Sandbags
Sandbags are a bag filled with sand, typically used for defensive purposes or for protection from flooding.

The best shelter from a tornado is a basement or storm cellar. If neither one is available, go to an inside room without windows on the lowest level of the building. Cover yourself with something, such as pillows, a mattress or blankets. Place as many walls between you and the outside as possible.

Windows and doors are especially susceptible to wind damage, and water can infiltrate your home quickly if these openings are breached.