Skip to main content
U.S. flag

An official website of the United States government

Severe Weather Data Inventory

The Severe Weather Data Inventory (SWDI) is an integrated database of U.S. severe weather records that provides access to data from a variety of sources in the NCEI archive. SWDI includes multiple search and access methods for records that cover particular time periods and geographic regions. Data are currently available in Shapefile (for GIS), KMZ (for Google Earth), CSV (comma-separated), and XML formats.

Access Methods

Interactive Map 

Use the interactive map to search and download data for specific locations and time-frames. 

Launch Interactive Map

Bulk Download

Download the entire SWDI database (CSV) via HTTP.

Database Folder

Web Services

Use SWDI web services to automate queries, or integrate data into your own application.

REST Documentation

Quality Control Disclaimer

SWDI provides a uniform way to access data from a variety of sources, but it does not provide any additional quality control beyond the processing that takes place during data archival. The data sources in SWDI will not provide complete severe weather coverage of a geographic region or time period due to a number of factors (e.g., reports for a location or time period not provided to NOAA). The absence of SWDI data for a particular location and time doesn't mean that no severe weather occurred within those parameters. Much of the automatically derived data in SWDI is from radar data that represents probable conditions for an event rather than a confirmed occurrence.

Interface Control Document for Product Specification

Dataset Documentation