Sirens will wail on Aug. 25

Annual test of the Early Warning System will take place on Saturday

COUNTY — The San Luis Obispo County Early Warning System (EWS) sirens will sound on Saturday, Aug. 25 for their annual full-scale test.
The Early Warning System sirens extend throughout the Emergency Planning Zone that extends in a circular area from Diablo Canyon. Originally the siren system was installed for an emergency at Diablo Canyon Power Plant, but they can be utilized for any disaster where actions, such as evacuations are needed to be taken by the public due to a tsunami or dam failure.
Sirens will sound at noon and at 12:30 p.m. for about three minutes. During the tests, no action is required on the part of the public.
The sirens are tested regularly, including twice monthly silent tests, quarterly growl tests, and the full-scale annual test in August.
At other times when activated, the sirens will produce a steady wail for three to five minutes and is an indication that the Emergency Alert System has been activated.  Emergency information and instructions will be provided via local radio and television stations. If you are at sea, tune into Marine Channel 16.
To learn more about the Emergency Planning Zones and about the sirens, visit
For questions, contact the County Office of Emergency Services at or call them at 805-781-5011.


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