I got well scared just now....
Its 2 in the morning, and you know those old war sirens they had? The one that goes low pitched to a mid pitch, stays like that for a few seconds, and then goes low again, and repeats? I've always wondered if they'd still have technology in place to allow that sound for people to prepare.
Well, I just heard that sound coming from far away outside. The wind must have just picked it up, and sent it over this way. Because, it suddenly became hearable, starting from a low pitch, and going up.
Its still playing the mid sound though, and hasn't dropped again, so unless the speakers broken, I'm guessing its just traffic noise...
Scared me though, for sure...