GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Cold front cloud formation. Diagram showing the formation of clouds (white) along a cold front, where cold air (blue arrow) sinks down, while warm air (red arrow) rises and carries moisture upwards. As the warm air ascends it cools and the moisture condenses to form clouds, which may then release the moisture in the form of rain. Cold fronts can lead to the formation of thunderstorms.
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