Go to the basement, get under a table, workbench or other sturdy furniture.
If there is no basement, go into a small interior room on the lowest floor. Closets, bathrooms and interior halls afford the best protections. Stay away from windows!
In an apartment
Move to the innermost room on the lowest level or to a pre-designated shelter area. Crouch down and protect your head from the flying debris. Avoid areas with glass and large roof spans.
In a mobile home or vehicle
Abandon it immediately and seek and sturdy shelter or permanent structure.