On Wednesday, August 11, 2021 FEMA will test its Emergency Alert System as well as the Wireless Emergency Alerts system. It will happen at 2:20 ET.
The Federal Emergency Management Agency, or FEMA, runs the test every year or two to ensure the system is working properly. It’s no small task: A national emergency alert system that can broadcast a message to potentially hundreds of millions of people at any given time is fraught with technological hurdles that require close co-operation from the cell carriers and broadcast networks.
On the iPhone you can see if you have these alerts enabled in Settings > Notifications, and scrolling down to the bottom.
Check It Out: FEMA to Test Emergency Alert System on August 11, 2021