I was surprised to see that the Thunderbolt in downtown Stamford Connecticut had rotated for the first time in years. I had assumed that the system had been abandoned. There used to be a Tbolt on top of Ridgeway shopping center; when the center was rebuilt the siren was removed and not replaced. There's another rotting off the pole on Newfield Avenue.
While the downtown siren looks like it went off, the one on the roof of Rogers School didn't rotate. I understand it's theoretically possible for the horn to stop in the same position it started, but I've never seen it actually happen.