If you are aware that a tornado watch has been issued for your area, stay tuned to local radio and TV weather reports. If you feel the need to seek better shelter than your home or apartment can offer, the time to travel to that shelter is when it first begins to storm or slightly before. In Stillwater, four buildings on the OSU campus are offered as public shelter (after normal hours).
When the storm warning sirens sound, it is best NOT to leave your home unless better shelter is just a minute away. If your house does not have a basement, go to the lowest floor and get in a small interior room or hallway. (If you have time, you might get in the bathtub and pull a mattress over the tub.) Stay away from glass and exterior walls.
Some of you may remember an old rule that said opening windows would "equalize pressure." This is iffy at best, and a waste of precious time. Leave the windows alone and get as far away from them as you can. If you are in a mobile home, seek shelter elsewhere. Mobile homes are notoriously unstable and are frequently destroyed during tornados. If there is no storm shelter nearby, go outside and find a ditch or depression and lie flat, face down, and use your hands to protect the back of your head.