Ok, I have heard so many different answers to this question I am about to ask about the video below. In this video which I believe takes place in Conway, Ar, there are of course are two different sirens sounding, one obviously is a T-bolt 1000T, the other I have heard three different answers now, (#1) 2001, (#2) T-bolt 1000-single tone, and (#3) A Whelen Vortex. Now is there anybody in here who lives in this area or knows 100% what the second sirens is? Here is the video below.
http://www.youtube.com/watch?v=oV7v1i6Q8LU