CAP Weather Alert API

Access Restriction

This API is a premium service not available with free credits. Please upgrade to a paid plan for data access.

API List

• Location API - Query CAP weather alerts for a specified coordinate
• Bulk API - Query CAP weather alerts for a specified region and return a GeoJSON download URL

Coverage and Data Granularity

The CAP Weather Alert API provides warning data published in Common Alerting Protocol (CAP) format. It currently supports the United States and Canada.

Region	Source	Bulk region_code	Text Languages
United States	US National Weather Service	US	en-US
Canada	Environment and Climate Change Canada	CA	en-CA, fr-CA

The location endpoint determines the region from the requested coordinates; it does not accept region_code.

Unlike the standard alert API, the CAP Weather Alert API returns the original CAP event model. A single alert may contain multiple affected areas in the areas field; the bulk endpoint returns a GeoJSON download URL, and the downloaded file expands those areas into features.