A hailstorm is a kind of bad weather when hard balls of ice fall from the sky.
Hailstorms can be scary and dangerous, and they can hurt people and things.
Examples:
The hailstorm was very loud.
During the hailstorm, we stayed inside.
The hailstorm broke all the windows.
The hailstorm was like a big ice fight!
The hailstorm was so strong, it sounded like drums on the roof.
The hailstorm was so big, it looked like the sky was throwing ice balls at us.