The white puffy clouds that have been growing all day are replaced by a gray sky. It starts to rain. Welcome to a thunderstorm. Thunderstorms are one of the most thrilling and dangerous of weather phenomena. Over 40,000 thunderstorms occur throughout the world each day.
Thunderstorms can cause a lot of damage.
Tornadoes can uproot trees and demolish buildings. Hail can damage cars and crops. Heavy rain can create flash floods. Lightning can spark a forest fire or hurt you. Safety during a thunder storm is very important.