FEMA Records
20
Above median
Tennessee · FEMA + NOAA + National Risk Index
Johnson County, TN
20 FEMA disaster declarations (1973-2026), with a FEMA National Risk Index rating of Very Low. Most common hazard: Severe Storm.
- 20
- FEMA declarations
- 14
- Major disasters
- 28
- NRI risk · Very Low
- Severe Storm
- Top hazard
The verdict
Johnson County has a nationally busy FEMA history: 20 declarations, more than 46% of counties in this registry. But the state comparison tempers that reading: the total is 7% below the Tennessee county mean. FEMA's separate National Risk Index places the county safer than 28%; that score models loss and vulnerability rather than counting declarations.
- Safer than 28%
- of U.S. counties for FEMA National Risk Index score
- Very Low
- FEMA National Risk Index rating
- 20
- FEMA declarations vs 21 national county avg
- 51
- NFIP flood insurance claims filed
FEMA's National Risk Index and its declaration registry are separate measures. This county's registry includes Major Disaster (DR) and Emergency (EM) records; an EM authorizes a narrower set of federal assistance than a DR.
FEMA OpenFEMA declaration desk
County FIPS 47091 · Johnson County 20 declarations · rank 1729/3,266
DECL-HEAVY · MAJOR-MID · RANK-LOWER · PHOTO-FINISH · NRI-LOW · ACT-HIGH · TYPE-LEAD · VS-ST-BELOW
- DECL-HEAVY 20
- MAJOR-MID 70%
- RANK-LOWER #1,729
- PHOTO-FINISH Monona
- NRI-LOW Very Low
- ACT-HIGH High
- TYPE-LEAD Severe Storm
- VS-ST-BELOW -7%
Nearest declaration peer: Monona, IA (0 declaration gap)
FEMA Disaster Declarations Summaries v2 filing stamps for this county register. Read with this county → · Tennessee state profile
Johnson County in the declaration-count neighbourhood
FEMA declaration records among Johnson County and nearest peers by total count
- Los Angeles · largest
Los Angeles · largest
88 declarations
- Cleveland · near 20
Cleveland · near
20 declarations
- Johnson · this county 20
Johnson · this county
20 declarations
- Monona · near 20
Monona · near
20 declarations
- Tallapoosa · near 20
Tallapoosa · near
20 declarations
- Ujelang · smallest 1
Ujelang · smallest
1 declarations
What this shows Johnson County carries 20 FEMA declaration records, ranked 1729 of 3,266 counties in this registry.
How Johnson County's FEMA declaration count compares nationally
Johnson County vs. all counties in this dataset
FEMA disaster declarations, all-time · Johnson County
20 46th percentile higher than 46% of 3,266 counties
Each bar is a band; taller bars hold more counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source FEMA Disaster Declarations Summaries v2 · 2026-08-25
Johnson County's FEMA Risk Index score
Which hazard drives modeled loss here?
FEMA's modeled annual dollar loss for Johnson County is led by Riverine Flooding (about $3.8M Expected Annual Loss, Historical Loss Ratio Relatively Moderate), while Landslide carries the highest National Risk Index rating (Relatively Moderate). EAL and risk score use different inputs; they need not agree.
Source: FEMA National Risk Index (December 2025 release) - Expected Annual Loss vs composite risk rating by hazard.
What does Johnson County's hazard record show?
Reading the federal records together
The NFIP claims register shows a middle-volume loss record here: 51 paid claims, totaling $2.2M. PlainHazard uses 50-499 claims for this descriptive band; FEMA does not publish it as a safety or coverage category. The $43.7K average describes payments on recorded claims only, leaving uninsured damage and properties without a claim outside the measure.
Start with the state benchmark: a Tennessee county averages 21.4 federal declaration records, while Johnson County has 20. The gap is 7% below that mean. Fewer entries indicate a quieter history of recorded federal actions, not immunity from a hazard and not a prediction about what happens next.
FEMA National Risk Index
This county's FEMA National Risk Index composite lands at 28.2/100 (Very Low), a modest reading against the rest of the country. Expected Annual Loss is rated Very Low (roughly $5.9M in annualized losses), tempered or compounded by a Very High social-vulnerability score and Very Low community-resilience score. Among the 18 modeled hazards, Landslide carries the county's highest rating, a mid-range Relatively Moderate. FEMA's modeled frequency puts that hazard at roughly once every 1 years here.
64 /100
Historical Activity Index
High historical activity
Johnson County, TN · PlainHazard-derived composite from federal records
This 0–100 index is an explicit PlainHazard composite from FEMA declaration history only on the county surface (this DB has no county-level NOAA damage row) . It is not FEMA's National Risk Index, not a forecast, and not a safety, insurance, or preparedness rating. Open the calculator · Methodology
FEMA Declarations (1953–present) Moderate
14/30
20 OpenFEMA declarations, full ingest window (1.0x national county average)
County Disaster Density Moderate
12/25
20 declarations (0.9x state county average of 21)
Major Disaster Share High
18/25
14 of 20 declarations are major disasters (70%)
Hazard Diversity Very High
20/20
8 different disaster types declared in Johnson County
FEMA NRI 8-hazard radar - Johnson County
How to read this radar
Each axis: NRI risk rating (Very Low-Very High) on a 0-100 scale. Rounder = broad exposure; spiky = one or two hazards dominate.
Major Disaster share
70%
Major-heavy
NRI risk score
28
Very Low
Source: FEMA National Risk Index Per-county per-hazard ratings, December 2025 release
How often does each hazard strike Johnson County?
FEMA's National Risk Index models a historical event count and an annualized frequency for each hazard type. Most hazards are expressed as modeled occurrences per year; FEMA expresses drought and heat-wave frequency as event-days per year. These modeled frequencies are not forecasts.
| Hazard | NRI Risk Rating | Recurrence |
|---|---|---|
| Landslide | Relatively Moderate | roughly once every 1 years |
| Cold Wave | Relatively Low | an average of 3.3 times per year |
| Wildfire | Very Low | roughly once every 398 years |
| Hurricane | Very Low | roughly once every 43 years |
| Lightning | Relatively Low | an average of 49 times per year |
| Drought | Relatively Low | 22 modeled event-days per year |
| Riverine Flooding | Relatively Low | roughly once every 1 years |
| Earthquake | Very Low | roughly once every 634 years |
| Ice Storm | Relatively Low | roughly once every 3 years |
| Strong Wind | Relatively Low | an average of 2.7 times per year |
| Winter Weather | Relatively Low | an average of 17 times per year |
| Tornado | Very Low | roughly once every 18 years |
| Hail | Very Low | an average of 3.5 times per year |
| Heat Wave | Very Low | 0 modeled event-days per year |
Source: FEMA National Risk Index Modeled annualized frequency; drought and heat wave use event-days/year, December 2025 release
Disaster Types
Severe Storm 7
Flood 4
Winter Storm 2
Tropical Storm 2
Biological 2
Hurricane 1
Snowstorm 1
Tornado 1
What Severe Storm declarations mean here
Severe Storm is the most frequent declaration type on Johnson County's record, 35% of its declarations. In FEMA's vocabulary this covers convective weather: thunderstorm straight-line winds, large hail, and the multi-day outbreaks that often carry embedded tornadoes. Activity is heaviest in spring and summer, though the season varies by region.
These events behave differently from a hurricane on paper. Damage tends to be distributed along a storm track rather than concentrated on a coastline, and a declaration typically follows an outbreak that crossed several counties over a few days, not a single point of impact. Because the qualifying threshold is the cost of uninsured public and individual losses rather than storm intensity, two similar storms can produce a declaration in one year and none in another.
Declaration counts describe past federal action. They are a record of what was declared, not a forecast of future hazard probability.
Declaration Types
What DR / EM / FM mean
FEMA categorizes declarations as Major Disasters (DR), Emergencies (EM), or Fire Management Assistance (FM).
Major Disaster - 14 70.0%
of all 20 declarations
Emergency - 6 30.0%
of all 20 declarations
FEMA Declarations Timeline
| Year | Declarations | |
|---|---|---|
| 2026 | 2 | |
| 2025 | 2 | |
| 2024 | 1 | |
| 2023 | 1 | |
| 2020 | 2 | |
| 2019 | 1 | |
| 2011 | 1 | |
| 2005 | 2 | |
| 2003 | 1 | |
| 2001 | 1 | |
| 1998 | 1 | |
| 1994 | 1 | |
| 1993 | 1 | |
| 1978 | 1 | |
| 1974 | 1 | |
Show 1 earlier declaration years
| 1973 | 1 | |
Disaster Declarations
How the 20 FEMA declarations break into federal action codes (DR / EM / FM). Same DISTINCT grain as the table below.
Download these 20 declarations as CSV . FEMA source data is public domain; our derived presentation is CC0.
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 4898 | SEVERE WINTER STORM | DR | Winter Storm | 2026-02-06 |
| 3635 | SEVERE WINTER STORM | EM | Winter Storm | 2026-01-24 |
| 3625 | SEVERE STORMS, STRAIGHT-LINE WINDS, TORNADOES, AND FLOODING | EM | Severe Storm | 2025-04-02 |
| 4832 | TROPICAL STORM HELENE | DR | Tropical Storm | 2024-10-02 |
| 3620 | TROPICAL STORM HELENE | EM | Tropical Storm | 2024-09-27 |
| 4701 | SEVERE STORMS, STRAIGHT-LINE WINDS, AND TORNADOES | DR | Severe Storm | 2023-04-07 |
| 4514 | COVID-19 PANDEMIC | DR | Biological | 2020-04-02 |
| 3473 | COVID-19 | EM | Biological | 2020-03-13 |
| 4427 | SEVERE STORMS, FLOODING, LANDSLIDES, AND MUDSLIDES | DR | Flood | 2019-04-17 |
| 1974 | SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS, AND ASSOCIATED FLOODING | DR | Severe Storm | 2011-05-01 |
| 3217 | HURRICANE KATRINA EVACUATION | EM | Hurricane | 2005-09-05 |
| 1568 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2004-10-07 |
| 1456 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2003-03-20 |
| 1387 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2001-08-15 |
| 1197 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 1998-01-13 |
| 1022 | EXTENSIVE RAINFALL AND FLASH FLOODING | DR | Flood | 1994-04-14 |
| 3095 | SEVERE SNOWFALL, WINTER STORM | EM | Snowstorm | 1993-03-14 |
| 544 | SEVERE STORMS & FLOODING | DR | Flood | 1977-11-12 |
| 424 | TORNADOES | DR | Tornado | 1974-04-04 |
| 366 | HEAVY RAINS & FLOODING | DR | Flood | 1973-03-21 |
Storm Events in Tennessee
Statewide NOAA context only. PlainHazard does not currently attribute these state totals to Johnson County.
| Storm Type | Events | Fatalities | Injuries | Property Damage |
|---|---|---|---|---|
| Thunderstorm Wind | 6,558 | 22 | 58 | $107.0M |
| Hail | 1,690 | 0 | 0 | $545.5K |
| Heat | 1,343 | 9 | 15 | $0 |
| Flash Flood | 1,264 | 55 | 3 | $334.4M |
| Winter Weather | 1,088 | 5 | 0 | $261.0K |
Source: NOAA Storm Events Database State-level aggregated data, 2015-2025
NFIP Flood Insurance Claims
Total Claims
51
Total Paid
$2.2M
Avg Per Claim
$43.7K
Source: FEMA National Flood Insurance Program (NFIP) OpenFEMA Claims Data
FEMA National Risk Index
Overall Risk
Very Low
Score: 28.2/100
Expected Annual Loss
Very Low
$5.9M/year
Social Vulnerability
Very High
Community Resilience
Very Low
Hazard Risk Breakdown
Landslide Relatively Moderate
Cold Wave Relatively Low
Wildfire Very Low
Hurricane Very Low
Lightning Relatively Low
Drought Relatively Low
Riverine Flooding Relatively Low
Earthquake Very Low
Ice Storm Relatively Low
Strong Wind Relatively Low
Winter Weather Relatively Low
Tornado Very Low
Hail Very Low
Heat Wave Very Low
Source: FEMA National Risk Index (NRI) Ratings reflect relative scores among all US counties. Data: hazards.fema.gov/nri
The model's sharpest exposure here: Landslide
Landslide risk is a function of slope, soil and water, so it is usually a SECOND-ORDER hazard: it is triggered by the rainfall, snowmelt, wildfire burn scars or seismic shaking that came first. That is why a county can carry high landslide exposure whose realized damage is recorded under a flood or storm declaration instead.
Worth noting for Johnson County: the model and the federal record do NOT point at the same hazard. Landslide carries the highest modeled rating (Relatively Moderate), while the county's declaration history is led by Severe Storm. That is not a contradiction, the two measure genuinely different things. Declarations record federal ACTION, which requires damage costly enough to exceed state and local capacity; the Risk Index models EXPECTED annual loss across all 18 hazards whether or not any declaration ever followed. A hazard can be the county's largest modeled exposure and never once have driven a declaration.
National Risk Index ratings are modeled estimates of expected annual loss, not predictions of what will happen in any given year.
Data-matched county comparisons
Johnson County's closest FEMA peer: Sussex County, DE
Comparisons use published FEMA declaration fields plus the National Risk Index composite for Johnson County. Record similarity, not a safety rating.
Closest declaration profiles
Johnson County shows 20 FEMA declarations, led by Severe Storm.
Similar Major-disaster share
Johnson County: 14 of 20 of its declarations are Major.
Similar modeled NRI score
Johnson County: NRI composite 28.2 (Very Low).
How these peers are chosen
Cohort: Published U.S. county equivalents outside the source state or territory. Each metric keeps six ETL candidates; three unique destinations are shown after de-duplicating across axes. Declaration-volume ranking combines count and Major-disaster share and prefers a different leading incident type; Major-share ranks the Major fraction adjusted for volume; NRI ranks the modeled composite score only.
Retained FEMA snapshot feed for Johnson County - capture-dated entries only.
Compare beyond this state
Nationwide peers by NRI score & FEMA declaration volume
Two PlainHazard-derived comparison paths for Johnson County: nearest out-of-state National Risk Index composite and nearest FEMA declaration count (floor ≥5 records). Record similarity only, not a forecast of the next hazard.
Similar NRI composite
Nearest out-of-state counties by FEMA NRI score. This county: 28.2 (Very Low).
Similar declaration volume
Nearest out-of-state counties by FEMA declaration count. This county: 20. NRI peers are excluded so the two link sets stay distinct.
Further reading for this county
Understanding disaster data
Johnson County's NFIP claims file (51 claims) and FEMA declaration history measure different federal records - this guide separates them from modeled NRI risk.
More PlainHazard guides
- Most disaster-prone counties - U.S. counties ranked by FEMA declaration totals.
- Understanding disaster data - declarations vs storm events vs NRI scores.
- Preparing for natural disasters - household checklist (not county-specific advice).
Frequently Asked Questions
What is the most common disaster type in Johnson County?
The most common disaster type in Johnson County is Severe Storm, with 7 declarations. Other disaster types include Flood (4), Winter Storm (2), Tropical Storm (2).
How does Johnson County's FEMA declaration record compare with the Tennessee average?
The typical Tennessee county has 21.4 FEMA declaration records; Johnson County has 20, or 7% fewer. Against the national county mean of 20.7, this county's total is 3% lower. The comparison is historical and says nothing about the probability of a future event.
How many major FEMA disaster declarations has Johnson County received?
Johnson County has received 14 major disaster declarations, representing 70% of all 20 disaster declarations.
How many flood insurance claims has Johnson County filed?
Johnson County has 51 National Flood Insurance Program (NFIP) claims totaling $2.2M in payments, with an average of $43.7K per claim.
Does FEMA's top risk-rated hazard match the highest Expected Annual Loss in Johnson County?
No. In Johnson County, Landslide has the highest National Risk Index rating (Relatively Moderate), while Riverine Flooding leads Expected Annual Loss at about $3.8M. FEMA's risk score and dollar-loss model use different inputs, so the leaders often differ.
What was the worst year for disasters in Johnson County?
The most active year for disaster declarations in Johnson County was 2005, with 2 declarations. The county has FEMA disaster data spanning 1973 to 2026.
What is the FEMA National Risk Index score for Johnson County?
According to the FEMA National Risk Index, Johnson County, Tennessee has an overall risk score of 28.2 out of 100 (Very Low). Social vulnerability here rates Very High, while community resilience comes in at Very Low. The Expected Annual Loss (EAL) score is Very Low, representing $5.9M in annualized losses.
Which natural hazard poses the greatest risk to Johnson County?
Based on FEMA NRI data, the highest-risk natural hazard in Johnson County as of the latest release is Landslide (risk rating: Relatively Moderate). Other significant hazards include Cold Wave (Relatively Low) and Wildfire (Very Low). FEMA's modeled event frequency puts landslide here at roughly once every 1 years. FEMA derives these ratings from historical event frequency, the assets exposed, and the community's vulnerability profile.
Data Sources & Methodology
Disaster declaration data comes from the FEMA OpenFEMA Disaster Declarations Summaries v2 API, which includes all federally declared disasters, emergencies, and fire management assistance grants.
Storm event data is sourced from the NOAA Storm Events Database (2015-2025), which tracks significant weather events including thunderstorms, tornadoes, floods, and winter storms.
Flood insurance data comes from the FEMA National Flood Insurance Program (NFIP) OpenFEMA claims dataset.
This data is provided for informational purposes only. FEMA disaster declarations represent federal response actions and may not capture all local emergencies or weather events.
FEMA OpenFEMA declarations + NRI for Johnson County · vintage 2026-08-25 · Methodology · Tennessee profile · Verify with FEMA OpenFEMA · Verify with NOAA Storm Events