Cumulus thundercloud, diagram - Stock Image - C018/0293 - Science Photo Library

Cumulus thundercloud. Diagram showing the formation of a thunderstorm cloud (white) along a cold front, where cold air (blue arrow) sinks down, while warm air (red arrow) rises and carries moisture upwards. CLAUS LUNAU/SCIENCE PHOTO LIBRARY

Cumulus thundercloud, diagram - Stock Image - C018/0293 - Science Photo Library