FEMA, in partnership with the FCC, will conduct an Emergency Alert System test (through television and radio) and Wireless Emergency Alert (through mobile devices) on Wednesday, August 11th at 11:20 PST.

Only phones that have opted in to receive system test messages will display the test message, which will read: “THIS IS A TEST of the National Wireless Emergency Alert System. No action is needed.”

For instructions on how to opt-in to receive the test message on mobile devices, visit https://www.fcc.gov/sites/default/files/weatest_opt-in_instructions.pdf