We have an app called "Weather Radio". The paid version lets you "pin" locations on a map, and you can specify what NOAA watches and warnings you want to be alerted about. It also "follows" you, to alert you wherever you are. This is very handy when traveling!! It will also sound a warning for severe weather, and yes it will wake you up!
Staying in our rig as housing, we've left a few times due to tornado warnings this year, since our park did not have a good storm shelter. Not ideal... But in those cases we had plenty of warning.
One time, during a tornado warning, we did not have enough warning and just headed to our park office. Rotation was reported in the storm, so we feared a tornado could develop at any time. You don't want to be in an RV for that. There were not very many taking shelter there ,and at least we were inside a sticks and bricks vs the trailer.
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