BIG difference between a Tornado sounded siren and an Air Raid sounded siren.
The best way I can describe the difference is a Tornado siren sound is a steady continuous wail where as an Air Raid siren sound rises and falls in sound. Think the back ground siren in Black Sabbaths "War Pigs".
Funny story (now it is)
In 1987 the Police / Fire Communications center moved to it's new location.
At 09:30 on every Monday they test the "Tornado Sirens".
I'm in a meeting and the sirens go on, no biggie. It's Monday 09:30.
Then they start rising and falling.........OH FUCK!!!!
I know that DOD Regulations do not allow testing of the Air Raid signal.
Yet, it's on! I switch to the MRTI radio / telephone on my portable radio and TRY to call the Comm Center. They have 12 911 lines, THEY WERE ALL BUSY!
My wife was working F1 Police frequency that day. Finally I get through to one of the dispatchers.
I'm told, it's a mistake and they can't shut it down....at this point it's been running for 25 minutes CONTINUOUS.
Come to find out the Comm Center Supervisor accidentally turned it on and didn't know how to stop it.
Panicked an Air Guard Base, an Army Reserve unit, and an Army National Guard unit. (And Me)