Air-raid siren sounds the warning. Air-raid sirens first sounded the warning in London in September 1939. They became an almost daily part of life in the capital a year later during the height of ...

Switzerland tests its apocalyptic-sounding sirens on the first Wednesday of February. On 5 February 2025, over 5,000 sirens ...

Events that can trigger a siren to sound are confirmed winds of 70 mph or greater; hail 3/4 inch in diameter or larger; a tornado warning issued by the National Weather Service; or the release of ...