Take light objects inside. Close windows and doors and brace them if possible. If a storm is nearby, DO NOT go outside. Next to flash floods, lightning is the second greatest storm-related killer. If you are in an automobile and you hear a severe thunderstorm warning in your area, try to get the vehicle into a garage, or under some form of protection such as an overpass on a highway.
Large hail can cause serious injury and has even been known to kill people.
If you find yourself trapped in your vehicle during a period of dangerous hail, pull safely onto the shoulder of the road. Beware of parking under large trees to protect your vehicle from the hail. It is very common during severe storms for trees to lose their branches, and you do not want to be parked under a tree when that happens. Get down on the floor of your car and wait out the storm. Hailstorms generally last only a few minutes.