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.