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.

Compiled by PlainHazard Editorial, Natural Hazards Editorial Team · July 20, 2026

FEMA disaster data at a glance

1,132
FEMA disaster declarations: 835,622
NOAA storm events: 2,791
U.S. counties covered

Fire

668
Severe Storm

157
Flood

90
Hurricane

65
Tropical Storm

39
Winter Storm

36
Biological

17
Severe Ice Storm

13

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.

PlainHazard Editorial Published March 14, 2026 Updated July 6, 2026

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 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: 1,132
FEMA disaster declarations in this dataset: 835,622
NOAA storm events, broader and unfiltered by federal aid decisions: 50-70/yr
declarations now vs. under 20/yr in the 1960s

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 most comprehensive federal disaster response tool, authorized under the Stafford Act. Triggered by presidential approval of a governor's request after an event causes damage exceeding state and local capacity. Unlocks Individual Assistance (housing, medical, crisis counseling), Public Assistance (infrastructure repair), and Hazard Mitigation grants. 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.

Event occurs - A hurricane, flood, tornado, or other hazard causes damage.
Local and state response - Local governments respond first, then request state emergency assistance.
Preliminary damage assessment - FEMA and state officials jointly assess damage to determine whether federal thresholds are met.
Governor's request - The governor formally requests a presidential disaster declaration.
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, insurance pricing, or pre-disaster planning.

Worked example: a Florida coastal county

A typical Florida coastal county might show this pattern across the three datasets:

Dataset	Records	Loss / EAL	Question it answers
FEMA OpenFEMA	12 declarations	$420M PA obligated	Federal recognition
NOAA Storm Events	2,341 events	$890M nominal damage	Hazard frequency
FEMA NRI	18 hazards modeled	$78M EAL/year	Forward exposure

In this scenario, the county shows estimated $420M in federal Public Assistance obligated against $890M in nominal NOAA-reported damage and a modeled $78M EAL per year, the gap between $420M federal aid and $890M total damage represents uninsured and self-insured losses, while the EAL is what FEMA NRI expects in any given future year.

Data Sources

FEMA OpenFEMA: Disaster Declarations Summaries v2 - all federal disaster declarations since 1973.
NOAA NCEI: Storm Events Database - severe weather event records maintained by the National Weather Service.

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.

PlainHazard tracks 1,132 FEMA declarations across 2,791 counties, use this for federal recognition history. Browse states
835,622 NOAA storm events capture hazard frequency FEMA never declared. Browse counties
See how a specific hazard type compares across the whole country. Explore hazard types
Turn dataset literacy into a regional risk picture. Hazard risk by region

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 following a governor's request when a disaster overwhelms state and local resources. It unlocks the widest range of federal assistance programs, including Individual Assistance for households and Public Assistance for rebuilding infrastructure. Major disaster declarations are the most common type in the FEMA dataset, representing events like hurricanes, floods, tornadoes, and severe winter storms.

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. It includes 55+ event types such as tornadoes, thunderstorm winds, flash floods, hail, winter storms, and tropical cyclones. Each record includes location, start/end times, fatalities, injuries, and property and crop damage estimates. PlainHazard covers 690,000+ events from 2015 through 2025.

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?

Yes, the number of annual FEMA major disaster declarations has grown substantially since 1973. In the 1960s, fewer than 20 declarations were issued per year nationally. By the 2010s and 2020s, that number routinely exceeds 50-70 per year. Researchers attribute this trend to a combination of factors: increased development in hazard-prone areas, better event detection and documentation, population growth in coastal and flood-prone zones, and changes in the political and administrative processes around disaster requests.

According to the Federal Emergency Management Agency, this guide is grounded in 1,132 FEMA disaster declarations and 835,622 NOAA storm events, refreshed as of 2026-07-20. Read our methodology for how this data is sourced and verified.