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Precipitation growth at a cold front

✍ Scribed by P. R. Jonas; R. C. Tabony

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
541 KB
Volume
99
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

A simple model of the growth of precipitation particles in cloud systems in which the air flow is known has been used to calculate the growth of hail pellets at a cold front. The calculated pellet sizes and densities, and surface rainfall rates, are consistent with observations. It is shown that in the 3 km deep frontal cloud the larger hail pellets were grown during at least two ascents in the strong updraught. The growth of large pellets depends on the airflow being such as to cause two ascents, and small changes in the airflow can prevent the growth of large hail pellets.

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## Abstract In this paper we consider 15 cases of line convection at ana‐cold fronts which have been observed by radar. Although line convection can be a simple two‐dimensional feature, it is usually broken up into line elements having lengths from a few to many tens of kilometres separated by some