Abstract
A model has been constructed of the orographic enhancement of snowfall by the seeder-feeder mechanism. It is found that the collection of water from the feeder cloud is much more efficient than with rainfall under similar conditions, producing significantly larger enhancements of up to three times the seeder cloud precipitation rate. Over long hills growth is mostly by vapour diffusion, with riming dominating over shorter hills. It is found that the peak snowfall enhancement is strongly dependent on hill height, wind speed and feeder cloud depth over a long hill. These sensitivities are much weaker or are absent over short hills due to the large effects of wind drift.
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