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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 some tornado-prone regions, tornado sirens, if present, are usually activated within the specified warning region or an entire municipality—varying in coverage based on if a local siren network maintains a sector-organized relay structure—to inform people that a tornado has been sighted or may be forming nearby. Because sirens are ...
Sirens are used on emergency service vehicles such as ambulances, police cars, and fire engines. There are two general types: mechanical and electronic. Many fire sirens (used for summoning volunteer firefighters) serve double duty as tornado or civil defense sirens, alerting an entire community of impending danger. Most fire sirens are either ...
Most Iowa counties activate sirens for severe storms with winds of 65-70 mph in addition to tornado or funnel cloud sightings, said Troy Bass, coordinator with Warren County emergency management.
Oklahoma City tests its tornado sirens every Saturday at 12 p.m., unless there's already inclement weather to be expected. The noise can be quite jarring, especially if there's clear skies and sun.
The upgrade plan does not include Shelby, which maintains four tornado sirens. In other business Tuesday, commissioners approved a $910 base contract with Truly Nolan Pest Control to deal with a ...
During tornado warnings, move to the lowest level of a sturdy building. It is best to go to a basement, safe room or storm cellar. If unavailable, use an interior room or hallway without windows.
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 ...