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The National Weather Service has issued a high surf warning for the north- and west-facing shores of Niihau, Kauai, Oahu, and Molokai, and for the north-facing shores of Maui through 6 a.m. Friday.

A high surf advisory is up for the north-facing shores of the Big Island.

The current northwest swell is expected to peak Thursday night and then gradually subside by Friday.

Thursday wave heights on north and west shores of Kauai and the north-facing shores of Oahu, Molokai, and Maui will be 22-28 feet; west shores of Oahu and Molokai should be 15-20 feet.

Behind the current northwest swell, an even larger northwest swell is expected by Saturday and last through Sunday night.  The National Weather Service says the upcoming swell will likely require High Surf Warnings across the state.

With the large surf, expect strong breaking waves, shore break, and strong long shore and rip currents making swimming difficult and dangerous.

Large breaking surf, significant shore break, and dangerous currents make entering the water very hazardous.  Always heed lifeguard advice and know your limits. When in doubt, do not go out.

A Small Craft Advisory is also in effect for most of the Hawaiian Waters.  Seas will be 9-12 feet through Friday morning.