Mammatus Clouds

Mammatus Clouds are pouch-like cloud structures and a rare example of clouds in sinking air. They are usually sighted after the worst of a thunderstorm has passed. When precipitation-enriched air is carried upwards, it loses momentum and begins to spread out horizontally beneath anvil clouds. This air being heavier sinks towards the earth. The sinking air will be cooler than its surroundings and will continue to sink downward. The subsiding air eventually appears below the cloud base as rounded pouch-like structures. Mammatus are long-lived if the sinking air contains snow crystals. They can be a remarkable sight, especially when sunlight is reflected off.

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