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2. Civil defense siren - Wikipedia

   en.wikipedia.org/wiki/Civil_defense_siren

   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).

3. Why is the tornado siren going off? What to know about ... - AOL

   www.aol.com/why-tornado-siren-going-off...

   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.

4. Federal Signal Modulator - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Modulator

   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 ...

5. List of sirens built by Alerting Communicators of America

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

   This siren is similar to Federal Signal's Thunderbolt series. Only a single unit remains in service in Milwaukee, WI. Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12, 10/12 1968–1994 Omni Directional 102–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's vertical sirens. Sentry 95

6. Richland County to spent nearly $194,000 to upgrade tornado ...

   www.aol.com/richland-county-spent-nearly-194...

   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 ...

7. Will there still be a tornado siren test today, despite ... - AOL

   www.aol.com/still-tornado-siren-test-today...

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8. ATI HPSS - Wikipedia

   en.wikipedia.org/wiki/ATI_HPSS

   They run 575 Hz alert for tornado warnings. Menominee, Michigan has three rotating ATI HPSS32R units; 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 ...

9. Does Knoxville have tornado sirens? - AOL

   www.aol.com/does-knoxville-tornado-sirens...

   Sirens typically cost between $30,000 and $50,000 each to install, Ickes said. The total cost in Knox County would likely be somewhere between $6 million and $12 million initially, plus ongoing ...