Polk County, Nebraska: Natural Disaster Risk and History
Polk County, Nebraska has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 25.7 out of 100, higher than about 25% of US counties, with hail, drought and strong winds scoring highest of its 18 hazards and $12 million a year in expected losses.
OpenFEMA lists 18 federal disaster declarations that included Polk County since 1967, not counting 2 for COVID-19; the latest is DR-4868-NE (Severe Winter Storm and Straight-Line Winds, declared 21 May 2025). NOAA's Storm Prediction Center recorded 38 tornadoes touching Polk County from 1950 to 2025.
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Population 5,214 Buildings worth $1.8 billion Area 445 sq mi Risk rank in Nebraska 38 of 93 FIPS 31143
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Hail | Relatively High | 95.5 | $4.6 million | about 7.3 a year | 277 |
| Drought | Relatively Moderate | 81.3 | $1.5 million | about 43 a year | 1,232 |
| Strong wind | Relatively Moderate | 73.0 | $1.5 million | about 4.1 a year | 157 |
| Ice storm | Relatively Low | 52.6 | $138,556 | about once every 1.4 years | 47 |
| Lightning | Relatively Low | 46.4 | $298,243 | about 44 a year | 38,423 strikes |
| Winter weather | Relatively Low | 43.6 | $75,259 | about 14 a year | 258 |
| Wildfire | Very Low | 38.4 | $33,675 | rarer than once in 1,000 years | — |
| Tornado | Relatively Low | 36.8 | $1.1 million | about once every 2.5 years | 26 |
| Heat wave | Very Low | 23.0 | $116,681 | about 5.3 a year | 85 |
| Inland flooding | Very Low | 16.4 | $2.8 million | about once every 1.6 years | 17 |
| Cold wave | Very Low | 16.0 | $236,977 | about 4.9 a year | 93 |
| Earthquake | Very Low | 8.2 | $11,610 | rarer than once in 1,000 years | — |
| Landslide | Very Low | 3.6 | $6 | about once every 17 years | — |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Hurricane | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | 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 18
Most common: Severe Storm 11, Flood 4, Winter Storm 1, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Flood |
| 1970s | 1 | Severe Ice Storm |
| 1990s | 2 | Severe Storm, Flood |
| 2000s | 4 | Severe Storm ×3, Hurricane |
| 2010s | 6 | Severe Storm ×4, Flood ×2 |
| 2020s | 4 | Severe Storm ×3, Winter Storm |
The last 10
Widest declarations that included Polk County
- Hurricane Katrina Evacuees (2005, EM-3245-NE): 93 Nebraska counties designated.
- Severe Winter Storm, Straight-Line Winds, and Flooding (2019, DR-4420-NE): 84 Nebraska counties designated.
- Severe Storms, Tornadoes, and Flooding (2008, DR-1770-NE): 62 Nebraska 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. Nebraska also had 6 statewide declarations with no county list.
Tornado record since 1950 38
| Tornadoes touching the county | 38 |
|---|---|
| Strongest-rated | (E)F4 ×2 |
| Peak month | May (13) |
| Deadliest | 30 Jul 1968, F2, 6.4 mi path, 0 killed, 2 injured |
| Longest path | 4 Jun 1971, F1, 47.4 mi path |
| Most recent | 14 Aug 2024, unrated |
| Deaths / injuries on those paths | 0 / 4 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 16 | 14 | 2 | 3 | 2 | 0 | 1 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 3 | 6 | 9 | 4 | 2 | 4 | 5 | 5 |
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 Polk County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Polk County (this page) | — | Very Low | 25.7 | Hail |
| York County | 35 km | Relatively Low | 52.3 | Hail |
| Butler County | 37 km | Very Low | 24.5 | Hail |
| Merrick County | 39 km | Relatively Low | 42.9 | Hail |
| Nance County | 42 km | Very Low | 21.7 | Hail |
| Platte County | 43 km | Relatively Low | 70.6 | Hail |
Nearest by distance between county centres. Every county in Nebraska, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 10.6 |
|---|---|
| Community resilience | Relatively High 61.1 |
| Community risk factor | 0.72 |
| Expected annual loss, all hazards | $12 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 Polk County's main hazards
- Right now: National Weather Service alerts for Nebraska · all official warnings on Global Incident Tracker.
- Hail: Weather alerts for Nebraska
- Drought: Drought monitor for Nebraska
- Strong wind: Power outages now
- 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 Polk County
What natural disasters is Polk County, Nebraska most at risk from?
Polk County, Nebraska has a Very Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 25.7 out of 100, higher than about 25% of US counties, with hail, drought and strong winds scoring highest of its 18 hazards and $12 million a year in expected losses.
How many federal disaster declarations has Polk County had?
OpenFEMA lists 18 federal disaster declarations that included Polk County since 1967, not counting 2 for COVID-19; the latest is DR-4868-NE (Severe Winter Storm and Straight-Line Winds, declared 21 May 2025). Another 6 Nebraska declarations were made statewide without a county list.
How many tornadoes have hit Polk County?
NOAA's Storm Prediction Center recorded 38 tornadoes touching Polk County from 1950 to 2025. The deadliest: 30 Jul 1968, F2, 6.4 mi path, 0 killed, 2 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.