Johnson County, Kansas: Natural Disaster Risk and History
Johnson County, Kansas has a Relatively High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 94.8 out of 100, higher than about 94% of US counties, with winter storms, tornadoes and hail scoring highest of its 18 hazards and $257 million a year in expected losses.
OpenFEMA lists 10 federal disaster declarations that included Johnson County since 1969, not counting 2 for COVID-19; the latest is DR-4747-KS (Severe Storms, Straight-Line Winds, Tornadoes, and Flooding, declared 26 October 2023). NOAA's Storm Prediction Center recorded 47 tornadoes touching Johnson County from 1950 to 2025.
Live weather alerts for Kansas All official warnings Latest FEMA declarations
Population 609,569 Buildings worth $159 billion Area 485 sq mi Risk rank in Kansas 2 of 105 FIPS 20091
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Winter weather | Very High | 100.0 | $6.0 million | about 11 a year | 214 |
| Tornado | Very High | 98.9 | $55 million | about once every 3.1 years | 29 |
| Hail | Relatively High | 98.9 | $15 million | about 9.2 a year | 351 |
| Ice storm | Very High | 98.7 | $5.2 million | about once a year | 67 |
| Heat wave | Relatively High | 98.4 | $27 million | about 15 a year | 169 |
| Lightning | Very High | 98.4 | $5.1 million | about 52 a year | 448,917 strikes |
| Cold wave | Relatively High | 98.0 | $31 million | about 2.3 a year | 43 |
| Inland flooding | Relatively High | 94.9 | $110 million | about 2.5 a year | 71 |
| Earthquake | Relatively Low | 75.7 | $1.8 million | about once every 1,000 years | — |
| Landslide | Relatively Low | 69.0 | $8,032 | about once every 7.9 years | — |
| Wildfire | Very Low | 61.2 | $137,636 | rarer than once in 1,000 years | — |
| Strong wind | Relatively Low | 47.1 | $758,396 | about 7 a year | 266 |
| Drought | Very Low | 24.9 | $18,044 | about 6.2 a year | 343 |
| Hurricane | No Rating | 0.0 | — | — | 0 |
| 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 10
Most common: Severe Storm 5, Flood 2, Hurricane 1, Severe Ice Storm 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1960s | 1 | Tornado |
| 1970s | 1 | Flood |
| 1990s | 3 | Severe Storm ×2, Flood |
| 2000s | 3 | Severe Storm, Hurricane, Severe Ice Storm |
| 2010s | 1 | Severe Storm |
| 2020s | 1 | Severe Storm |
The last 10
Widest declarations that included Johnson County
- Severe Winter Storms (2007, EM-3282-KS): 105 Kansas counties designated.
- Hurricane Katrina Evacuation (2005, EM-3236-KS): 105 Kansas counties designated.
- Severe Storms & Flooding (1993, DR-1000-KS): 57 Kansas 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. Kansas also had 4 statewide declarations with no county list.
Tornado record since 1950 47
| Tornadoes touching the county | 47 |
|---|---|
| Strongest-rated | (E)F4 ×1 |
| Peak month | May (19) |
| Deadliest | 19 Apr 1966, F3, 7.7 mi path, 0 killed, 4 injured |
| Longest path | 4 May 1977, F3, 31.6 mi path, 0 killed, 1 injured |
| Most recent | 19 May 2024, EF1, 0.9 mi path |
| Deaths / injuries on those paths | 0 / 17 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 23 | 15 | 6 | 2 | 1 | 0 | 0 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 8 | 8 | 6 | 5 | 3 | 4 | 9 | 4 |
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 Johnson County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Johnson County (this page) | — | Relatively High | 94.8 | Winter weather |
| Wyandotte County | 26 km | Relatively Moderate | 89.4 | Strong wind |
| Miami County | 36 km | Relatively Low | 43.1 | Winter weather |
| Leavenworth County | 40 km | Relatively Low | 66.3 | Heat wave |
| Douglas County | 41 km | Relatively Low | 74.8 | Winter weather |
| Jackson County, MO | 43 km | Relatively High | 96.5 | Tornado |
Nearest by distance between county centres. Every county in Kansas, ranked.
Vulnerability and resilience
| Social vulnerability | Very Low 10.6 |
|---|---|
| Community resilience | Relatively High 75.3 |
| Community risk factor | 0.69 |
| Expected annual loss, all hazards | $257 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 Johnson County's main hazards
- Right now: National Weather Service alerts for Kansas · all official warnings on Global Incident Tracker.
- Winter weather: Power outages now · Carbon monoxide in winter
- Tornado: Is there a tornado warning now?
- Hail: Weather alerts for Kansas
- 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 Johnson County
What natural disasters is Johnson County, Kansas most at risk from?
Johnson County, Kansas has a Relatively High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 94.8 out of 100, higher than about 94% of US counties, with winter storms, tornadoes and hail scoring highest of its 18 hazards and $257 million a year in expected losses.
How many federal disaster declarations has Johnson County had?
OpenFEMA lists 10 federal disaster declarations that included Johnson County since 1969, not counting 2 for COVID-19; the latest is DR-4747-KS (Severe Storms, Straight-Line Winds, Tornadoes, and Flooding, declared 26 October 2023). Another 4 Kansas declarations were made statewide without a county list.
How many tornadoes have hit Johnson County?
NOAA's Storm Prediction Center recorded 47 tornadoes touching Johnson County from 1950 to 2025. The deadliest: 19 Apr 1966, F3, 7.7 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.