This is if it is a really bad hailstorm. If it was small, then you'll just want to stay inside.
*If you are caught in a hail storm while driving, IMMINENTLY find cover (A garage, a bridge above the freeway, etc.)
Do NOT get out of the car. Your car may get dented, but it will keep you from getting dented.
Cover your face and small children. Keep something over you (incase glass shatters.)
*If you are caught in a hailstorm while you are in a building, stay away from the windows.
Make sure you know where everyone is. Don't go outside or use phones or electric stuff. You could get electrified.
* What to do if you are caught in a hailstorm while outside.
Find shelter as soon as possible. Cover your head, and (if possible) cover your whole body.
Stay away from telephone lines so you don't get electrified. Stay away from trees. They may fall over or loose branches.
*What is hail?
Hail is frozen rain. Don't confuse it with snow.
I had found a great web-sight that I used for this post.
Check it out!