By Richard Scorer

ISBN-10: 008010374X

ISBN-13: 9780080103747

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The speeds of movement of clouds, particularly small cumulus, can be measured by watching the rates of progress of their shadows across the countryside. Distances can be estimated from a large-scale map or by some other means. 3. The positions of clouds can be estimated from the positions of their shadows or inferred from the positions of hills which may be causing them, and their heights may then be estimated from the angle of elevation by simple trigonometry. If the height of cumulus base is known (by comparison with a mountain of known height, for example) and appears fairly uniform, the height of the tops may be estimated from the angle of elevation.

34 Wave Clouds, Billows 27. Clouds at three distinct levels are seen here. The cumulus is typical of hilly country—it forms predominantly over the higher ground (where the heat of the sunshine is put into the atmosphere at a higher level), and is tending to form streets along the wind. Across the middle of the picture is a wave cloudy which has a smooth outline, and remains almost fixed in position in the sky as the wind blows through it. It is a water cloud at about two miles above the ground.

The droplets then amalgamate on the threads into larger drops. This is not dew deposited, though a web might act as a centre for the condensation of dew if it were in the air cooled within an inch or two of the ground. 52 45. Guttation, which is the exuding of water from the tips of the blades of grass, occurs on summer nights when the ground and the roots of the grass are warmer than the air. This is not dew, and can easily be distinguished from it because dew is deposited on grass in the form of very many tiny droplets along the edges of the top few inches of the blades of grass.

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A Colour Guide to Clouds by Richard Scorer

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