San Francisco Giant Voice System

San Francisco Outdoor Warning System

Adam and John remembered hearing San Francisco’s air-raid like test signal every Tuesday at noon from the SF Mevio office on 2nd Street.¬†Officially named the San Francisco Outdoor Warning System – consists of a network of klaxon like sirens and public address speakers mounted on towers spread out over the city of San Francisco. A show producer, Michael Butler sent in a recording of one sending out its test alert in different languages from a tower “out in the Avenues” (Sunset or Richmond district in Western San Francisco).

Download a map of the San Francisco Outdoor Warning System systems and towers.

[NA 547 2:34]


  1. By Robwales

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