | 3,283 |
| Heat wave | Relatively Low | 67.6 | $893,398 | about 4 a year | 59 |
| Inland flooding | Relatively Low | 63.5 | $11 million | about once a year | 28 |
| Lightning | Relatively Low | 55.4 | $312,679 | about 18 a year | 43,663 strikes |
| Volcanic activity | Very Low | 50.8 | $15 | rarer than once in 1,000 years | 5 |
| Landslide | Very Low | 34.4 | $473 | about 4 a year | — |
| Ice storm | Relatively Low | 34.3 | $43,784 | about once every 67 years | 0 |
| Hail | Very Low | 33.5 | $150,866 | about once every 6.7 years | 5.6 |
| Strong wind | Relatively Low | 25.2 | $263,583 | about once every 6.5 years | 6 |
| Avalanche | Very Low | 21.6 | $48 | about once every 100 years | 0 |
| Tornado | Very Low | 2.2 | $4,073 | about once every 15 years | 5 |
| Cold wave | No Rating | 0.0 | — | — | 0 |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | 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 12
Most common: Severe Storm 4, Flood 3, Fire 2, Snowstorm 2.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Flood |
| 1980s | 1 | Flood |
| 1990s | 1 | Severe Storm |
| 2000s | 6 | Severe Storm ×2, Snowstorm ×2, Fire, Hurricane |
| 2010s | 2 | Fire, Severe Storm |
| 2020s | 1 | Flood |
The last 10
Widest declarations that included Lyon County
- Hurricane Katrina Evacuation (2005, EM-3243-NV): 17 Nevada counties designated.
- Snow (2005, EM-3204-NV): 16 Nevada counties designated.
- Record and/Or Near Record Snow (2005, EM-3202-NV): 15 Nevada 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. Nevada also had 19 statewide declarations with no county list.
Tornado record since 1950 5
| Tornadoes touching the county | 5 |
|---|---|
| Strongest-rated | (E)F0 ×5 |
| Peak month | June (5) |
| Deadliest | — |
| Longest path | 7 Jun 1989, F0, 1 mi path |
| Most recent | 11 Jun 1998, F0, 0.1 mi path |
| Deaths / injuries on those paths | 0 / 0 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 5 | 0 | 0 | 0 | 0 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 0 | 0 | 0 | 1 | 4 | 0 | 0 | 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 Lyon County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Lyon County (this page) | — | Relatively Low | 71.4 | Wildfire |
| Douglas County | 38 km | Relatively Moderate | 84.4 | Wildfire |
| Carson City | 49 km | Relatively Low | 76.1 | Earthquake |
| Storey County | 56 km | Very Low | 25.2 | Wildfire |
| Alpine County, CA | 72 km | Very Low | 10.6 | Avalanche |
| Mineral County | 85 km | Very Low | 9.8 | Earthquake |
Nearest by distance between county centres. Every county in Nevada, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 25.2 |
|---|---|
| Community resilience | Very Low 14.5 |
| Community risk factor | 0.95 |
| Expected annual loss, all hazards | $33 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 Lyon County's main hazards
- Right now: National Weather Service alerts for Nevada · all official warnings on Global Incident Tracker.
- Wildfire: US wildfires now · Wildfire smoke: what protects you
- Earthquake: Earthquakes today · Earthquake safety guide
- Winter weather: Power outages now · Carbon monoxide in winter
- 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 Lyon County
What natural disasters is Lyon County, Nevada most at risk from?
Lyon County, Nevada has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 71.4 out of 100, higher than about 71% of US counties, with wildfires, earthquakes and winter storms scoring highest of its 18 hazards and $33 million a year in expected losses.
How many federal disaster declarations has Lyon County had?
OpenFEMA lists 12 federal disaster declarations that included Lyon County since 1965, not counting 2 for COVID-19; the latest is DR-4708-NV (Severe Winter Storms, Flooding, Landslides, and Mudslides, declared 27 April 2023). Another 19 Nevada declarations were made statewide without a county list.
How many tornadoes have hit Lyon County?
NOAA's Storm Prediction Center recorded 5 tornadoes touching Lyon County from 1950 to 2025.
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.