https://web.archive.org/web/20231002071157/https://www.fema.gov/press-release/20230803/fema-and-fcc-plan-nationwide-emergency-alert-test-oct-4-2023

WASHINGTON -- FEMA, in coordination with the Federal Communications Commission (FCC), will conduct a nationwide test of the Emergency Alert System (EAS) and Wireless Emergency Alerts (WEA) this fall.

The national test will consist of two portions, testing WEA and EAS capabilities. Both tests are scheduled to begin at approximately 2:20 p.m. ET on Wednesday, Oct. 4.

The WEA portion of the test will be directed to all consumer cell phones. This will be the third nationwide test, but the second test to all cellular devices. The test message will display in either English or in Spanish, depending on the language settings of the wireless handset.

The EAS portion of the test will be sent to radios and televisions. This will be the seventh nationwide EAS test.

There is a discussion on Hacker News, but feel free to comment here as well.

Test Messages Will be Sent to All TVs, Radios and Cell Phones

FEMA and FCC Plan Nationwide Emergency Alert Test for Oct. 4, 2023. Messages Will be Sent to All TVs, Radios and Cell Phones::FEMA, in coordination with the Federal Communications Commission (FCC), will conduct a nationwide test of the Emergency Alert System (EAS) and Wireless Emergency Alerts (WEA) this fall.

FEMA is going to do a nationwide emergency alert on October 4th so if you are in a dangerous domestic situation and/or have a phone that needs to remain a secret then turn off your phone on October 4th and do not turn it back on again until you are safe and alone. The alarm will go through as soon as you turn your phone on again.

I REPEAT DO NOT TURN YOUR PHONE ON AGAIN UNTIL YOU ARE SAFE AND ALONE! #fema #staysafe