Air-raid siren sounds the warning. Air-raid sirens first sounded the warning in London in September 1939. They became an almost daily part of life in the capital a year later during the height of ...

"I could tell right away that the sirens didn't sound like the normal tornado siren. It had the up-and-down pitch of an air raid or an attack siren," added Behnke. That's exactly the tone ...

"I could tell right away that the sirens didn't sound like the normal tornado siren. It had the up-and-down pitch of an air raid or an attack siren," added Behnke. That's exactly the tone Winnebago ...