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My area's weather sirens are the electronic kind that have the voice recording. I can never hear or make out what it's saying. Certainly doesn't seem as loud as the old mechanical kind.
Kinda weird if OP's area is using the wail "attack" warning, which is different from the continuous tone "alert" warning usually used for weather.
We have the air raid sirens for our local nuclear power plant (Indian Point).
They test it regularly, and a few times a year they have it at half or full volume for about 4 minutes. They announce those in advance, but it's kind of jarring hearing it when you are sleeping and not expecting it.
we have 8200 sirens in our country, some of which are mobile (only for underpopulated areas I think).
99% of the population is covered.
They're tested once a year in a specific day at 13:30 and they warn you before so it's never a suprise. http://www.youtube.com/watch?v=91P5HjfQIkA
here you can hear the classic mechanical model (that's the one I hear in my city too) and in the background at 2:07 you can hear the newer electronic one in the distance.
There are different signals frequencies of the high-low sound for general alarm and water alarm (which is used if a dam breaks).
Here are all the different models in use: http://www.bevoelkerungsschutz.admi...ome/themen/alarmierung/poly/sirenentypen.html
We have them all over here, they are tested the first Saturday of the month at 1pm during tornado season. Otherwise, they only go off if there has been a tornado sighting, though the system is also technically still used for more general warnings, or nuclear disasters. They are the old mechanical kind that rotate on the top of a tower, and they are very, very loud.
I think it was all of those nuclear war movies in the early 80's where those sirens blasted right before the bombs exploded that got me. When I was 8 or 9, the end of the world was a huge fear because of the cold war.
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