Well friend you have brought up a subject that I am very aware of. I live in central Oklahoma. I was here when we got the big May 3rd 1999 series of tornados.
Two things saved people's lives.
1) Weather news awearness. IF the local weather people are good, and you have a radio or TV and are watching the situation go down, you may be able to side step it coming in. Then again you may have to go to #2. The weather may just be too bad to move away from its path. Heavy winds, heavy rain, debris all over the roads. Not a good situation to be driving around in a Honda Civic with two little girls in car seats.
2) Get your family below ground with good overhead cover. You may die if you do not do this.
I am a looser as I have no below ground cover at my house.
My plan right now is to litteraly climb under the house with the kids and shelter against the west side cement footing. I plan on covering us in a sleeping bad to keep the dirt out of the kids faces. Tornado's generally move west to east here.
When I do get underground cover, my family miles away from me will know about it. The neighbors next to you may be gone or in the shelter with you IF you were trapped in it from debris.
Links to what it could be like:
http://www.nssl.noaa.gov/news/may3rd/outbreak.htmlhttp://www.rogerbondy.com/56781-tornado-path-moore-oklahoma.htm