Dark blue cloudy sky

What is Cumulonimbus?

A towering cloud that often reaches great altitudes and is associated with thunderstorms, heavy rain, and sometimes severe weather like hail or tornadoes.

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Glossary

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A large body of air having similar horizontal temperature and moisture characteristics.

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A term used to identify clouds with a base height below 6,000 feet in the observer's direction. Stratiform clouds consist...