Originally Posted By: Bill_G

Straight = Alert (have seen it used as a tornado signal)
Wavy = Attack (the old air raid signal)


Bill's got the extra credit. I've always wondered why they still use the straight tone for tornadoes since thats also the test tone. I doubt most people know what those sirens were originally for anyway.


Originally Posted By: LesSnyder
LED.. do I get partial credit for remembering the callsign of the local Ground Observer Corps authentication procedure?


Thats pretty cool Les. Before you mentioned it I hadn't heard of the Ground Observer Corp or the Skywatch program. I had assumed it was all radar based post 1950, especially with the advent of the Nike missle batteries.