http://www.flickr.com/photos/58979889@N06/5402958346/
http://www.flickr.com/photos/58979889@N06/5402311049/
http://www.flickr.com/photos/58979889@N06/5402930488/
http://www.flickr.com/photos/58979889@N06/5403122108/
One of the ladies I spoke with when I checked out at the front desk said that she remembered this siren sounding at noon when she moved in the neighborhood back in 1973. One of the electrical boxes is manufacturer date stamped August 1994, so the electrical must have been upgraded around that time.
This is one low siren. I am guessing 20 feet maximum, but probably less. There are homes neighboring the building the siren is attached to just on the other side of the fence. It must have one bad day for those residents on test day

My next adventure is to try and get pictures of the Thunderbolt on the roof of the Maricopa County office building in down town Phoenix. That one may be a bit more tricky since it is a government office building and it is almost next to the Maricopa County Jail.
Justin