Richard Scorer's A Colour Guide to Clouds PDF
By Richard Scorer
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Extra info for A Colour Guide to Clouds
Wet Grass 44. Wet spiders' webs are found when they have been inside a cloud. The tiny fibres catch the cloud droplets whereas larger objects deflect the airflow with the droplets in it and do not capture them. 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.
Sea fog is common in the warm sectors of depressions. It is also common when tropical air travels over cool sea in other circumstances. Because the sunshine has a negligible heating effect on the cloud itself (See 40), and alters the sea temperature very little (except where the water is very shallow), sea fog is only dispersed when it is carried in the wind over sunwarmed land. Here we see the fog over the water of an estuary being blown on to the land and gradually turned into cumulus. Above is a layer of stratocumulus probably formed by thermals spreading out at that level.
38. Circum^enithal arcs are often seen in ice clouds when the sun is low. They are not usually long lasting, and because they are rather high in the sky they are often not noticed. The centre of the arc is vertically above the observer, and the colours are very bright with red towards the sun. They may be seen in many different forms of cirrus including contrails and the thin edges of ice anvils. There is a contrail in this layer of natural cirrus. 46 39. The glory which surrounds the shadow of the observer when it falls on a cloud can only be formed by water droplets, not ice crystals.
A Colour Guide to Clouds by Richard Scorer