Initially designed to warn city dwellers of air raids during World War II, they were later used to warn of nuclear attack and natural disasters, such as tornadoes. Some sirens, especially within small municipalities, are also used to alert the fire department when needed. It is sometimes sounded again to indicate the danger has passed. Sound sample ( helpĪ civil defense siren, also known as an air-raid siren or tornado siren, is a siren used to provide an emergency population warning to the general population of approaching danger. They are tested once a year on the first Wednesday in February. TWS 295 Sirens, HSS Engineering siren Warning System Federal Signal Thunderbolt 1003 There are 8,200 alarm sirens for civil protection throughout Switzerland. Outdoor warning device used to audibly warn about incoming or ongoing danger
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