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Sound sample ⓘ 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).
In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.
The Modulators in Chicago's siren system formerly used to run on the Alternate Wail tone during tornado warnings in order to vary from emergency vehicle sirens. However, in O'Hare International Airport, instead of using the main UV Wail or Attack, they use an Eclipse 8 (possibly) sound card doing attack. Before that is the Westminster Chimes ...
Officials in Tennessee are facing questions after tornado sirens allegedly failed to sound to alert residents to the storm that killed six people.. Tornadoes and severe thunderstorms tore through ...
Blasts of hail were also reported in the area.The NWS lifted the tornado warning for Tulsa at 6.45pm. Credit: Darla Spotts via Storyful Tornado Sirens Sound as Thick Clouds and Lightning Roll Over ...
The statewide tornado drills will occur on Thursday, April 11 at 1:45 p.m. and 6:45 p.m. Tornado sirens will sound in Milwaukee County and many other municipalities.
Pensacola NAS, Florida, ATI HPSS16 (mostly), the sirens on Pensacola's navy base are mostly used for tornado warnings and they play the colors in the morning and evening. When a warning is issued, these siren sound ATI's version of wail signal during tornado warnings. Attack signal or other signals have not been used yet.
Warning sirens could be heard ringing out in downtown Chicago as multiple tornadoes touched down close to the city on Wednesday 12 July. The eerie sound could be heard in footage posted by Twitter ...