By Richard Scorer
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Often there is drizzle or light warm rain on hills in the warm air, and if the cloud is in contact with the hills it is called hill fog. 30 23. e. where the warm air is, are not always drizzly like 22, and inland in summer the sun's heat penetrates through the thin layer of low cloud; by warming the ground, it starts up thermals which gradually evaporate the stratus and produce cumulus, as in this picture. 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.
Cumulonimbus in deep cold air is here illustrated with the lower clouds leaning forward (to the left) showing that the wind is stronger at higher levels. The anvil has snow and rain falling from it, and this gives it the softened outline, while a newly growing part of the cloud penetrates, with sharp white outline, far above the spreading anvil. At the top of the picture we see the evaporating edge of smaller cumulus. This cumulonimbus is typical of cold windy days in polar air that has recently come from a cooler latitude.
5. g. by method 2) the height can be estimated from the apparent angular motion when observed from a fixed point. If the height is known the speed may likewise be computed. 6. If the distance is known approximately the rate of rise of cumulus tops can be measured by observing the rate of increase of elevation of the top. This may be done by watching the cloud top move up beyond a pole (with lengths marked on it) at a known distance. 7. The wind direction may be observed by watching the movement of the clouds across the top of a pole while standing at the base.