DisasterAtlasUSA

This is a record of past federal disaster declarations, not a forecast. Federal assistance figures are aid obligated under specific programs, not total damages. For current threats, check the National Weather Service and FEMA.

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Glossary

Plain-language definitions of the terms used across DisasterAtlasUSA.

Federal disaster declaration
A formal decision by the U.S. president, at a governor's request, that an event is beyond state and local capacity and unlocks federal assistance. This site counts declarations — the official response threshold being crossed — not every storm or fire.
DR, EM and FM
DR = Major Disaster Declaration (the broadest, for events like hurricanes and major floods). EM = Emergency Declaration (a narrower, faster form). FM = Fire Management Assistance (for wildfires threatening destruction). Each carries different programs.
Incident type
FEMA's category for what caused the declaration — Hurricane, Flood, Severe Storm, Fire, Tornado, Winter Storm, Earthquake, Drought, and others. We group related types into hazard pages.
Individual Assistance (IA)
FEMA aid to households and individuals — grants for temporary housing and repairs, and other services. "IA declared" means this help was made available, not how much was paid.
Public Assistance (PA)
FEMA reimbursement to state, local and tribal governments (and some nonprofits) for debris removal, emergency response and rebuilding public infrastructure.
Hazard Mitigation (HM)
Funding to reduce future risk after a disaster — buyouts of flood-prone homes, stronger building standards, drainage projects. It is forward-looking, unlike IA and PA.
Designated area
A county (or equivalent) named in a declaration as eligible for assistance. One disaster usually covers many counties; on a county page, each row is one declaration that named that county.
Aid is not damages
Assistance figures are federal money obligated under specific programs. Total economic loss from an event is a separate, usually much larger figure, measured differently, and is not shown here.
History, not a forecast
A count of past declarations tells you what has happened in a place, not what will. For current threats, the authoritative sources are the National Weather Service and FEMA.
OpenFEMA
FEMA's open-data program, which publishes the Disaster Declarations Summaries dataset this site is built on — every declaration back to 1953.

More on sources on the About the Data page and the FAQ.