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All clear: A 100-second alert to be used after a public emergency has been dealt with. The all clear is mainly used during the nationwide siren testing in Argentine Volunteer Firefighters' Day, in the 2nd of June and sometimes, in some sirens, the general warning is tested after the all-clear.
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.
Some sirens still remain as a backup to pager systems. During the Second World War, the British civil defence used a network of sirens to alert the general population to the imminence of an air raid. A single tone denoted an "all clear". A series of tones denoted an air raid.
A British air raid siren from the Second World War. All clear is the signal, generally given by a civil defence siren, which indicates that an air raid or other hazard has finished and that it is safe for civilians to leave their shelters; it is commonly used in radios as well.
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.
Vasu Communications will upgrade controls for the county's 44 tornado warning sirens. American Rescue Plan Act dollars will pay for the project. Richland County to spent nearly $194,000 to upgrade ...
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 ...
Ashland County commissioners gave their OK to replace the tornado siren located near Dale-Roy School at a cost of about $33,000. Homeland Security and EMA Director Anne Strouth gave an update on ...