Here's some info I got from our news site.
Surviving a Tornado
If you are in a home or small building, go to the basement or an interior room on the lowest level, such as a closet or bathroom. If possible, get under something sturdy and cover your head.
In a high-rise building, go to a small room in the interior. Avoid windows or rooms with exterior walls.
In schools, nursing homes, hospitals, factories and shopping centers, go to a predesignated shelter area.
In a mobile home or car, leave immediately and go to a substantial structure.
If you are outside and unable to find shelter, lie flat in the nearest ditch, ravine or culvert and cover your head with your hands