I was surfing the web today because I was bored, and I decided to search "Arizona Sirens". While I was searching I came across safety.com and saw Tempe Arizona and Tempe Town Lake was under one of their top siren installations. Well I never knew Tempe has had Whelen's since 1999, and they are used for Monsoons or for when the Salt River is running or if it is going to flood. Since the City is built all around the river. They also have 3 special siren towers with 2 sirens on each pole, that are painted red. They are located by the town lake with strobes on top. The white strobe indicates wind and the stronger the wind the faster the white strobe will flash. When the yellow or amber strobe comes on, that indicates lightning is present. Then there is the red strobe, when that one comes on the 3 siren towers by the town lake sound their two sirens for a evacuation of the town lake. The rest that cover the city, and are not by the lake are your average Whelens. Although I could not find anything about the sirens being tested I will still look into that and hopefully get to hear my first siren. I will hopefully be able to get out there and look around to see if I can get better quality pictures.
Anyways here is the only picture I could manage to find of one of the siren towers by the lake: