By Richard Scorer
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Additional info for A Colour Guide to Clouds
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. A good example of dew is often to be seen on a car roof, and the moisture comes from the air. Violent Storms 46. A tornado is the most violent kind of storm that can occur in the atmosphere.
When the cumulus is combined with the cirrus of the depression some of the most beautiful skies to be seen in temperate latitudes are displayed. 24. The cold air returns when the cold front arrives. This is often a line of cumulonimbus formed where the cool air lifts the warm damp air. Although not all cold fronts are accompanied by the kind of refreshing clearance of storm clouds shown here, they are the most interesting and produce very rapid, beautiful, and dramatic changes in the sky. In this example mamma can be seen in the anvil of the nearest cumulonimbus.
If there is a difference in wind between the top and the bottom of the layer the cloudlets are formed into rolls (See 32). 48 41. Stratus and Altocumulus layers at dawn show that the air is stable. The wind is light so that there are no waves visible in the altocumulus layers above (waves would form shapes like 28 and 29 if they were present). The layer of stratus below is at the top of cool air which fills the valleys and which does not move with the wind above; little fragments of cloud are being carried off the top by the wind.