About
NYC Hazard Historian assembles the public record of hazard events in New York City, from federal and city sources, and shows every figure with its source, its period and its status.
This is an experimental project, not an official one. It has no standing, it can be wrong, and no agency has checked it. For anything authoritative, use NYC Emergency Management and its own Hazard History and Consequence Tool.
Not affiliated
This is an independent project. It is not affiliated with, endorsed by, sponsored by or produced by New York City Emergency Management or the City of New York. No agency reviewed it. Agency names appear here only as factual attribution for the data they publish.
New York City Emergency Management publishes its own Hazard History and Consequence Tool. This site is a separate reconstruction built from the same underlying public sources, and it does not depend on that tool being available.
Who it is for
Anyone who wants to know what has happened to this city and what was recorded about it. It is built to hold up for people who do this professionally, in emergency management, government and climate work, and for anyone building things with civic data, but nothing here assumes you have read a storm report before.
What it will not do
- It does not rank events. The record does not support a ranking and one would be an editorial claim dressed as a measurement. Federal assistance is the sharpest case: it is obligated against a declaration, one declaration can cover fourteen events here, and no page sorts events by it.
- It does not answer questions in natural language. A filter you can see and undo is more trustworthy than a sentence that guesses at your meaning.
- It does not fill gaps. Where the public record stops, the site says so and stops with it.
- It does not estimate, interpolate or repair a source value. Where a published figure looks wrong, it is shown as published and flagged.
Corrections
If a figure here disagrees with a source you trust, the source is the thing to check first, and the site names its own so you can. Errors in the processing are this project's fault and worth reporting through the repository.
Credit
Data from the National Oceanic and Atmospheric Administration, the National Weather Service, the National Hurricane Center, the Federal Emergency Management Agency, the Bureau of Labor Statistics, the Environmental Protection Agency, NYC Open Data and the Iowa Environmental Mesonet at Iowa State University. Each one is listed with its grain, its coverage and its caveat on the method page.
Built with Python, MapLibre GL, CARTO basemaps and Claude. Part of Public Works NYC, alongside The Pay Gap and Schools Finder.
Code is released under the BSD 3-Clause licence. The compiled data is free to reuse with attribution. The underlying data carries the terms of the agencies that publish it.