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The National Weather Service has extended a high-surf advisory for the north shores of Oahu, Niihau, Kauai, Maui, Molokai and Hawaii island effective until noon Tuesday.
A north-northwest swell is expected produce surf of 14 to 18 feet on Monday and 10 to 15 feet Tuesday morning.
The weather service warns ocean-goers to be aware of strong-breaking waves, shore break and strong currents that can make swimming dangerous.
