MacDonald, Alexander Forsyth, 1897-1965 · Port Credit, Ont. : Aviation Service Corporation · leaf 57
advances on a mass ofcold air, the warm air, being hghter, ascends over thecold air in a long gentle slope. The rising warm aiigives rise to the cloud sequence showm in Fig. 19ranging from high Cirrus, down through Altoslratus toNimbostratus. Thus the approach of a Warm Frontis marked by a gradual… … Fig. 19. Vertical Section through a Warm Front. The Cold Front When a mass of cold air overtakes a mass of warmair, the cold air imdercuts the warm air violently. Therapid ascent of the warm air gives rise to Cumulonim-bus cloud with a short period of squally, showery rain,sometimes very heavy and…
Airplanes
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