I skipped class this morning to record this STH-10 sounding for the monthly siren test. You can hear this siren in my tornado warning videos as well. It was pretty loud from where I was standing. I wanted to get a better visual of the siren, but due to the mounting of it was hard to get a good shot of it. Also this siren is on private property and the surrounding areas are clearly marked, so I didn't want to get into trouble. Enjoy!
http://www.youtube.com/watch?v=yszr41-stX4