In a building, move to a pre-determined shelter such as a basement. If underground shelter is not available, move to an interior room or hallway on the lowest floor and get under a sturdy piece of furniture. Stay away from windows. If you can, cover yourself with a blanket or sleeping bag. In a high-rise building, use the stairs to go to the designated shelter area or an interior room on the lowest floor possible. If caught outside, lie flat in a nearby ditch or depression in the ground. Mobile homes, even if tied down, offer little protection from tornadoes and should be abandoned.