For the last four or five years we have used an app on our iPhones called Weather Radio. Think I paid $9.99 for it originally. Don't know what it costs now. It tracks your location and will wake up my iPnone if there is a weather alert where I am located, when traveling.
We have a standard weather radio but you have to turn it on at bedtime and know what county you are in as that seems to be the way weather warnings are given. The app keeps track of our location. Best weather app I have found. Having grown up in southern Oklahoma, I have a very healthy respect for what tornados can do to RVs, buildings, etc.