Integrated Public Alert & Warning System | FEMA.gov

The Integrated Public Alert & Warning System (IPAWS) is FEMA’s national system for local alerting that provides authenticated emergency and life-saving information to the public through mobile phones using Wireless Emergency Alerts, to radio and television via the Emergency Alert System, and on the National Oceanic and Atmospheric Administration’s Weather Radio.

Source: Integrated Public Alert & Warning System | FEMA.gov