Stupid! Won't work. If a person is asleep all of their electronics are turned off. Our cable system is constantly testing the emergency system interrupting programming. I have never received an emergency broadcast when my television was off. On the other hand my weather radio warned me of an approaching tornado that actually touched down three miles from my home. The correct solution would be to create a system like the emergency weather alerting system.
Build FM Radios with an emergency broadcast decoder that would receive a signal, like the Radio Data System, on an FM Station sub-carrier. Public radio FM Stations could transmit the signal. FM radio receivers with emergency decoders would automatically seek out stations transmitting emergency data on the sub-carrier. The owner should be able to configure the radio to respond to emergency alerts from the nearest appropriate jurisdiction. An emergency FM Radio would never turn off completely. The tuner and emergency decoder would always be listening for an emergency alert. Battery back up should be mandatory.
Here is the BIG problem. No matter how you shovel out the warnings there will be people in harms way that will not hear or heed the warning. Lowest common denominators, like community sirens (antiques, I know) get around the fact that most people are not tuned into the same local mass media source. Natural Selection (Darwin) will weed out those who ignore the warnings.
reply to Mr Matt more stupid false warning abuse. Whoever comes up with this stupidity should be shot. Pay attention to what its doing outside, then you have no probs