Well I attempted to get an ambiance of the sirens in Osage City, Kansas. They have a Thunderbolt 1000, couple of 2001s and a couple of Whelen 2802s. They sounded in attack surprisingly, but I wasn't able to get the wind up and was a bit far away from the sirens. They sounded a little late or I would have been a little closer.
https://www.youtube.com/watch?v=ws9dY4z1KSM