When you have EF-5s it doesn't matter what kind of house you're in. You need to be underground and buttoned up.
Look up info on the Jarrell tornado here a few years ago. There's a pic that shows a stretch of asphault road that has been completely ripped out down to a depth of almost 12 inches, just completely gone.
Texas Taskforce 1 is headed up there. TT1 is the A-Team of disaster relief. I love my adopted state.