Thunderstorms
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A thunderstorm is a storm that has lightning and thunder.
They also usually cause heavy wind and rain.
Some thunderstorms may even cause tornadoes.
Thunderstorms are formed by the movement of warm air.
When the air rises and becomes unstable, then thunder and lightning can occur.
There are four types of thunderstorms: single-cell, multi-cell, squall line, and supercell.
Single-cell only have one updraft and are hard to predict.
Multi-cell thunderstorms are the most common, are clusters of storms, and may cause flooding and tornadoes.
Squall lines are lines of storms along a cold front. They can be very dangerous and have frequent lightning.
Supercell thunderstorms are very large and severe. They cause large tornadoes and hail.
Thunderstorms are fairly frequent events.
They are most common in rainforest.
Most thunderstorms in the United States are in the Midwest and South.