In addition, their thin walls make them susceptible to windblown debris. Mobile homes do not have cellars in which to seek shelter. Residents of mobile home parks in tornado-prone areas should never attempt to remain in their homes when a tornado approaches. Many parks have designated community shelters, and those that don't, should. The normal lead time for tornado warnings is no more than 20 minutes, and typically less than that, so sometimes there aren't a lot of options when sturdy shelter is not nearby.
Tornadoes harm people primarily through flying debris.
Being outdoors when a tornado strikes poses a threat if there are many things nearby that could go flying through the air, so it's best to be in an open field if possible. Other good, but not great, places are a ditch or under a bridge. It's a really bad idea to stay in your car or to get into a car to get away from a tornado. Cars are death traps in these storms, as they can be flung about by high winds or crushed by debris. Indoors, a small room in the interior of your home, such as a closet or bathroom, offers the best protection next to a cellar.