Civil defense siren  

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A civil defense siren (also referred to as an air raid siren, tornado siren, tsunami siren, or other outdoor warning siren and also rarely referred to as the doomsday siren) is a mechanical or electronic device (modern-day sirens are electrically-powered) for generating sound to provide warning of approaching danger and sometimes to indicate when the danger has passed.

Initially designed to warn of air raids in World War II, they were adapted to warn of nuclear attack and of natural phenomena such as tornadoes. The generalized nature of the siren led to many of them being replaced with more specialized warnings, such as the Emergency Alert System.




Unless indicated otherwise, the text in this article is either based on Wikipedia article "Civil defense siren" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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