Orlando probably did and still does maybe because of Universal Studios and attractions. But none that I know of, I went to Orlando about a week ago and did not see any sirens. Orlando had a system of Thunderbolts and 5T's last I recalled, but they were removed in the late 80's to early 90's. The Ta...

I am sorry for bumping this topic from 2011. Let me add a little bit: In my 1st Elementary School (Pre-K 1998-1999, remainder of 1999-2000, and 2000-2001): [*]They would sound a (probably a few) long blast(s) on their school bell (1250 hz sine wave tone) through the intercom. We took shelter in the ...