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  2. File:Federal Signal RSH-10 Thunderbeam video.ogv - Wikipedia

    en.wikipedia.org/wiki/File:Federal_Signal_RSH-10...

    English: Video of Federal Signal Thunderbeam Warning / Civil Defense Siren Test in "Alert" mode for Severe Weather Awareness Week. Recorded in St. Paul, Minnesota, USA. Recorded in St. Paul, Minnesota, USA.

  3. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    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).

  4. Emergency population warning - Wikipedia

    en.wikipedia.org/wiki/Emergency_population_warning

    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 ...

  5. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    The i-Force is an electronic siren made by ASC that comes in many different sizes (Sound Cells). Similar to Federal Signal's Modulator. E-Class Electronic none none 2002–Present Omni Directional dB rating depends on how many drivers. 400 watt speakers can be arranged in whichever pattern is needed. Very similar to ATI's HPSS omni-directional ...

  6. Warning sirens sound as multiple tornadoes touch down near ...

    www.aol.com/warning-sirens-sound-multiple...

    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 ...

  7. Tennessee tornado sirens failed to sound in storm that ... - AOL

    www.aol.com/tennessee-tornado-sirens-failed...

    Since 2003, such sirens have been used in the state to alert residents to imminent danger from tornadoes.. In 2013, a $2m grant was provided to the Nashville county to upgrade the system with new ...

  8. ATI HPSS - Wikipedia

    en.wikipedia.org/wiki/ATI_HPSS

    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.

  9. Tornado Sirens Sound as Thick Clouds and Lightning Roll Over ...

    www.aol.com/news/tornado-sirens-sound-thick...

    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 ...

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