Abstract
A simple equation showing the influence of orography on the local change of vorticity is obtained on the basis of the complete vorticity equation. The real velocity is divided into two components: one produced by ascending over the mountain and the other independent of the orography. The component of the velocity induced by the obstacle is given by a model. This idea is applied to the south-western air-stream ascending over the Alps and positive local change of vorticity is obtaied over the Gulf of Genoa. In that way the decrease of pressure and the generation of cyclonic circulation in the Gulf of Genoa, which begins before the cold air comes over Mediterranean, can be explained.
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