I think you'd have a hard time getting here from LV should things take such a turn ... that said my brother lives in Vegas so you can join him if you like
I'm thinking some sort of quickly deploy-able extra security measures would be a good idea. Something you keep stored in the basement or garage only to be deployed if the S hits the F. Something along the lines of a complete set of bars for the windows that you could install within a couple hours.
Another option might be steel shutters like folk in hurricane country use.
That way in times of peace you're not making it harder to escape a burning house nor interfere with the FD doing their job.