Integrated Public Alert and Warning System

The Integrated Public Alert and Warning System (IPAWS) is the primary public warning system of the United States, implemented as a platform that unifies the Emergency Alert System, National Warning System, Wireless Emergency Alerts, and NOAA Weather Radio under a single architecture. IPAWS was designed to modernize these systems by enabling alerts to be aggregated over a network and distributed to the appropriate system for public dissemination concurrently.

Source: Wikipedia — Integrated Public Alert and Warning System (CC BY-SA 4.0)