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Audio file of a tornado emergency that was issued for Greensburg, Kansas prior to the 2007 Greensburg, Kansas, tornado, killing ten. This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code .
The National Public Warning System, also known as the Primary Entry Point (PEP) stations, is a network of 77 radio stations that are, in coordination with FEMA, used to originate emergency alert and warning information to the public before, during, and after incidents and disasters.
It consists in a modulated sound going up and down (up to 380 Hz) during the first minute, and repeated three times. The end of alert is a continuous signal lasting 30 seconds. The system is tested the first Wednesday of every month at 11.45 in the north, 12.00 in the center, and at 12.15 in the south; for tests, the modulated signal is played ...
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 ...
Tornado sirens sounded in New Berlin, Wisconsin, on Wednesday, October 12, according to the New Berlin Fire Department.The National Weather Service issued tornado warnings for parts of eastern ...
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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 ...
Federal Signal Model 5 in Ballston Spa, New York, U.S.. Sirens are sometimes integrated into a warning system that links sirens with other warning media, such as the radio and TV Emergency Alert System, NOAA Weather Radio, telephone alerting systems, Reverse 911, Cable Override, and wireless alerting systems in the United States and the National Public Alerting System, Alert Ready, in Canada.