Beginning today at 10:20am AK FEMA, in coordination with the FCC, will conduct a nationwide test of the Emergency Alert System (EAS) and Wireless Emergency Alerts (WEA).
During this test TV stations, Radio, and cell phones may receive alert notifications.
For more information:
https://www.fcc.gov/document/fema-and-fcc-plan-nationwide-emergency-alert-test-aug-11
https://www.fcc.gov/emergency-alert-system
https://www.fcc.gov/consumers/guides/wireless-emergency-alerts-wea