A civil authority has issued A REQUIRED MONTHLY TEST for the following counties/areas: Mason; Thurston, WA; at 9:50 AM on AUG 8, 2026 Effective until 12:50 PM. Message from IPAWSCAP. This is Thurston County conducting a test of the Emergency Alert System.  In the event of an emergency, this system would bring you important information.  The following tones will conclude this test.