Thunderstorms are cumulonimbus clouds that have lightning and thunder. These are deep clouds with strong updrafts, with a cloud base near the ground and cloud top near the top of the troposphere (roughly 11 km above sea level). Mature thunderstorms have a characteristic anvil or mushroom top, which can spread large distances (hundreds of km) downwind if blown by strong winds aloft.represents thunderstorms (think of it as a T for thunderstorm, with a lightning bolt coming out the side). In text-based reports, cumulonimbus clouds are abbreviated as CB. So sometimes thunderstorms are called CBs
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