Good advice given. However....
Don't assume that you will have internet connection on your smart phone, just because your cell provider falsely claims widespread coverage. In that "tornado alley" area referred to previously, which includes wide portions of the middle of the country, there are many miles where you will not have cell service.
Many times I've travelled across Kansas, Nebraska, Oklahoma, Missouri, and Arkansas -- areas more prone to tornados -- and not had cell service or sporadic service. These would be areas you would likely be going through based on your desire to get to Detroit from Yuma.
Check areas that you're going to be travelling for the day, and the forecasts for that area. If there's anything troubling in the forecast, then look to alternatives, or hunker down until conditions improve.
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