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This page was last edited on 20 February 2025, at 19:46 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
A civil defense siren is a siren used to provide an emergency population warning to the general population of approaching danger. Initially designed to warn city dwellers of air raids ( air-raid sirens ) during World War II , they were later used to warn of nuclear attack and natural disasters , such as tornadoes ( tornado sirens ).
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.
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.
Jun. 10—Residents living near the Hermits Peak/Calf Canyon Fire burn scar in Mora County can expect to hear sirens blaring at noon every Wednesday at least through the summer monsoon. The New ...
Locations for the five new sirens will be: on the north side of Ind. 46 and Ind. 246 in Vandalia, at 8964 Keiffaber Road in Arney, close to 6500 Atkinsville Road near New Union Carolina Church ...
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.).
HILLSDALE COUNTY — Hillsdale County’s Office of Emergency Management is making changes to traditional tornado watch and warning sirens.. Beginning March 4, a date planned to mark the beginning ...