Well after years on this board watching other show there videos of siren tests and such. I figure this woud be a good time to add my own.
Here is the sound of one of 121 sirens used in the Seabrook nuclear power plant early alert system. Its a Whelen 4008 and is just behind the tan building in the movie. Some notes about this test, when i pan back and you see the green mini van (mine) there is another 4008 about 3 miles away. and if you listen closely you can hear sirens from the other towns close by ( Newbury port, Newbury, Salisbury, Seabrook and a few other towns. They did 2 test this year abour 2 minutes of Alert and about 1 min of High/low.
Check it out,
http://www.youtube.com/watch?v=FBMiX4dm-nE