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MetService heavy swell warnings were in place for the lower North Island coast, and strong wind watches for coastal parts of Wairarapa and the Tararua District, and in the South Island, coastal parts of Clutha and Dunedin from Tuesday

MetService is warning people to stay off the southern coastlines of the North Island during forecast large swells.

Cook Strait ferry sailings have been cancelled ahead of the swells expected to be more than seven metres.

A southerly weather system moving up the country is bringing the swells to Cook Strait from Monday evening through to Wednesday morning.