The national test will consist of two portions, testing WEA and EAS capabilities. Both tests will begin at 2:20pm on Wednesday, August 11, 2021.
The Wireless Emergency Alert portion of the test will be directed only to consumer cell phones where the subscriber has opted-in to receive test messages. This will be the second nationwide WEA test, but the first nationwide WEA test on a consumer opt-in basis. The test message will display in either English or in Spanish, depending on the language settings of the wireless handset.
The Emergency Alert System portion of the test will be sent to radios and televisions. This will be the sixth nationwide EAS test.
https://www.fema.gov/emergency-managers/practitioners/integrated-public-alert-warning-system/public/emergency-alert-system
https://www.fema.gov/emergency-managers/practitioners/integrated-public-alert-warning-system/public/wireless-emergency-alerts