A tide warning has been issued for Sunday on the west and east coast, while a more serious flood warning is in place for Monday morning on the west coast.
Overnight Saturday, south-westerly winds turning into westerly winds are expected up to force nine, combining with a tide peaking at 9.2m at 6.31am on the west and east coast and again at 7.31pm on the west coast on Sunday.
Waves breaking over sea walls are expected to cause problems with water and debris affecting coast roads and walkways.
A Guernsey Met Office spokesman said the severe gales were tied in with a deep Atlantic depression, Storm Ciara, sweeping in from the west creating mild, wet and windy weather.
They added that there would perhaps be heavy rain on Sunday, which will clear into showers towards Monday.
Temperatures will be mild, at around 12C.
On Monday a 9.7m high tide will occur at 7.17am. A combination of these very windy conditions and high spring tides is expected to cause flooding in exposed low-lying coastal areas.
Drivers and pedestrians using coast roads and walkways are advised to take extreme care as conditions are likely to be hazardous.
Condor has cancelled Monday’s sailing of the Commodore Clipper.
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