Results of some calculations are presented which show that the washout of droplets in a low‐level, orographically produced cloud by raindrops falling from a higher‐level cloud (formed by large‐scale ascent) can augment the rainfall rate by several mm h −1 over a hill a few hundred metres high. The dependence of this enhancement upon different meteorological parameters is discussed and calculated values are compared with some observed rainfall rates over south Wales. It is considered that this mechanism is most effective in enhancing warm‐sector precipitation over hills.
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Bader et al. (1977) studied this question.
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