A weather radio only helps if it is on 24/7/365. I purchased one that I could wire directly into my housebank and run off 12v. It is a Midland 74-200, which I believe is not made anymore. Mine has been on for 11 years now.
As previously mentioned, alerts are given by county. So when traveling in tornado alley, that is one item you need to stay abreast of. Having a few minutes warning, with a plan in place beforehand, can make a huge difference in the outcome.
George R. - Fulltiming since January '03
2007 Newmar Mountain Aire 3991
2012 Chevy Malibu LT1