CAP Weather Alert API

Access Restriction

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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 focuses on the United States.

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.