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Aircraft observations of rain and drizzle from layer clouds

✍ Scribed by F. Singleton

Publisher
John Wiley and Sons
Year
1960
Tongue
English
Weight
569 KB
Volume
86
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

Aircraft observations of droplets greater than 100 ΞΌ diameter in 20 low layer clouds indicate that these drops can occur in concentrations of approximately 0Β·1 per litre to 10 per litre in clouds of 1,000 ft (300 m) to 7,000 ft (2,100 m) thickness. These observations are presented together with data relating the thickness and height of a further 120 layers of low cloud to their ability to produce precipitation at the ground. A diagram is shown which, it is suggested, might be of use as an objective aid for forecasting the occurrence of precipitation from low‐layer cloud.

The results are discussed qualitatively in terms of the condensation‐coalescence mechanism of droplet growth and demonstrate the efficiency of layer clouds as producers of large drops (and consequently precipitation). There is evidence that, for the range of cloud depths considered, coalescence is the predominant mechanism for drop growth for temperatures down to – 11Β°C to – 12Β°C.

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