After several months of crappy weather and failed siren recordings, I finally got something decent. We had our statewide tornado drill this past Wednesday, and a friend and I shot this video on my iPhone.
http://www.youtube.com/watch?v=a3K9d5WsuaE&fmt=18
I also got an HQ audio recording of this test, and we got some pics of the siren.
http://www.youtube.com/watch?v=63ZEyy4Ntqk&fmt=18
Please read the video descriptions for more information.