The first siren I saw was the 2001-AC at McGucken Park in Huntsville, AL.

2001-AC siren at McGucken Park by freebrickproductions, on Flickr
The next siren I saw was a Whelen along US 231 in Arab, AL, but unfortunately I wasn't able to get any pictures. The siren is located here (the placemark for it is located on the fourth page of the map).
After that, I stopped at Cleveland, AL's town hall to photograph the Sterling 2v8 and Whelen 2809 there.

Whelen 2809 and Sterling 2v8 sirens by freebrickproductions, on Flickr

Whelen 2809 by freebrickproductions, on Flickr

Whelen 2809 by freebrickproductions, on Flickr

Sterling 2v8 by freebrickproductions, on Flickr

Sterling 2v8 by freebrickproductions, on Flickr

Sterling 2v8 by freebrickproductions, on Flickr
Then, I stopped in Rosa, AL to photograph a Whelen Hornet I found at their town hall.

Whelen Hornet by freebrickproductions, on Flickr

Whelen Hornet by freebrickproductions, on Flickr

Whelen Hornet by freebrickproductions, on Flickr
The second to last siren I saw was a Whelen Vortex in Allgood, AL at the fire department.

Whelen Vortex by freebrickproductions, on Flickr
I also saw the 2001-AC at Clay, AL's town hall. I'm pretty sure this siren is a second generation 2001 because it looks like the one in McGucken Park (which I' pretty sure it's a second generation 2001 as well) and reading some posts on the forum as well. The siren is located here (the placemark is on the second page of the map).
That's all from yesterday's siren hunt!