I don't know how it works in Dallas, but here in Oklahoma City, they test the sirens every Saturday at noon.
So, the right time to attack Oklahoma City, is Saturday at noon?
... or there is a legitimate emergency.
There
was a legitimate emergency. All the bloody sirens were going from 11:40pm to 1:20am, and no one could stop them. I don't know about you, but I'd find that extremely disturbing.
I don't suppose anyone on the forum lives in Dallas, and can tell us what it sounded like?