Yavapai County Community Health Services issued the following announcement on Aug. 4.
FEMA, in coordination with the Federal Communications Commission, will conduct a nationwide test of the Emergency Alert System (EAS) and Wireless Emergency Alerts (WEA) this summer.
The national test will consist of two portions, testing WEA and EAS capabilities. Both tests will begin at 11:20 a.m. Arizona Time on Wednesday, Aug. 11.
Original source can be found here.