PlainHazard

PlainHazard guide

Understanding FEMA Disaster Data

What a FEMA disaster declaration actually means, how the three declaration types differ, and how NOAA's broader storm-event record complements the federal picture.

The short answer

FEMA disaster declarations are a lagging, policy-filtered view: the federal government's formal response once state resources are overwhelmed. NOAA storm records capture what actually happened on the ground regardless of whether federal aid was ever requested, together the two datasets give the most complete picture of U.S. natural hazard history.

3
declaration types (DR/EM/FM), each unlocking different federal aid
5,218
FEMA disaster declarations in this dataset
681,982
NOAA storm events, broader and unfiltered by federal aid decisions
50-70/yr
declarations now vs. under 20/yr in the 1960s

FEMA disaster data at a glance

5,218
FEMA disaster declarations
681,982
NOAA storm events
3,266
U.S. counties covered

FEMA declarations by incident type

Which hazard categories drive the most federal disaster declarations

declarations

What this shows Severe storms and floods dominate FEMA's declaration record because they recur across many states and seasons; rarer hazards like earthquakes appear far less often.

Source FEMA OpenFEMA Disaster Declarations Summaries v2 As of 2026-08-25

A plain-language guide to what FEMA disaster declarations mean, how they differ from each other, and how NOAA storm records complement the picture.

The Three Types of FEMA Declarations

FEMA's OpenFEMA dataset distinguishes three declaration types, each serving a different purpose and unlocking different categories of federal aid.

Major Disaster Declaration (DR)

The broadest Stafford Act disaster declaration, issued by the President after a state, tribal, or territorial request and FEMA review. A Major Disaster declaration may authorize Individual Assistance, Public Assistance, Hazard Mitigation assistance, or a subset of those programs; the FEMA declaration page lists what was approved for each event. Examples include Hurricane Katrina (2005), Superstorm Sandy (2012), and the 2011 Joplin tornado.

Emergency Declaration (EM)

A narrower authority used for events requiring immediate federal assistance to protect lives and property, or issued pre-emptively before a disaster strikes. Federal cost ceiling is approximately $5 million. Often issued before major hurricanes to pre-position resources. Less comprehensive than a major disaster declaration, it does not automatically unlock Individual Assistance programs for households.

Fire Management Assistance Grant (FM)

Specific to uncontrolled wildfires threatening communities. Can be declared within hours when a fire threatens to cause major damage. Covers only fire suppression costs, no individual or public assistance programs. Western states, particularly California, Oregon, and Washington, receive the most FMAGs annually given regional fire conditions. PlainHazard's hazard data tracks wildfire events from NOAA separately from FEMA fire declarations.

How a Disaster Gets Declared

The process from event to declaration follows a specific sequence. Understanding it helps explain why some devastating events don't result in FEMA declarations and why declaration counts reflect policy as much as disaster severity.

  1. Event occurs - A hurricane, flood, tornado, or other hazard causes damage.
  2. Local and state response - Local governments respond first, then request state emergency assistance.
  3. Preliminary damage assessment - FEMA and state officials jointly assess damage to determine whether federal thresholds are met.
  4. Governor's request - The governor formally requests a presidential disaster declaration.
  5. Presidential decision - The President approves or denies the request based on FEMA's recommendation. Approval rates have historically ranged from 60-75%.

Browse state-level disaster histories to see how many declarations each state has received and what types dominate.

What the NOAA Storm Events Database Captures

NOAA's Storm Events Database is distinct from FEMA data. It records weather events documented by National Weather Service meteorologists, regardless of whether federal aid was requested. This makes it a more complete picture of what actually occurred on the ground.

The database categorizes events into 55+ types covering thunderstorm winds, tornadoes, flash floods, coastal floods, hail, winter storms, blizzards, fog, drought, wildfires, dust storms, and tropical systems. Each record includes:

  • Start and end date/time and location (state, county, coordinates)
  • Direct and indirect fatalities and injuries
  • Property damage and crop damage (in nominal dollars)
  • Narrative description from the NWS office

PlainHazard's hazard type pages let you explore each NOAA event category across all states and counties.

Reading Damage Figures

NOAA damage estimates are reported in nominal dollars by NWS offices at the time of the event, they are not inflation-adjusted and may underestimate true economic losses. Large-scale events like major hurricanes have comprehensive damage estimates; smaller localized events may have rough approximations or be listed as zero if damage was not assessed.

FEMA's public dataset does not include detailed damage cost figures for individual declarations, it focuses on declaration type, affected areas, and program eligibility. Damage cost data from FEMA comes from separate program-level reports not included in PlainHazard's current dataset.

Cross-comparing FEMA, NOAA, and FEMA NRI

The three federal hazard datasets are complementary, not redundant. Researchers using PlainHazard often need to switch between them depending on the question being asked.

FEMA OpenFEMA, federal recognition of severity

OpenFEMA captures only events that crossed the federal-declaration threshold. Use it when the question is about federal aid, Public Assistance projects, or the political-administrative recognition of a disaster.

NOAA Storm Events Database, frequency and intensity

NOAA captures the broader severe-weather signal, including events that did not trigger a federal declaration. Use it when the question is about hazard frequency, climatological trends, or the population of localized events that never reached presidential attention.

FEMA NRI, modeled exposure and vulnerability

The National Risk Index is forward-looking. It combines historical hazard frequency with exposed-asset value, social vulnerability, and community resilience to model annualized loss for each county. Use it when the question is about future risk, modeled exposure (EAL), or pre-disaster planning. PlainHazard does not compute insurance premium or fee pricing from this dataset.

Data Sources

This content is for informational purposes only. Always follow official guidance from local authorities and emergency services.

Use the right dataset for the question

FEMA, NOAA, and FEMA NRI answer three different questions; picking the wrong one is the most common data-literacy mistake in disaster reporting.

Real per-county figures always come from that county's own detail page, not the illustrative worked examples above.

Frequently Asked Questions

What is a FEMA major disaster declaration?

A major disaster declaration (DR) is issued by the President after a state, tribal, or territorial request and FEMA review. It can authorize Individual Assistance, Public Assistance, Hazard Mitigation assistance, or a subset of those programs; FEMA lists the actual authorizations for each declaration separately.

How does an emergency declaration differ from a major disaster declaration?

Emergency declarations (EM) are more limited in scope and can be issued in anticipation of an event or for smaller-scale situations. They primarily fund protective measures and emergency response costs rather than recovery. The federal cost ceiling for emergency declarations is typically $5 million, compared to major disaster declarations which can involve billions in aid. FEMA's dataset includes both types, and PlainHazard lets you filter by declaration type.

What is a Fire Management Assistance Grant (FMAG)?

Fire Management Assistance Grants (FM) help states, local, and tribal governments pay for suppressing uncontrolled fires that threaten communities. Unlike major disaster declarations, FMAGs are focused exclusively on wildfire firefighting costs and are declared much more frequently, often within hours of a fire threatening lives or property. Western states like California receive a disproportionate share of FMAGs given the regional fire environment.

What does NOAA track in the Storm Events Database?

NOAA's Storm Events Database, maintained by the National Centers for Environmental Information (NCEI), records severe weather events reported by the National Weather Service. PlainHazard's 2015–2025 extract covers 681,982 event records across 50+ categories, with fatalities, injuries, and property and crop damage estimates.

Why do some disasters appear in NOAA data but not FEMA data?

NOAA records every qualifying severe weather event regardless of whether federal disaster aid was requested or granted. FEMA declarations require a governor's formal request and a presidential determination that state resources are overwhelmed. Many localized but destructive events, significant hail storms, flash floods affecting a single county, appear in NOAA data without triggering a FEMA declaration. Conversely, FEMA can declare disasters for non-weather events like droughts or chemical releases not in the NOAA storm events database.

Has the frequency of FEMA disaster declarations increased over time?

Annual FEMA Major Disaster declaration totals vary substantially across the 1953–present record. A declaration count reflects both damaging events and the administrative process for requesting and authorizing federal assistance, so the count alone cannot establish why a trend changed or isolate a climate signal.

PlainHazard derives this guide's examples from 5,218 FEMA declaration records and 681,982 NOAA storm events in its current database, refreshed as of 2026-08-25. The agencies publish the source records; they do not endorse PlainHazard's summaries. Read our methodology for how this data is sourced and verified.

Every figure on PlainHazard is rendered directly from FEMA federal disaster data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or national statistics report, the data & editorial changelog, or report a data error.