Clouds travel at different speeds depending on the speed of the wind. The wind is moving air and clouds are afected by it. High above the earth the wind can move at up to 170 miles per hour or more and so high cloud will move very fast. Lower down the wind is usually slower and so the clouds will move more slowly. If you observe the clouds you can sometimes see them moving at different speeds at different levels and even in different directions. When you observe the movement compare it with a fixed object such as a tall building, lamp post or tree.
Weather forecasters use cloud movements to help them to forecast weather changes.
Peter Halford, Science and Technology Teacher, Imperial War Museum Duxford.
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