In Hawaiʻi, tests of the Emergency Alert System, as well as the Statewide Outdoor Warning Sirens, are conducted on the first working day of the month, in cooperation with Hawaiʻi’s broadcasting industry. When the siren signal is sounded, whether during a test or not, tune to any local radio or television station for emergency information and instructions broadcast by civil defense agencies. Participating stations will carry a detailed explanation of what the sirens mean, as well as other related information.
Notices of the rescheduled or additional testing dates can be found on the Hawaiʻi Emergency Management Agency website. They also provide emergency preparedness information, and information on tsunami warnings.