From a current Oklahoma resident, but to be a permanent TV resident before the end of the year, the advice to stay inside in an interior room is correct. Have blankets and pillows or a mattress to cover yourselves and protect as much as possible from flying debris. Try to wear shoes and clothing even at night. If there is a hit, you may have to wade through ruble to get out. A direct hit on even a well constructed residence may completely destroy the structure, so there is no guaranteed way to protect yourself 100% if in the direct path of a large tornado - unless you have access to a tornado shelter. Generally, a house with a good foundation is better than a mobile home, but still no guarantee. In Oklahoma, we expect them this time of year - especially in early May. We don't have a tornado shelter in our Oklahoma home, but if we were planning to stay in Oklahoma, we would definitely have one of the new bolt down steel shelters installed in our garage. Even then there have been F4 & F5 tornados in Oklahoma that have completely demolished large, well-built homes to the point that only the foundation remains. So, I don't know if a bolt down shelter would even be enough in a direct hit from an F4 or F5. You just have to do the best you can. Life's risks are many, and one cannot avoid them all - not even in a paradise like TV.