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Is all-clear signal after tornado not feasible?

Oh.. simple answer..thanks Danny. i didnt think about that.
I dunno I heard that floating around from somewhere. I too always wondered why they just didn't keep em on. Most notably in Springfield, IL, on 5/30. They were on for it seemed longer than 3 minutes. Turned off for 3-5 minutes and started right back up again. I guess they are automatically on 3-5 minute cycles (unless accessed manually). Maybe someone with better knowledge of the exact process can shed some light on that.
 
The process differs everywhere... There is no "standard" on tornado siren sounds. Some do 3-5, some newer all-electric models can go longer. The newest can do voice, and some are even portable now (good idea for festivals!)
 
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