Those are some very eerie sounds. One in particular reminds me of a visit to a town called Tuscaloosa in Alabama. It was my first ever trip to the US, and it was to visit a lifelong friend, who had emigrated from the UK a couple of years earlier. Whilst there, I heard the tornado sirens more than once, and they were very un-nerving, and certainly unsettled this first time visitor from rural Cambridgeshire. Despite some terrible wind and rain during my stay, there were no actual tornados in the area. However, about 18 months ago, the town of Tuscaloosa, bore the brunt of one of the biggest tornados ever recorded in that area. When it struck, my friend was on her way home from work, and took shelter in a roadside diner. A great many people perished that day, and according to my friend, the scars there are still very real. So I guess it’s thank God for sirens, however ‘eerie’ they might sound.