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The sirens are tested at 1500 on the 3rd of every month. The test comprises the following: [9] 3 minutes of the alert warning (a continuous, stepped, rising tone) 1 minute of silence; 1 minute of the all clear siren (a continuous constant tone) Local volunteers monitor the sirens on test day. [10]
A siren is a loud noise-making device. There are two general types: mechanical and electronic. Civil defense sirens are mounted in fixed locations and used to warn of natural disasters or attacks. Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines.
The use of flashing lights and sirens is colloquially known as blues and twos, which refers to the blue lights and the two-tone siren once commonplace (although most sirens now use a range of tones). In the UK, only blue lights are used to denote emergency vehicles (although other colours may be used as sidelights, stop indicators, etc.).
When activated, sirens will sound for 3-5 minutes and repeat every 10-15 minutes while a warning is active. They do not sound continuously or issue an "all clear" alert when a warning expires.
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Public safety officials will test the emergency sirens at the R.E. Ginna Nuclear Power Plant in Ontario on May 7. The annual test will include 96 sirens, blaring for about four minutes between 9: ...
San Francisco, California - This system is unique featuring the sound of the decommissioned Federal Signal STL-10 sirens that the HPSS units replaced; Casitas Dam, Ventura, California - This system is unique as they look like the Federal Signal Directional Speaker Array (DSA) sirens, but can have 7–8 speakers per stack, and gray caps on the speaker cones.
All sirens sounded in a male voice message that says “ATTENTION! ATTENTION! THIS IS A TEST OF THE EMERGENCY SIREN SYSTEM. THIS IS ONLY A TEST!” The message repeated a few more times and followed by a steady 3-minute alert tone. Testings concluded with another male message (the same voice) that said “ATTENTION! ATTENTION!