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According to the Storm Prediction Center, this is what you should do if a tornado is coming.
Avoid windows. In a house with a basement, go to the basement and get under a sturdy heavy table or work bench, or cover yourself with a mattress or sleeping bag. Know where heavy objects rest on the floor above such as a piano, refrigerator or waterbeds. Stay away from these areas.
In a house with no basement or an apartment, go to the lowest floor and stay in a small center room. The best places are a bathroom, a closet, under a stairwell, or in an interior hallway with no windows. Crouch as low as possible to the floor, facing down; and cover your head with your hands. A bath tub may offer a shell of partial protection. Even in an interior room, you should cover yourself with some sort of thick padding (mattress, blankets, etc.) to protect against falling debris in case the roof and ceiling fail.
