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This cold and moist air enters the Mediterranean basin, and is deflected by the high mountains of northwest Corsica, which divert the air mass to the northeast, triggering cool and wet Libeccio winds in response into to the Ligurian Sea, which in turn hit the western Apennines located in the immediate vicinity of the sea.
Effects on climate:
The depressions bear rain, often intense, on the Ligurian coast and hills of Tuscany, due to orographic lift which affects the southern side of the Apennines. The area of low pressure is slow moving, and may follow a trajectory from west to east, then going on to affect the regions of the Adriatic, or move from the north-west to south-east down along the Tyrrhenian Sea: in this last case, the structure will reach the same cyclonic area of formation of Tyrrhenian depressions, although not related to the latter.
Source: https://en.wikipedia.org/wiki/Genoa_low
One effect not mentioned in this Wikipedia article is the strong north-westerly winds and the resulting swell in the western parts of the Med. This was the reason, why so many mainland Italian surfers and windsurfers had taken some extra days off (or had fallen sick) and had booked a ferry ticket to come to the Sinis peninsula.
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