Henry County, Illinois: Natural Disaster Risk and History
Henry County, Illinois has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 57.1 out of 100, higher than about 57% of US counties, with strong winds, drought and hail scoring highest of its 18 hazards and $24 million a year in expected losses.
OpenFEMA lists 14 federal disaster declarations that included Henry County since 1973, not counting 2 for COVID-19; the latest is DR-4819-IL (Severe Storms, Tornadoes, Straight-Line Winds, and Floodng, declared 20 September 2024). NOAA's Storm Prediction Center recorded 71 tornadoes touching Henry County from 1950 to 2025.
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Population 49,270 Buildings worth $12 billion Area 834 sq mi Risk rank in Illinois 49 of 102 FIPS 17073
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Strong wind | Relatively High | 96.8 | $4.8 million | about 6 a year | 229 |
| Drought | Relatively High | 90.6 | $2.2 million | about 9.1 a year | 231 |
| Hail | Relatively Moderate | 76.9 | $943,299 | about 3.9 a year | 147 |
| Tornado | Relatively Moderate | 70.4 | $3.2 million | about once every 1.3 years | 45 |
| Heat wave | Relatively Low | 70.2 | $1.2 million | about 7 a year | 107 |
| Ice storm | Relatively Moderate | 69.0 | $262,610 | about once every 1.4 years | 48 |
| Winter weather | Relatively Moderate | 64.5 | $133,381 | about 16 a year | 297 |
| Landslide | Relatively Low | 64.4 | $4,646 | about once every 4.6 years | — |
| Cold wave | Relatively Low | 62.1 | $1.9 million | about 5.4 a year | 102 |
| Lightning | Relatively Moderate | 59.6 | $415,561 | about 43 a year | 135,835 strikes |
| Earthquake | Very Low | 58.1 | $518,908 | about once every 769 years | — |
| Inland flooding | Relatively Low | 51.5 | $8.8 million | about 1.8 a year | 50 |
| Hurricane | Very Low | 19.3 | $7,002 | about once every 112 years | 0 |
| Wildfire | Very Low | 7.1 | $2,799 | rarer than once in 1,000 years | — |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | 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 14
Most common: Flood 6, Snowstorm 5, Severe Storm 2, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 3 | Flood ×2, Snowstorm |
| 1990s | 4 | Severe Storm ×2, Snowstorm, Flood |
| 2000s | 3 | Snowstorm ×2, Hurricane |
| 2010s | 3 | Flood ×2, Snowstorm |
| 2020s | 1 | Flood |
The last 10
Widest declarations that included Henry County
- Hurricane Katrina Evacuation (2005, EM-3230-IL): 102 Illinois counties designated.
- Severe Winter Storm and Snowstorm (2011, DR-1960-IL): 65 Illinois counties designated.
- Il-Winter Storm 1/1/99 (1999, EM-3134-IL): 52 Illinois 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. Illinois also had 2 statewide declarations with no county list.
Tornado record since 1950 71
| Tornadoes touching the county | 71 |
|---|---|
| Strongest-rated | (E)F2 ×17 |
| Peak month | April (25) |
| Deadliest | 19 Apr 1996, F1, 3.5 mi path, 0 killed, 4 injured |
| Longest path | 21 Apr 1973, F2, 30.2 mi path, 0 killed, 2 injured |
| Most recent | 20 Apr 2025, EF0, 2.2 mi path |
| Deaths / injuries on those paths | 0 / 8 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 26 | 24 | 17 | 0 | 0 | 0 | 4 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 2 | 8 | 11 | 2 | 8 | 7 | 8 | 25 |
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 Henry County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Henry County (this page) | — | Relatively Low | 57.1 | Strong wind |
| Rock Island County | 38 km | Relatively Moderate | 84.1 | Cold wave |
| Stark County | 40 km | Very Low | 7.3 | Drought |
| Knox County | 47 km | Relatively Low | 57.2 | Strong wind |
| Whiteside County | 48 km | Relatively Low | 65.8 | Drought |
| Bureau County | 51 km | Relatively Low | 62.3 | Drought |
Nearest by distance between county centres. Every county in Illinois, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 14.8 |
|---|---|
| Community resilience | Very High 83.8 |
| Community risk factor | 0.83 |
| Expected annual loss, all hazards | $24 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 Henry County's main hazards
- Right now: National Weather Service alerts for Illinois · all official warnings on Global Incident Tracker.
- Strong wind: Power outages now
- Drought: Drought monitor for Illinois
- Hail: Weather alerts for Illinois
- 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 Henry County
What natural disasters is Henry County, Illinois most at risk from?
Henry County, Illinois has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 57.1 out of 100, higher than about 57% of US counties, with strong winds, drought and hail scoring highest of its 18 hazards and $24 million a year in expected losses.
How many federal disaster declarations has Henry County had?
OpenFEMA lists 14 federal disaster declarations that included Henry County since 1973, not counting 2 for COVID-19; the latest is DR-4819-IL (Severe Storms, Tornadoes, Straight-Line Winds, and Floodng, declared 20 September 2024). Another 2 Illinois declarations were made statewide without a county list.
How many tornadoes have hit Henry County?
NOAA's Storm Prediction Center recorded 71 tornadoes touching Henry County from 1950 to 2025. The deadliest: 19 Apr 1996, F1, 3.5 mi path, 0 killed, 4 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.